[HomeBrew] Octal equiv. of 12AU7?

Mon, 7 Jul 2003 18:24:51 -0700 (PDT)

Hi Dick and Co:
This is what I'm going to do: I intend to adapt an EF Johnson time sequenced keyer circuit to a Lysco Transmaster CW transmitter. Since I have a surplus of both the 6SN7's and octal tubes, plus making the mod look "balanced" to the other octal tubes in the rig, that is the motivation for going octal. Guys, let me know what you think. Thanks. Cal, N6KYR. 

Dick Foster <[email protected]> wrote:
The 6SN7 is equivalent to a 12AU7 in that it is a medium-mu dual triode.
The 6SN7 of course only takes 6.3v on the filament and at a higher current,
0.6A. My listing doesn't show the plate dissipation. As a resistance
coupled amplifier, I think the 6SN7 would do the job, especially at audio
frequencies. The 12AU7 might do better in RF applications, especially at
VHF.

Pinouts for 6SN7: 1-GT2, 2-PT2, 3-KT2, 4-GT1, 5-PT1, 6-KT1, 7 & 8 are
filaments.

The 6SL7 is another dual triode, but its High-Mu. Would probably do the job
in a lot of applications. The pinouts are the same.

A 6SQ7 is a single triode with dual diodes typically used as detector, AVC
and first audio.

What are you brewing? Motivation for going octal cosmetic?

Dick W5TA

----- Original Message ----- 
From: "kwylow zinjanthropus" 
To: 
Sent: Monday, July 07, 2003 5:57 PM
Subject: [HomeBrew] Octal equiv. of 12AU7?

> ** Please do NOT cross-post messages to multiple mailing lists on the
"To:" or "CC:" line of the e-mail message. **
>
> Does anyone know what the octal tube equivalent of a 12AU7 tube is? I
suspect it is one of the 6S*7 series (6SQ7, 6SN7, etc). Let me know and
thanks. Cal, N6KYR.
>
>
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