[78-L] RCA dealers' phono?

[Royal Pemberton]

So I'd guess about 8 clean watts output.

On Thu, Mar 10, 2011 at 2:15 PM, Royal Pemberton <ampex354 at gmail.com> wrote:

> 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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>
>