[78-L] RCA dealers' phono?

[Royal Pemberton]

Without a schematic, or the chassis here in front of me,  I can't tell you
specifically, although one use a 6J5 (low-mu triode) could serve would be as
a phase inverter/driver for a push-pull output circuit.

On Thu, Mar 10, 2011 at 4:50 AM, Robert M. Bratcher Jr. <
rbratcherjr at yahoo.com> wrote:

> Ok then the 6SQ7's drove the 6K6GT's but what was the 6J5 used for? Or do I
> have
> it completely wrong? Perhaps the 6J5 drove the 6K6GT's as a preamp & the
> 6SQ7's
> were for the bass & treble circuit?
>
>
>
>
> ________________________________
> From: Royal Pemberton <ampex354 at gmail.com>
> To: 78-L Mail List <78-l at klickitat.78online.com>
> Sent: Wed, March 9, 2011 10:32:35 PM
> Subject: Re: [78-L] RCA dealers' phono?
>
> 6SQ7s would not be output tubes; they were small-signal high gain triodes
> with diodes (a precursor to such as the 6AV6) intended for AVC control in
> radio circuits.  The 6K6GTs (pentodes) would be outputs.
>
> On Thu, Mar 10, 2011 at 4:17 AM, Robert M. Bratcher Jr. <
> rbratcherjr at yahoo.com> wrote:
>
> > 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......
> >
> >
> >
> >
> > ________________________________
> > From: DanKj <MLK402 at verizon.net>
> > To: 78-L Mail List <78-l at klickitat.78online.com>
> > Sent: Wed, March 9, 2011 7:37:00 PM
> > Subject: [78-L] RCA dealers' phono?
> >
> > The logo on the speaker grille (burlap?) and ad wording on the cabinet's
> > edge
> > make this a store demo model, yes?
> >
> > http://tinyurl.com/48b995u
> >
> >
> > I'm wondering: Was it just for playing records, or did it represent an
> > actual
> > model for sale?  And was a 6-tube amp normal
> >
> > for a crystal pickup, or were they just to drive the 12inch speaker &
> > impress
> > the customers ?
> >
> >
>
>
>
>
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