[ARC5] 12 V Power pentode.

[Jim Wiley]

This is gonna sound kinda stupid, but lacking anything else,  how about 
a 6K6,  plus a series dropping resistor for the heater?

The 6K6 is indeed a pentode,  just not a beam pentode.  Will that do?  I 
did look for a 12K6, admittedly not all that hard, but it seems to be 
one of those that was skipped for some reason, perhaps for the same 
reason as there is no 12SB7.

The actual power dissipated by the series resistor is about 2.5 watts. A 
15-ohm 10 watt series resistor would allow a 4X safety margin for long 
service life.

- Jim, KL7CC


On 4/9/2016 7:47 PM, Kenneth G. Gordon 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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