[78-L] RCA dealers' phono?

[Royal Pemberton]

For two 6K6GTs in push pull, my RCA tube manual RC 23 (1964) shows 9.8 watts
at 4% THD for 285 volts on plate and screen, cathode bias, and 10.5 watts at
6% THD for 285 volts plate and screen, fixed bias.

On Thu, Mar 10, 2011 at 6:59 AM, Robert M. Bratcher Jr. <
rbratcherjr at yahoo.com> wrote:

> 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
>
>
>
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