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Best/favorite CF NOS noval twin triode?
Best/favorite CF NOS noval twin triode?
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Old 18th April 2008, 03:17 PM   #31
kevinkr is offline kevinkr  United States
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Best/favorite CF NOS noval twin triode?
Quote:
Originally posted by oldeurope



BTW: Did you read post #1 ?

D.

Yep, right from the very beginning. Just because he commented that he knew about the 5687 wasn't necessarily going to prevent me from promoting that choice.

BTW I am not a tube dealer either, at this point no more than a hobbyist really, although I do hawk my old books still which incidentally do feature a lot of 12AX7A based circuits.

I used to supply small quantities of tubes to my old clients, and some casual buyers, but the current pricing regimen at my wholesale supplier makes it impossible to compete on price so I no longer sell any tubes at all.
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Old 18th April 2008, 04:27 PM   #32
oldeurope is offline oldeurope  Germany
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Quote:
Originally #1 posted by leadbelly
What I am looking for is a recommended NOS twin triode in the "standard" noval pinout (12AU7 etc.) for a cathode follower.

I know about the standard forum recommended 6N6P (not NOS) and 5687 (different pinout). I know 12AU7 is often called an "OK" CF tube but I was wondering if there was something better. Larger heater draw or different voltage is no problem.
Hello leadbelly,
please tell me the signal voltage level and the load resistance.
Line level? Is it used to drive a 50KΩ input?
In this case the ECC83 and similar tubes are the best. ...


Kind regards,
Darius
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Old 19th April 2008, 01:44 PM   #33
Shoog is offline Shoog
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Quote:
In this case the ECC83 and similar tubes are the best. ...
You seem to be a headbanger

Adequate maybe, but certainly not best.

Shoog
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Old 19th April 2008, 03:45 PM   #34
oldeurope is offline oldeurope  Germany
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Quote:
Originally '33 posted by Shoog


You seem to be a headbanger

Adequate maybe, but certainly not best.

Shoog
Hi Shoog,
show me a better one, if you can.
Load 50KΩ max output line level.
Kind regards,
Darius
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Old 19th April 2008, 04:37 PM   #35
oldeurope is offline oldeurope  Germany
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Default How to find the best ...

Cathode follower means that the signal voltage at the
cathode follows the signal voltage at the grid.
A perfect cathode follower does this job exactly,
means gain = 1.
A triode cathode follower with unity gain makes no distortion.
Thus try to find one that is as close as possible to
unity gain.
The gain of a cathode follower is simplified calculated in the following way:

vu = (11/) x (r(r+1/s))

vu: [this is the voltage gain of the cathode follower]
(11/): [open output gain]
r(r+1/s): [gain reduce caused by load]
s: [transconductance]
r: [small signal load resistance at cathode]

link cathode follower gain
link asymmetrical cathode coupled stage gain calc. example
hope it helps.

Kind regards,
Darius

edit: links added
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