[78-L] RCA dealers' phono?

[Robert M. Bratcher Jr.]

Now that I think about it I'm pretty sure that your right about the circuit. 
What do you think those 6K6's put out to the speaker? About 10 watts perhaps? Or 
less like maybe 5 or 6 watts?




________________________________
From: Steven C. Barr <stevenc at interlinks.net>
To: 78-L Mail List <78-l at klickitat.78online.com>
Sent: Wed, March 9, 2011 11:41:47 PM
Subject: Re: [78-L] RCA dealers' phono?

From: "Robert M. Bratcher Jr." <rbratcherjr at yahoo.com>
> Well the 5Y3-GT was the rectifier. I don't know what they used the 6J5 for
> (anybody know?) & either the 6K6-GT's or the 6SQ7's were the final 
> amplifier
> tubes in push pull I'm fairly sure. What the other pair of tubes (either 
> 6K6-GT
> or 6SQ7) were for I have no idea without looking at the schematic for this 
> amp.
> If anybody knows more about this amp & how it works please let us 
> know......
>
At a guess...and based on decades of collecting, repairing and restoring
old radios...the 6K6's were the output "power tubes" and the 6SQ7's
were the stage preceding them. The 6J5 (a common triode) was
probably a "phase inverter" feeding one of the two 6SQ7's.

Steven C. Barr