[Boatanchors] HRO-50 Audio Issue

[Al Klase]

Joe,

Of course, you've swapped the output tubes left to right.

1) Use a scope or an AC meter to make sure you're getting audio dive to 
both 6V6 signal grids.
2) Carefully measure the resistance of both sides of the audio output 
transformer primary. I'm thinking shorted turns.

Good luck,
Al

On 3/3/2014 8:35 AM, Joe Connor wrote:
> I'm making progress on this set, but I've encountered a puzzling audio problem. The symptom is low audio output.
>
> When I remove one of the 6V6s, the audio drops greatly. When I remove the other, it has no effect on the audio output. Ordinarily, I would suspect a bad audio output xformer, but I have the proper plate and screen voltages on both 6V6s. Both 6V6s test good and I've substituted known good 6V6s with no change. I've replaced all the caps and out-of-spec resistors in the 2nd AF stage. It appears the audio output xformer is a replacement.
>
> Any ideas? A link to the Rider's schematic is attached below.
>
> As always, thank you for your help and guidance.
>
> Joe Connor
>
>
> http://www.nostalgiaair.org/PagesByModel/395/M0012395.pdf
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/