> Classifieds > > > 12AT7 / 12AU7 / 5963 /12AX7 Tubes

FOR SALE or TRADE: 12AT7 / 12AU7 / 5963 /12AX7 Tubes

Item #649339096
Info: 12AT7 / 12AU7 / 5963 /12AX7 Tubes

Asking Price:
CAD $60.00
Payment method: Cash, Paypal, Money Order, Money Wire, Interac/EMT
Condition: 9 - Excellent (?)
Date Posted: Nov 03, 18 7:11pm (PST)
Edited: Nov 09, 18 2:29pm
About Seller: David Dov
David Dov is a premium user
North York,Toronto, ON
Canada
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ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...

ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...
These 5963 tubes are usually very well matched (triode to triode) and noise-free.
Try them, you may like the results.
5963 + 5814 tubes (12AU7 variants) from $60.00 a matched pair while they last!
The highly recommended 5963 variant of 12AU7 tubes is an outstanding audiophile tube!
Try them in your amp/pre amps/headphone amps!!!
You will be impressed enough to buy another as a spare, and most likely not expect to continue searching for anything better.
Now is my favorite tube in my 12AU7-based collection of variant tubes!
It exemplifies "truth in timbre" and is very clean, sweet (but not artificially so), and neutral.
Inner voices and hall acoustics are easy to hear!
Just wait until you listen to all the types of 5963's.
It's another 12AU7A variant.
The 5963 IS A MEDIUM-MU TWIN TRIODE. 9—PIN MINIATURE TYPE
A variant of the 12AU7 family of tubes
Very little is written about these 5963 tubes.
It's practically today unknown, yet these are excellent fantastic replacements for 12AU7 tubes!
Smooth and sweet,yet bargain priced compared with many European brands!
Very smooth tube from top to bottom with no weakness!
These are a nice industrial/military upgrade variant type which is nearly identical to the standard 12AU7.
RCA made a nice black plate version of this tube
The 1950’s RCA 5963 sounds more dynamic than the standard 12AU7 Blackplate
It’s also a very good low-noise tube.
The plate voltage rating is a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be quite long lived, similar to the 5814.
That specially-designed cathode is said to withstand long periods of time in cut-off without damaging the tube (cathode poisoning).
This made them a great choice for NORAD computers, which led to a good supply of them on the USA West Coast.
Use them and you will marvel at the quality and value.
They are dead-silent and seem to have an unusually long lifespan.
Very satisfied with the sound they produce.
I prefer it to Mullard 12AU7, Sylvania 5814A,and of course the stock modern 12AU7's.
A truly fine 12AU7 variant from the 1950's, many tube audiophiles feel these can outperform most other NOS 12AU7 tubes!
In computer (and some other) service, tubes were quite often operated as switches, biased to cutoff (no plate current) for long periods of time and then turned on, while always the heater and cathode were warmed up and ready to go.
In ordinary tubes, this leads to a condition known as "cathode interface resistance" or "sleeping sickness."
The cathode interface is a layer of metal, usually nickel, between the cathode sleeve and the oxide coating that emits electrons. In ordinary tubes, under conditions of long-duration tube cutoff, it generates a growing resistance until at last the cathode "goes to sleep."
Computer tube cathodes were specially treated to survive those long periods of cutoff without developing cathode interface resistance

[PDF]5963
www.r-type.org/pdfs/5963.pdf

[PDF]5963
https://frank.pocnet.net/sheets/049/5/5963.pdf
A great article on using computer tubes like the 5963 for audio use:
http://www.effectrode.com/tubes-computer-applications/

5963 (12AU7 VARIANT)NEW OLD STOCK VINTAGE TUBES
MADE IN USA
BIG BOX ANODE PLATES
CLEAR GLASS TUBES
HALO GETTER
CLEAN SHINY PINS
G.E. / RCA 5963 BOXES AVAILABLE
ALL HAVE TESTED VERY STRONG ON MY B+K TUBE TESTER
NO GAS OR SHORTS

The 5963 tube is a nice industrial type which is nearly identical to the standard 12AU7.
G.E. ,RCA and Sylvania made very nice versions of this tube!
The plate voltage rating is just a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be long lived, similar to the 5814.
Watch this tube, as it is plentiful now and prices are low.
As audiophiles discover it, the rush will be on!

