[Boatanchors] AVR-20 output transformer wiring?

[Al Klase]

Ian,

The resistors do sound like an attempt to make up for an open transformer.

FWIW, there's a manual here: 
http://www.vmarsmanuals.co.uk/archive/969_RCA_AVR20_Aircraft_Communications_Receiver.pdf

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 5/17/2015 11:40 PM, Ian Wilson wrote:
> I picked up an AVR-20 (OK, this is an anchor for a tiny boat).
> Electrically this is in good shape except that someone has
> performed magic rites on the output circuit. There is some
> audio output but it is very low and has a pretty high LF
> cutoff.
>
> The phone sockets show reasonable DC resistances to ground.
>
> The plate/screen grid circuit of the 6B8 has been hacked; there
> is a 220k resistor from the plate to B+ and a 1M resistor from
> the screen to B+.
>
> I cannot identify the connections to the primary of the output
> transformer underneath the chassis. Just too many wires. And
> the regulator subchassis blocks some of the view.
>
> If the transformer is o/c, I may have a replacement. But I
> don't want to start on large disassembly jobs until I can take
> some measurements.
>
> Does anyone have a picture/description of where the
> primary leads run?
>
> Thanks for any info,
>
> 73, ian K3IMW
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