[Milsurplus] TCS Crystal oscillator tube sub

[AKLDGUY .]

Done some checking.
The 12V6-GT is a pin-for-pin plug-in for the 12A6 and has quite low
heater requirement at 0.225 Amp, which might make balancing a little
easier or less critical.

73 de Neil ZL1ANM


On 2/13/16, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> Crapola! :-(
>
> I made a big mistake!
>
> Scratch the 6K6 or 6F6: the suppressor is connected internally to the
> cathode, which will NOT work in this circuit since the cathode is part of
> the
> feed-back circuitry. The suppressor would bypass the shielding of the
> screen. Wouldn't work much better than a beam tube.
>
> At this point, I would use a pair of 6AG7s, 6AK7s, 6CL6s, or 12BY7s, socket
>
> adapters, and balancing resistors in the oscillator and buffer sockets.
>
> Or a single one of the above, a socket adapter, and balancing resistors.
>
> Or as Hue suggested a 12SK7, 12SG7, or 12SH7 and a socket adapter.
>
> The last two might make a better oscillator as they show higher
> transconductances.
>
> None of the last three above would need balancing resistors since their
> filament requirements are identical to the 12A6.
>
> Might have to play with biasing of the buffer to get a bit more drive,
> though.
>
> Looks like Hue's suggestion is far better than mine.
>
> Gee...
>
> Ken W7EKB
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