5963 + 5814 tubes (12AU7 variants) from $70.00 a matched pair while they last!


Also have singles and pairs of:

12BH7
12BY7
12AT6
12AV5
12BA6
12BE6
12AT7
12AV6
12AU7 Mullard tubes
5963
5814A
12AX7 Mullard tubes
5963 + 5814 tubes (12AU7 variants) from $50.00 a matched pair while they last!


All tested on a calibrated B+K tester
No gas or shorts.

All test results show min.:
100/115
and greater!

I have many 12AU7:
GE / ROGERS / RCA / MARCONI /SYLVANIA / WESTINGHOUSE
All test strong
No shorts or leaks!

12AU7 ECC82 Pre Amp Tubes

Being sold as matched pairs
Vintage pairs Sylvania branded 12AU7A

Made in Japan & USA tubes

All test very good on my calibrated B+K tester

All strong pairs with no gas or shorts!

12AU7 / ECC82 tubes
GENERAL ELECTRIC, ROGERS, SYLVANIA
MADE IN USA

Many matched pairs of: 12AU7A's
Many 12AU7's priced from

-G.E.
-Sylvania
Good linearity, smooth & slightly recessed upper mids/lower treble, good sub-bass extension
-Rogers
All have very warm, euphonic smooth sounding,with some amazing high end treble sparkle!


*Singles:
15 - 12AT7 ECC81
20 - 12AU7 ECC82


Many are NOS /NIB
ELECTROHOME / G.E. / ROGERS / RCA / MARCONI /SYLVANIA / WESTINGHOUSE
Short Grey Plates,some Black Plates, O-Getters
Perfect dynamics, very musical perfect balance!
Very good quality matching tubes, quiet nice warm superb sound,without any noise or hum!
All have been tested for shorts leaks and dynamic conductance
All have tested high on my B+K tube tester,and are in excellent condition!

TUBES TESTED ON MUTUAL CONDUCTANCE TUBE TESTER
ALL TUBES TESTED STRONG
NO SHORTS OR LEAKS

12AT7 / ECC81 tubes
GENERAL ELECTRIC
MADE IN USA

Very good, all are testing very good 100/110 (90 - 99%) well into the high end of green!

Mostly made in USA
All tubes have tested very good on my Calibrated B+K Tester with good readings of min. 85 - 115
All without any gas shorts

*Would also trade for 12AX7 tubes!
So this has left me with some to sell
or would trade for 12AX7's

Shipping anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!

Please pay by Canada Post money orders for all shipping orders
Bubble wrapped and boxed to ship each tube.
Payment is by:
Cash, Interac-EMT, Pay Pal (+ 4%)
Canada Post Money Orders

Cash on local GTA pickup

12AU7:
GE / ROGERS / RCA / MARCONI /SYLVANIA / WESTINGHOUSE
All test strong
No shorts or leaks!

12AU7 ECC82 Pre Amp Tubes

Being sold as matched pairs
Vintage pairs Sylvania branded 12AU7A

G.E. or Sylvania Tubes

Made in Japan & USA tubes

12AU7 / ECC82 tubes
GENERAL ELECTRIC, ROGERS, SYLVANIA
MADE IN USA

Many matched pairs of: 12AU7A's
Many 12AU7's

Good linearity, smooth & slightly recessed upper mids/lower treble, good sub-bass extension
All have very warm, euphonic smooth sounding,with some amazing high end treble sparkle


Many are NOS /NIB
ELECTROHOME / G.E. / ROGERS / RCA / MARCONI /SYLVANIA / WESTINGHOUSE
Short Grey Plates,some Black Plates, O-Getters
Perfect dynamics, very musical perfect balance!
Very good quality matching tubes, quiet nice warm superb sound,without any noise or hum!
All have been tested for shorts leaks and dynamic conductance
All have tested high on my Jackson 658A tube tester,and are in excellent condition!

