FOR SALE or TRADE: 12AT7 / 6201,12BH7, 12BY7 / EL180 tubes
Item #649312322Info: 12AT7 / 6201,12BH7, 12BY7 / EL180 tubes
||Cash, Money Order, Money Wire, Interac/EMT
||8 - Very good (?)
May 14, 17 7:17am (PST)
North York,Toronto, ON
[other classified ads]
488 See details
100% Positive Feedback
|Days in System:||157|
Sponsored post - log in to remove this ad.
6CG7 (singles only no more matched pairs)
All tubes @ $40.00 a pair
Tubes tested on a rebuilt, recently calibrated B&K tube tester.
Most tubes are NOS and test very strong with no leaks or shorts.
1-4 tubes are the same shipping cost which is by Canada Post regular parcel service,
and is usually $18.00 to anywhere in Canada.
Minimum shipping order is $40.00
Any purchase over $150.00 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/orders
Thank you for looking!
Nov 16, 16 9:20pm
Tubes tested in order of my personal favorites
RCA Clear Tops
1960's Sylvania's with the Yellow lettering (the green lettering is from the 1950's and is supposed to be better sounding but they are hard to come by)
Smooth clean sound with great depth and presence to the music with excellent well controlled tight bass,
clear clean treble and timbre (cymbals sounded very natural with good decay and the leading edge of piano notes was smooth with no ring) and a very sweet midrange.
They lean to the slightly warmer side of neutral. Good sound stage,
average to above average air and transparency when used in my DAC with the RCA Clear tops in my Preamp.
I think that they present less air because of the depth of the music which really has a live sound to it.
RCA Clear Tops-
Strengths are very wide sound stage with tremendous air and transparency.
Good bass and well balanced sound but they tend to lean on the brighter side of neutral
They pair well with other tubes and do well in a DAC and Pre amp.
When I used the RCA's paired together in my Pre the sound stage appeared almost infinite and the music was the most transparent.
Treble seems to have less resolution but it was pleasing.
I really love the sound stage, air and transparency. With certain music and listening in the dark
the sound can be mesmerizing.
If the sound was only a little warmer with less sibilance this would be may favorite combination.
And at times I may switch back and forth with the Amperex tubes in my DAC or Pre.
These tubes could have ranked up there with the Amperex as they have excellent bass and midrange with a very smooth,
liquid sound with good depth and realism but treble was slightly pushed back for my taste.
They present a good sound stage but only average air and transparency.
They would be a great choice if you like to listen to Rock and roll and older brightly recorded Cd's.
They sounded equally good in both my DAC and Pre when paired with the RCA's.
These tubes really are a funky tube.
They do best in the DAC and need careful matching with other tubes.
When used in my Pre they have too much bass and it seems too loose.
But in my DAC they are warm and smooth sounding with a very natural sound,
however they seem to lack bass when paired with the RCA's in the Pre.
(note that I had upgraded to the Burr Brown Op Amps in my DAC for a while and the Mazda's had excellent bass in the DAC and boomy bass in the Pre,
I have since removed the BB Op Amps and put back in the stock OA's.).
The Mazda's would be great in my system if I used a sub.
These tubes have a very neutral sound.
They have very good resolution other than that they are average in all area's.
I could live with these tubes but there are better out there.
They seem more suited for my DAC.
In my Pre the bass was just a little loose sounding with bass heavy music.
Good overall sound as these were the stock tubes in both my DAC and Pre amp
Where do I start!
These are supposed to be exact copies of the RCA Clear tops but they sure don't sound like it!
They had no sonically redeeming qualities in my system.
They were way too bright with irritating sharp harsh treble and they lacked bass!
Vocals sounded less natural and the mid range sounded dead.
I hope this helps some, however I accept every one has different equipment and tastes.
12AU7 / 12BH7 / 6CG7: What's best?
The 12AU7, 12BH7, and 6CG7 have very similar electrical characteristics and can usually be substituted for each other.
When deciding what tubes are best for you, the following notes may be helpful:
(1) A 12AU7 is identical to a 6CG7 electrically and in the circuit it will function identically.
However, there is a different heater pin out. So if you are substituting you need to make a change.
In addition, the 6CG7 draws twice as much heater current so be sure that this will work in your circuit.
(This may be one reason it is not as popular as it should be.)
(2) The 12BH7 requires no circuit modification to substitute for a 12AU7,
but the plate resistance is a little lower (5300 vs 7700).
Thus, even though it has a lower u (or amplification factor), the gain may be slightly higher depending on the circuit design.
[This is mainly true for circuits that use an anode resistor load.]
It will also draw a little more current, but the 12BH7 is a beefier tube and can handle it.
For most circuits this should be well within the tolerances of the design, but you can ask the manufacturer to be sure.
With respect to audio reproduction there is a fairly large difference between these three tubes.
The 6CG7 (or 6FQ7 which is the same exact tube) is identical in internal construction to the 6SN7.
The 6SN7 has the reputation of being the most linear of the medium mu triodes and the 6CG7 follows suit.
Also, the 6CG7 line is remarkably similar in audio performance across various manufacturers of the same vintage or age.
It is a good tube for early or middle stage amplification and has the added bonus of a grounded shield between sections,
which reduces hum and increases channel separation.
The 12BH7 can lend a wonderful life to the tone that sounds great for jazz or vocals.
For audio listening, this tube can temper the harshness of CD's.
There is, however, a wider variation in the sound of 12BH7s than 6CG7s, so some tube selection or rolling is in order.
You can find very neutral 12BH7s (watch for a coming blog comparing them) .
If you don't want to modify the circuit and are unhappy with your 12AU7--this is a good choice.
The 12AU7 family has the widest variety of tonal characteristics which is probably why this tube is rolled so often by audiophiles.
Personally find most 12AU7s a little tinny in comparison with the 12BH7 and 6CG7, yet there are exceptions.
The RCA clear plates from the 60s are more like 6CG7s in their sound, for example.
There are lots of blogs and posts about the difference between 12AU7's so I won't waste your time repeating everything.
My favorites are Mullard and Siemens, with RCA clear tops and Tung Sol a close second.
A lot of us like Amperex, however they work best in a system that is not forward or bright as they add life to the mid range.
Part of the fun and magic of tubes is rolling them when listening to different types of music
Canuck Audio Mart is FREE!