[Milsurplus] Navy RAL Questions

[Kenneth G. Gordon]

On 17 Mar 2018 at 21:43, Joe Connor wrote:

> 
> Ken, I'd love to see the hi-res schematic.
> I don't have any wires connected to 7 and 8. The filament wires are connected to 
> 2 and 3 and, as you said, 1 is grounded. Should I be connecting something to 7 
> and 8, and could that be part of the problem?

No. 7 and 8 are in parallel with the audio jack on the front panel. You don't need to connect 
anything to those unless you are using the external two-receiver control box.

> 
> Here's something else. The filament secondary is center tapped. With the 
> receiver disconnected, the power supply reads 3.1VAC from each leg (posts 2 
> and 3 on the power supply) to ground. With the receiver connected, I get 3.5VAC 
> on one leg and 1.2VAC on the other.

Disconnect the center tap at the transformer from ground, then remeasure. I'll bet that's the 
problem. The filament winding in the original power supply was not center tapped, and one 
side of the filament is connected to ground through some other components which are 
pulling your filament voltage down.

I'll send you the schematic direct. Standby...

Ken

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