TUBES TESTED ON MUTUAL CONDUCTANCE B+K TUBE TESTER
ALL TUBES TESTED STRONG
NO SHORTS OR LEAKS

12AT7 / ECC81 tubes
GENERAL ELECTRIC
MADE IN USA

Very good, all are testing very good 100/110 (90 - 99%) well into the high end of green!

Mostly made in USA
All tubes have tested very good on my Calibrated B+K Tester with good readings of min. 85 - 115
All without any gas shorts

*Would also trade for 12AX7 tubes!
So this has left me with some to sell
or would trade for 12AX7's

I have many ECC81 / 12AT7 / 6201 / 6414 tubes
Many are black plates
These are military spec. ECC81 / 6201 / 6414 / 12AT7 Variants
Also several are the harder to find rare triple mica
Very ultra-quiet low noise microphonics
Payable by Cash, EMT-Interac, Canada Post Money Grams
PayPal +4%
Buyer pays for shipping all orders under $159.99
Seller pays for shippping on all orders $160.00 or more!
I have much more then I need, given I'm now downsizing (seems to happen with us seniors....)
All test strong
No shorts or leaks!
Many singles,pairs,quads.
Priced to sell:
Please email for available brands + prices
I also have many other tubes to sell,so let me know what you need.
All tubes have tested very good on my Calibrated B+K Tester with good readings of min. 80 - 100
All without any gas shorts
I'm now selling off from my collection.
as I have much more then I need, given I'm downsizing (seems to happen with us seniors....)
Many are the much harder to find rare Triple mica Black plates....
All tubes have tested like new and very good on my Calibrated B+K Tester with good readings of min. 80 - 100
All without any gas shorts

*Would also trade for 12AX7 tubes!
Please email for list/prices.
Tubes will be properly bubble-wrapped and packed for safe shipping to you!
Shipping extra.
Local GTA pickup welcome.
Payment is by Cash,EMT, Canada Post Money Orders,Paypal +4%
Cash/Trades on local GTA pickup

On all orders over $160.00 Shipping is Free to anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!
Very well packaged for safe shipping
**Please read my CAM profile re: shipping + payment policies
*All sales final
No returns/refunds
*Would also trade for 12AX7 tubes!

Payment is by Cash, or EMT, Canada Post Money Orders on all shipping orders
Cash/Trades on local GTA pickup
All purchases for $160.00 or more include FREE SHIPPING anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!
Very well packaged for safe shipping
**Please read my CAM profile re: shipping + payment policies
*All sales final
No returns/refunds

ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...
These 5963 tubes are usually very well matched (triode to triode) and noise-free.
Try them, you may like the results.
The highly recommended 5963 variant of 12AU7 tubes is an outstanding audiophile tube!
Try them in your amp/pre amps/headphone amps!!!
You will be impressed enough to buy another as a spare, and most likely not expect to continue searching for anything better.
Now is my favorite tube in my 12AU7-based collection of variant tubes!
It exemplifies "truth in timbre" and is very clean, sweet (but not artificially so), and neutral.
Inner voices and hall acoustics are easy to hear!
Just wait until you listen to all the types of 5963's.
It's another 12AU7A variant.
The 5963 IS A MEDIUM-MU TWIN TRIODE. 9—PIN MINIATURE TYPE
A variant of the 12AU7 family of tubes
Very little is written about these 5963 tubes.
It's practically today unknown, yet these are excellent fantastic replacements for 12AU7 tubes!
Smooth and sweet,yet bargain priced compared with many European brands!
Very smooth tube from top to bottom with no weakness!
These are a nice industrial/military upgrade variant type which is nearly identical to the standard 12AU7.
RCA made a nice black plate version of this tube
The 1950’s RCA 5963 sounds more dynamic than the standard 12AU7 Blackplate
It’s also a very good low-noise tube.
The plate voltage rating is a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be quite long lived, similar to the 5814.
That specially-designed cathode is said to withstand long periods of time in cut-off without damaging the tube (cathode poisoning).
This made them a great choice for NORAD computers, which led to a good supply of them on the USA West Coast.
Use them and you will marvel at the quality and value.
They are dead-silent and seem to have an unusually long lifespan.
Very satisfied with the sound they produce.
I prefer it to Mullard 12AU7, Sylvania 5814A,and of course the stock modern 12AU7's.
A truly fine 12AU7 variant from the 1950's, many tube audiophiles feel these can outperform most other NOS 12AU7 tubes!
In computer (and some other) service, tubes were quite often operated as switches, biased to cutoff (no plate current) for long periods of time and then turned on, while always the heater and cathode were warmed up and ready to go.
In ordinary tubes, this leads to a condition known as "cathode interface resistance" or "sleeping sickness."
The cathode interface is a layer of metal, usually nickel, between the cathode sleeve and the oxide coating that emits electrons. In ordinary tubes, under conditions of long-duration tube cutoff, it generates a growing resistance until at last the cathode "goes to sleep."
Computer tube cathodes were specially treated to survive those long periods of cutoff without developing cathode interface resistance

