[Milsurplus] AT-12 Photo

[Kenneth G. Gordon]

On 8 Mar 2017 at 17:09, Richard wrote:

> Postscript:
> 
> Looking at the At-1 book, it shows pin 4, the suppressor grid, directly 
> connected to one side of the filament.  One could directly ground pin 4 
> for an 807, but that bypasses the plate metering circuit, or use it 
> as-is, as the filament is heavily bypassed and should work fine.

Hmmm...after thinking about this for a bit, it seems to me that having the cathode/suppressor 
and one side of the filament connected together shouldn't make any difference at all.

At this point, I'm with you: I would simply plug the 807s into the sockets in place of the 814s 
and fire it up.

I'll bet it will work perfectly well.

He should probably make sure that the filament voltage to the sockets was 6.3 V and not 10 
V though, although 10 V on an 807 filament probably wouldn't hurt it any... at least not for a 
while, anyway...

Ken W7EKB

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus