[Milsurplus] AT-12 Photo

[Richard]

The 814 has a small 5-pin base, the same as an 807, so it's an easy 
change.  However, the 814 is a beam-power tube, which is not so 
sensitive to plate voltage, and will probably work fine down to 500 
volts.  Overall efficiency will not be great when you're putting 32.5 
Watts in each filament.

Richard, AA1P


On 03/07/2017 03:59 PM, Hubert Miller wrote:
> I haven't seen my AT-12 manual in many years but as i recall the transmitter runs two 814 in the final.
> I believe the socket is the same as the 1625 and i thought maybe use 2 of those instead, to be more compatible with
> power supply parts i am likely to have.
> -H
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