[PDF]5963
www.r-type.org/pdfs/5963.pdf

[PDF]5963
https://frank.pocnet.net/sheets/049/5/5963.pdf
A great article on using computer tubes like the 5963 for audio use:
http://www.effectrode.com/tubes-computer-applications/

5963 (12AU7 VARIANT)NEW OLD STOCK VINTAGE TUBES
MADE IN USA
BIG BOX ANODE PLATES
CLEAR GLASS TUBES
HALO GETTER
CLEAN SHINY PINS
G.E. / RCA 5963 BOXES AVAILABLE
ALL HAVE TESTED VERY STRONG ON MY B+K TUBE TESTER
NO GAS OR SHORTS

The 5963 tube is a nice industrial type which is nearly identical to the standard 12AU7.
G.E. ,RCA and Sylvania made very nice versions of this tube!
The plate voltage rating is just a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be long lived, similar to the 5814.
Watch this tube, as it is plentiful now and prices are low.
As audiophiles discover it, the rush will be on!

5963 + 5814 tubes (12AU7 variants) from $70.00 a matched pair while they last!
I have many ECC81 / 12AT7 / 6201 / 6414 tubes
Many are black plates
These are military spec. ECC81 / 6201 / 6414 / 12AT7 Variants
Also several are the harder to find rare triple mica
Very ultra-quiet low noise microphonics
Payable by Cash, EMT-Interac, Canada Post Money Grams
PayPal +4%
Buyer pays for shipping all orders under $159.99
Seller pays for shippping on all orders $160.00 or more!
I have much more then I need, given I'm now downsizing (seems to happen with us seniors....)
All test strong
No shorts or leaks!
Many singles,pairs,quads.
Priced to sell:
Please email for available brands + prices
I also have many other tubes to sell,so let me know what you need.
All tubes have tested very good on my Calibrated B+K Tester with good readings of min. 80 - 100
All without any gas shorts
I'm now selling off from my collection.
as I have much more then I need, given I'm downsizing (seems to happen with us seniors....)
Many are the much harder to find rare Triple mica Black plates....
All tubes have tested like new and very good on my Calibrated B+K Tester with good readings of min. 80 - 100
All without any gas shorts

*Would also trade for 12AX7 tubes!
Please email for list/prices.
Tubes will be properly bubble-wrapped and packed for safe shipping to you!
Shipping extra.
Local GTA pickup welcome.
Payment is by Cash,EMT, Canada Post Money Orders,Paypal +4%
Cash/Trades on local GTA pickup

On all orders over $160.00 Shipping is Free to anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!
Very well packaged for safe shipping
**Please read my CAM profile re: shipping + payment policies
*All sales final
No returns/refunds
*Would also trade for 12AX7 tubes!

Payment is by Cash, or EMT, Canada Post Money Orders on all shipping orders
Cash/Trades on local GTA pickup
All purchases for $160.00 or more include FREE SHIPPING anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!
Very well packaged for safe shipping
**Please read my CAM profile re: shipping + payment policies
*All sales final
No returns/refunds
Shipping anywhere in Canada!
Each shipped tube is bubble wrapped and well boxed!

Please pay by Canada Post money orders for all shipping orders
Bubble wrapped and boxed to ship each tube.

Payment is by Interac-EMT, Cash,Canada Post Money Orders only on all shipping orders

Cash/Trades on local GTA pickup

*Please read my CAM profile re: shipping policies

**No returns/refunds


Additional Information:

Mar 24, 18 3:50am
ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...
These 5963 tubes are usually very well matched (triode to triode) and noise-free.
Try them, you may like the results.
The highly recommended 5963 variant of 12AU7 tubes is an outstanding audiophile tube!
Try them in your amp/pre amps/headphone amps!!!
You will be impressed enough to buy another as a spare, and most likely not expect to continue searching for anything better.
Now is my favorite tube in my 12AU7-based collection of variant tubes!
It exemplifies "truth in timbre" and is very clean, sweet (but not artificially so), and neutral.
Inner voices and hall acoustics are easy to hear!
Just wait until you listen to all the types of 5963's.
It's another 12AU7A variant.
The 5963 IS A MEDIUM-MU TWIN TRIODE. 9—PIN MINIATURE TYPE
A variant of the 12AU7 family of tubes
Very little is written about these 5963 tubes.
It's practically today unknown, yet these are excellent fantastic replacements for 12AU7 tubes!
Smooth and sweet,yet bargain priced compared with many European brands!
Very smooth tube from top to bottom with no weakness!
These are a nice industrial/military upgrade variant type which is nearly identical to the standard 12AU7.
RCA made a nice black plate version of this tube
The 1950’s RCA 5963 sounds more dynamic than the standard 12AU7 Blackplate
It’s also a very good low-noise tube.
The plate voltage rating is a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be quite long lived, similar to the 5814.
That specially-designed cathode is said to withstand long periods of time in cut-off without damaging the tube (cathode poisoning).
This made them a great choice for NORAD computers, which led to a good supply of them on the USA West Coast.
Use them and you will marvel at the quality and value.
They are dead-silent and seem to have an unusually long lifespan.
Very satisfied with the sound they produce.
I prefer it to Mullard 12AU7, Sylvania 5814A,and of course the stock modern 12AU7's.
A truly fine 12AU7 variant from the 1950's, many tube audiophiles feel these can outperform most other NOS 12AU7 tubes!
In computer (and some other) service, tubes were quite often operated as switches, biased to cutoff (no plate current) for long periods of time and then turned on, while always the heater and cathode were warmed up and ready to go.
In ordinary tubes, this leads to a condition known as "cathode interface resistance" or "sleeping sickness."
The cathode interface is a layer of metal, usually nickel, between the cathode sleeve and the oxide coating that emits electrons. In ordinary tubes, under conditions of long-duration tube cutoff, it generates a growing resistance until at last the cathode "goes to sleep."
Computer tube cathodes were specially treated to survive those long periods of cutoff without developing cathode interface resistance

[PDF]5963
www.r-type.org/pdfs/5963.pdf

[PDF]5963
https://frank.pocnet.net/sheets/049/5/5963.pdf
A great article on using computer tubes like the 5963 for audio use:
http://www.effectrode.com/tubes-computer-applications/

5963 (12AU7 VARIANT)NEW OLD STOCK VINTAGE TUBES
MADE IN USA
BIG BOX ANODE PLATES
CLEAR GLASS TUBES
HALO GETTER
CLEAN SHINY PINS
G.E. / RCA 5963 BOXES AVAILABLE
ALL HAVE TESTED VERY STRONG ON MY B+K TUBE TESTER
NO GAS OR SHORTS

The 5963 tube is a nice industrial type which is nearly identical to the standard 12AU7.
G.E. ,RCA and Sylvania made very nice versions of this tube!
The plate voltage rating is just a little lower than for a 12AU7, but for most applications, it will work fine.
It has a rugged cathode and should be long lived, similar to the 5814.
Watch this tube, as it is plentiful now and prices are low.
As audiophiles discover it, the rush will be on!

5963 + 5814 tubes (12AU7 variants) from $70.00 a matched pair while they last!

