[Boatanchors] HRO-50T Saga: Quick Transformer Question

[Al Klase]

Joe,

The way to double check these things is to start with the tube data sheet:
http://www.mif.pg.gda.pl/homepages/frank/sheets/191/6/6V6.pdf

See "Push-Pull Class A1 Amplifier." For approximately 250 volts on the 
plates, and 16 volts on the cathodes, i.e. -16 volts G1 bias, the 
effective plate-to-plate load resistance is 10K ohms. So far, so good.

The next thing to check is that the low impedance secondary of the 
output transformer really does connect to R-44. This is the 
negative-feedback path that should make the amplifier nice and linear. 
Phasing counts. The amp will oscillate like there's no tomorrow if the 
phasing is wrong.

Good luck,
Al

On 3/6/2014 11:44 PM, Joe Connor wrote:
> I have a question about whether the prior owner put the proper replacement audio output transformer in this receiver. The audio is much better than it was but is still not as good as I would expect from push-pull 6V6s.
>
> The replacement is a Merit A-3027, which has a 10,000-ohm CT primary. In looking through the Sams service material, no Merit replacement is listed. Further, Sams lists the primary impedance as 6,000 ohms CT, not 10,000 ohms.
>
> Could this difference in impedance be giving me less than optimal audio output? If so, I'll probably buy a new Hammond (125D) and install that. What do you think?
>
> Again, thank you for your help.
>
> Joe Connor
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/