60hz hummmm Signal Corps AM-186

[Dmichel123]

Yes. Reading 3V + 3V = 6V.

 

[scott2000]

Maybe there is some kind of connection goofed somewhere....

You mentioned that you elevated "all" the heaters at some point? How did you do this? Were there any connections that needed to be modified in order to make this happen??

Or maybe as CJ pointed out, the method used to rewind may not have been the best for this setup.....

 

[Dmichel123]

Maybe there is some kind of connection goofed somewhere....

You mentioned that you elevated "all" the heaters at some point? How did you do this? Were there any connections that needed to be modified in order to make this happen??

Or maybe as CJ pointed out, the method used to rewind may not have been the best for this setup.....

When I elevated the heaters, it was just the one winding that heats the amplifier tubes. I disconnected the wire that went from CT to ground and fed 100VDC into that CT.

 

[scott2000]

Where was that? At E3??

I disconnected the wire that went from CT to ground and fed 100VDC into that CT.

 

[Dmichel123]

Where was that? At E3??

I disconnected the ground wire from the CT on the transformer and alligator clipped to the regulator tube at 105V

 

[scott2000]

Trying to visualize.... 


Was the ct  tied to the rest of the chassis'...through the other connectors....???.. that shield at E3 was getting dc??....

Was the ct on the zz tap left floating at the transformer???

Sorry.... if it's obvious what you're saying...

 

[Dmichel123]

I'm trying to think of other ways to word it... I disconnected the wire on the CT that went to chassis ground and injected the elevation voltage directly to the CT on the transformer. It didn't change anything. Same hum. That CT is now connected back to ground, as it was originally.

I get 105VAC and 94VDC on the PSU chassis if I isolated that chassis from the other chasses and ground.

 

[scott2000]

That CT is now connected back to ground, as it was originally.

Where is this ground located?

 

[Dmichel123]

Where is this ground located?

It's a wire that goes to E16-4, up to the control chassis to E10-2, up to the amplifier chassis to E3-2, and then to ground in that chassis.