Mar 24, 18 3:53am

Mar 29, 18 4:48pm
Also have some assorted brands of very good tested strong 12AX7 Tubes
Around 40 tested slightly used tubes @ $25.00 each, or $40.00/pair

They are mostly singles + some pairs of different brands:
G.E. / JJ's / Marconi / Philips / RCA / Electro-Harmonix, Sovtek / Sylvania / Westinghouse
Also some Chinese 12AX7 WA + WB

Shipped to anywhere in Canada for $18.00 (1-4 tube pkg)
*Free shipping on any orders of $160.00 or more!

Apr 17, 18 9:28am
Selling vintage 1960's single 5963 tubes
NOS (New old stock)
All were made in USA

No leaks or shorts
$50.00 each tube

Also have some very RARE NOS/NIB 6E5 General Electric tuning magic eye tubes
6E5 = VT-215 = 6Z-6E5 = UZ-6E5 = 6E5_Japan = CV1906
G.E. + WESTINGHOUSE TUBES Condition: NOS/NIB Never used!
Description:
Tube Type / Number: 6E5
Actual Brand*: G.E.
Quantity of Tubes: 6
Country of Manufacture: Canada
Year Made: Sept 1963
5960.21.100.3434
Lettering Condition: 80%
Plate Construction: Silver Ribbed
Getter Construction: Bottom
Number of Mica Spacers: 2
Mica Shape: U
Clear Glass
Engraved Base
(NIB) Original Boxes Included
$25.00 each or trade?

A Look At A NOS 6E5 Magic Eye Tube - YouTube
Video for 6e5 magic eye tube
▶ 14:37
https://www.youtube.com/watch?v=kgm6Kwi24KA



*Also have several 35W4 and 35Z5 GT half Wave Rectifier Tubes @ $12.00 each or trade ???

35Z5GT/G @ The Valve Museum
www.r-type.org/exhib/aaa0889.htm

Shipping to anywhere in Canada is $12.00 for each pair
Payable by: Cash,EMT, Paypal +4%

Jul 22, 18 10:02am
Selling off some more of my tube collection of 50 years!
This ad is for the very desirable triple mica version G.E. 5814A tubes
Made in USA
These are an excellent upgrade variant for 12AU7 tubes,
The 5814A is equivalent to a 12AU7WA, it is ruggedized and redesigned
The filament current raised to 175ma per section versus 150ma per section for a 12AU7.
5814A are computer rated, 5814WA is ruggedized
Medium mu twin triode; high-rel, computer-rated variant of 12AU7, as indicated by A suffix; increased heater current.
Base: Noval, B9A
Filament: Vf 12.6 Volts / If 0.175 Ampere / Indirect / Parallel / series AC/DC
All 12AU7 tubes are rated Vhk=200V, 5814A tubes are rated Vhk=100V.
All tubes tested very strong on my B+K tester
Tubes all showed teat results between 2300 - 2450 where minimum on this tubes is 1175.
Brand new tubes usually measure around 2200.
No leaks or shorts.
Tubes are matched with 5% or less!
$90.00 a matched pair.

Also have Branded Baldwin organ grade 12au7 white and yellow print organ grade very musical tubes!
All have been tested with a B+K calibrated tube tester
Baldwin organ grade vacuum tubes
$60 a pair
$90 a quad
White stamped labels
All tested and fully operational.
Super Strong!.
Including shipping to anywhere in Canada

The 12AU7 is a miniature medium-mu twin triode.
This tube finds use as a phase-inverter/splitter in push-pull amplifier circuits in ac/dc radio equipment and in many diversified applications such as multivibrators or oscillators in industrial control devices.
The tube is quite pokey and sections can even be connected in parallel to create a power amp with enough current to drive a pair of headphones or even a guitar speaker.
A centre tapped heater permits operation of the tube from a 6.3V or a 12.6V heater supply.
The tube requires a noval nine-contact socket and may be mounted in any position.

