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Old 16th April 2008, 04:51 PM   #1
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Default Best/favorite CF NOS noval twin triode?

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.
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Old 16th April 2008, 04:56 PM   #2
SY is offline SY  United States
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The figure of merit is gm, but you also have to consider desired drive current- a tube with 1mA of plate current won't drive a 1k load very well no matter how high the gm. For general purpose applications, it's tough to do significantly better than the ECC88 if you're limited to a dual package.
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Old 16th April 2008, 05:25 PM   #3
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That leaves the 8416 -- it is a 6dj8 with a 12.6V heater, which means it is pin compatible with the 12au7 with the exception that the heater has no center tap. So you have to use 12.6V to heat it.
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Old 16th April 2008, 05:34 PM   #4
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Shhhh! We don't talk about that tube!
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Old 16th April 2008, 05:37 PM   #5
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Oops, sorry. I forgot.

For what it's worth, I don't know that anyone is making 6N6p's anymore. they are NOS, just not US or EU made NOS.
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Old 16th April 2008, 05:40 PM   #6
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12BH7?

ok - not exactly a high transconductance tube.
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Old 16th April 2008, 05:47 PM   #7
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How about a 6DT8 or 12DT8. mu = 60, Gm=5500, and they are like $3 each.
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Old 17th April 2008, 08:29 AM   #8
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Hi Stuart,

Quote:
Originally posted by SY
For general purpose applications, it's tough to do significantly better than the ECC88 if you're limited to a dual package.
Indeed.

If more Pa and/or more Ia and/or more Ea-k is necessary than ECC88 could stand, the noval dual triode ECC99 might be of interest.



Regards,

Tom
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Old 17th April 2008, 09:28 AM   #9
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Good moring,
I recommend the ECC83 12AX7.

Kind regards,
Darius
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Old 17th April 2008, 10:01 AM   #10
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Hi,

Totem pole an ECC88 into a White CF and drive nails.

This modified White CF (mWCF) has an output Z of 100 ohms
(though repeatedly with various brands, it's about 120 ohms)

You heard it last year at Dave's I believe (back porch).

Cheers!
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