FOR SALE or TRADE: Looking to sell / trade vintage tubes
Item #649406424Info: Looking to sell / trade vintage tubes
||Cash, Paypal, Money Order, Money Wire, Interac/EMT
||8 - Very good (?)
Jan 12, 18 7:00pm (PST)
Edited: Jan 28, 18 7:29pm
North York,Toronto, ON
[other classified ads]
607 See details
100% Positive Feedback
|Days in System:||164|
Sponsored post - log in to remove this ad.
Tubes I have to trade with:
10CV/2980 ( eye")
6E5 (magic eye)
6CY5 / 7717
12AT7 / ECC81
12AU7 / ECC82
12BY7 / EL180
6J6 / ECC91 / 6N15P RUSSIAN NOS
JAN 0C3 VR105 NOS
6AQ8 / ECC85
Tubes I could accept in trade:
6BQ5 / EL84 / 7189
Will trade singles to multiples for fair trades
Selling from $20.00 each
Jan 15, 18 10:27am
*Also have (4) 6SL7 tubes available
Also have some Rogers 2 x 6L6 / 4 x 6SL7
+ 2 x Marconi 6SN7 tubes
Pairs of 6SN7 + 6SL7 tubes:
The 6SL7 could be regarded as the high mu companion to the medium mu 6SN7.
Like the 6SN7 it became quite popular during the 1990's among audio amplifier builders.
It went through a similar popularity cycle as the 6SN7.
After being overused and often in applications for which it is not well suited, it went a bit of fashion.
It shares the same octal base and pinout with the 6SN7.
To some tube rollers this made it seem compatible and it was often tried as an alternative to get more gain.
While the 6SL7 might work in some circuits designed for the 6SN7 and provide a bit higher gain, it really is a different animal and should only be used in circuits which are designed for it. The heater operates at the same 6.3V as the 6SN7 but at only half the current (300mA).
As mentioned above it is a high mu triode with an amplification factor of 70 vs the 20 of the 6SN7.
But that high amplification factor comes at a cost.
The 6SL7 has a plate resistance of 44kOhms which is more than 6 times higher than the rp of the 6SN7.
It also operates at a lower current, typically around 2ma.
For complete technical data please see the data sheet.
This high plate resistance which comes with a rather low trans conductance probably is the reason why it lost popularity a bit when higher trans conductance tubes became more fashionable.
But this does not make it a bad tube.
If the circuit is designed for it's parameters it is a great performer and it works well in unison with the 6SN7.
For example as first stage in a phono preamplifier.
Correctly implemented the 6SL7 gives a nice warm and smooth sound.
As it does for example in my Octal Preamplifier Mk1.
The 6SL7 has also been used as driver tube for small triodes like the 45 or 71A.
With both sections wired in parallel to halve the plate resistance this can work well and offer the possibility to build a simple two stage amplifier.
Wouldn't use it for larger triodes though.
Would prefer it in small signal applications like phono stages.
The reason for it's deserved popularity in the 1990's was it's good linearity:
Jan 28, 18 7:29pm
Several 12AT7 ECC81 Black Plate tubes for sale or trade.....
Some of nicest sounding 12AT7 tubes every made and with their strong construction will continue to sound great for a very long time.
Tube shows the trademark which has acid etched codes so you know it's are for real.
This tube is in excellent condition and has never been used!
Military grade tubes are built sturdier than non-military types.
Some of the last ones left, these are great sounding tubes with that old British heritage.
Superb sonics and balanced sections make this an ideal upgrade replacement tube for Fender amps, vintage and current hi-fi amps and boutique guitar amps.
Super durable with long life.
Amazing sound, deep bass and articulated highs with that famous Mullard Sweetness and warmth!
It's probably one of the most misunderstood things about vacuum tubes:
The name on the tube is the company that made it right?
Well actually the answer is No - and that's why it can be so confusing.
The tube making giants of the 1940's, 50's and 60's were:
Amperex / GE ( General Electric) Mullard / Philips / RCA / Sylvania / Westinghouse to name some but certainly not all.
While it's true that they made tubes with their company name on the glass - the bulk of their production was devoted to making tubes under contract for other companies.
Remember the Zenith TV your family had in the living room back in the 70's?
All the tubes inside were labelled Zenith and Only Replace with Genuine Zenith Tubes.
Brilliant marketing but somewhat deceiving since Zenith didn't make tubes.
They bought them in bulk from GE and Sylvania and the supply contracts required that the tubes were labelled Zenith.
The public didn't know that - it made sense to replace a Zenith tube with a Zenith tube. Zenith knew that other brands could be used instead but they were protecting their repeat business.
This is just one example - multiply it by the 100's of other companies making TV's, organs, radio receivers, amplifiers, medical / test equipment and you can see how confusing this became.
All those different names on the glass but still only a handful of companies making tubes.
So how do you know who made a tube?
Learn to read the production codes - not the brand names.
Each tube will have markings which show two things - the company that made it and when it was made.
Once you learn these codes it makes tube identification easy and allows you to find good deals. There are a lot of good resources on the web that will teach you about production / date codes
Also have several 12AX7 tubes made by Philips Amperex: some labelled for Rogers or Electrohome and the 1st one as an Amperex Bugle Boy. Guess what?
They all sound the same. Why?
Because they were made on the same assembly line, using the same materials and method of construction and with the same testing afterwards. If Amperex made the tube it's going to sound like an Amperex tube.
Just like scotch tastes like scotch regardless if it was packaged in the familiar bottles or a glass mason jar.
The only difference is the tube on the far left will sell for double the price - because it has the Bugle Boy logo. We've been brought up to think that the label on the outside is the most important factor and that simply isn't the case.
The label means nothing - who made the tube is what your ears hear.
The Philips Amperex Mullards 12AX7 that have someone else's name branded on the glass such as Electrohome, but still will give you all the great sound you'd expect from these companies.
Thanks for your time - hope you've found this helpful!
Tubes tested on a rebuilt, recently calibrated B&K tube tester.
All tubes are NOS/NIB and test as such with no leaks or shorts.
1-4 tubes are the same shipping cost which is by Canada Post regular parcel service,
and is usually $15.00 to anywhere in Canada.
Minimum order is $50.00 or more
Any purchase over $160.00 and shipping is on me!
All tubes will be very well packed and wrapped with bubble wrap!
Local GTA pickup also welcome.
Accepted payment is by; Cash/EMT/Canada Post money gram or orders
Thanks for looking.
Canuck Audio Mart is FREE!