DOUBLE TRIODE (separate cathodes)
Heater Voltage 6.3-12 V
Heater Current 300-150 mA
Plate Voltage 250 V
Plate Current 10.5 mA
Plate Resistance 7700 Ω
Amplification Factor (μ) 20
Plate Dissipation (max) 2.75 W
B9A pinout

Also have many top of the line variants 12AU7 / ECC82 tubes
5814A / 6680 / 6189 /6189 / 5963 tubes are all an upgrade/military grade variants of 12AU7's
G.E / Heathkit / RCA / JAN ROGERS / TUNG-SOL / WESTINGHOUSE
All test very strong
No shorts or gas leaks!
Price is $60.00 a matched pair!
Shipping to anywhere in Canada is available
Tubes are bubble wrapped and securely well packaged for shipping!
Payment is only by;EMT Interac money transfers, Cash,Canada Post money gram/orders


ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...


Also clearing out many assorted brands of vintage 1950 -60's
ECC82 / 12AU7 + ECC83 / 12AX7 ECC81 / 12AT7 tubes
Black + Grey Long/Short Plates are available
Mostly are G.E. / Marconi / Raytheon / RCA / Sylvania / Westinghouse
Both short or long grey + black plates are available.
Test strong like new with very closely matched sections.
All have had very little use.
Lettering and logo prints are all excellent!
All these vintage tubes still do test very strong, like new /very close!
All tubes have been tested twice on my mutual conductance calibrated B+K tester
They will test at or close to new.
No gas leaks or shorts.
Each shipped tube is bubble wrapped and well boxed!
Price is @ $60.00 per matched pair !
Cash, EMT, Canada Post Money orders preferred
PayPal + 4%
1-4 tubes are the same $19.00 shipping cost by Canada Post regular parcel service at buyer's expense
*All orders of $160.00 or more will be shipped Free to anywhere in Canada!


Local GTA pickup also welcomed.
Shipping is by Canada Post regular parcel,
Usually shipping cost is $18.00 per shipment anywhere in Canada.
Keep in mind that 1 - 4 tubes being shipped is the same cost as shipping only a single tube.
All tubes will be properly well bubble wrapped and packaged to ensure safe arrival to you!
Accepted payment is by; Cash/EMT/Canada Post money gram or orders
**FREE Shipping on all orders over $160.00

*As shipping costs to anywhere in Canada is $18.00 (for 1 - 4 tubes)
USD are higher in the United States, shipping is available to USA buyers at their expense,
which usually is $24.00 (for 1 - 4 tubes) to anywhere in the Continental USA

Will bubble wrap and pack most securely for safe arrival
Cash GTA Toronto pick-up is always welcome!
Cash/EMT/Canada Post or Bank money orders
If Paypal +4%

Please see my other ads
Thanks for looking!

ATTENTION all CAM member tube shoppers...
Finding the right tube for your amp/pre amp,you will find that there will be a lot of different opinions ....
Many times all the answers are right.
The complications can be is some tubes can be very system dependent so it will depend on your system as to which tubes sound the best.
We all desire quiet nice sounding tubes.
Why are some tubes noisier then others,or quieter in certain amps and not in others?
Audio tubes need to settle in and then will get better once burned in.
Definitely buy from a reputable dealers!
If you're going to be into tubes, its always beneficial to develop a relationship with dealers you can trust.
If you want to find the best sounding tube for your system and don't mind spending $$, then buy several brands/types and listen for yourself.
Each brand tends to feature characteristics that may appeal to you and match well with your unit, others not so much so there really isn't one 'best-sounding' tube out there as its very dependent on the application.
Also, while these super rare and uber-expensive tubes do sound great, they're best implementation is in sensitive pre amps and phono stages Remember, a good portion of their cost can be attributed to their scarcity, not just their sonics.
They really don't stand out in the usual amplifier's driver stage and in most other gear, a similar but substantially more common NOS tube of the same manufacturer will provide all but maybe the last 1% of the sonics of the super tubes at a much lower price.
Although improving, still many of the new tubes made today in Europe, China and Russia only reproduce random varied harmonics.
This can be why most of us upgrades to a vintage made tube made decades ago when these rare inner earth metals were available in the inside construction of the vintage tube.
These metals have become too expensive to use and today’s tube makers have found cheaper substitutes which seem to work but do not reproduce all the nuances and textures in music! ...






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