[Milsurplus] AT-12 Photo - 814 vs 807

[Kenneth G. Gordon]

On 8 Mar 2017 at 21:57, Hubert Miller wrote:

> Exactly. For some reason, coming up with 1000 or 1100 volts is an
> increment more difficult than say 600 or so, which you can find many
> transformers for. Plus, i really have no interest in running a CW rig
> more than about 75  watts or so. I could pull one 814 and run the
> remaining one on 600 volts, or put in one or two 807 with some nonmajor
> wiring revision. Decisions, decisions. ( And very little action. ) 

After thinking about it, and with the info Richard provided, I don't think you are going to have 
to make ANY wiring changes, although you should make sure the filament voltage to the 814 
sockets is 6.3 V instead of 10 V.
 
I think that if you replace the 814s with 807s you will have to do nothing and it will work just 
fine.

Do you happen to have a schematic for that AT-12 you could share?

Ken W7EKB

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