[ARC5] 12 V Power pentode.

[Dennis Monticelli]

Ken,

All of the video amp tubes are power pentodes.  The 12V fil types are 9
pin.
e.g. 12BY7, 12HG7, 12GN7.  The latter two are frame grid types.

I have built QRP transmitters with all three of them.  The high gain of the
frame grid really helps to keep crystal current down.  All video amp class
tubes have good isolation.

Dennis AE6C

On Sat, Apr 9, 2016 at 8:47 PM, Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> Does anyone here know of a power-pentode, which is 1) not a beam-tube, 2)
> has a 12.6 V filament, and 3) might have an octal base?
>
> #3 isn't all that important: I can build an adapter. But #s 1 and 2 are.
> And #1
> is of prime importance.
>
> I can't think of any.
>
> Anyone?
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
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