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In Reply to: RE: Scott 340B (late) posted by Michael Samra on May 31, 2016 at 19:07:17
Mike,here it is...
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Edits: 05/31/16 05/31/16 05/31/16Follow Ups:
Most of your tubes are listed right on your chassis if the lettering isn't worn off. Here is a diagram so take a look.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 06/01/16
Hi Mike,Your kind of right. :)
The reason why I originally wrote this is because of the mostly worn-out lettering to id tubes on the chassis.
The diagram for the 340a is great, but the FM multiplex section IS* different, according to the 340b (early) diagram.
An example: the early "B" diagram shows two tubes to the right of the box labeled "FM MULT."
My 340b has no box there, but a plate with three tubes.
That I believe is the main difference between the two.
I think I have some circuit tracing ahead of me.
Proudly serving content-free posts since 1984.
Edits: 06/01/16
Here is one like yours.The tube closest to the front in the MPX is a 12AT7 and the one by the taller square can that says stereo threshold is a 6KE8 and the one in the back is a 12AX7 in back of the shorter can.
Here is the whole tube complement
10-tube, Amplifier section:
(4) 12AX7 - preamps
(2) 6U8/6GH8
(Split-load phase inverters)
(4) 7591 outputs5-tube, FM Tuner section:
(1) 6BS8/6BQ7 - FM RF amp
(1) 6U8 FM mixer
(2) 6AU6
(1) 6HS63-tube, FM MPX section:
(1) 12AT7
(1) 6KE8
(1) 12AX7
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 06/01/16 06/02/16
THAT is the info I was looking for right from the beginning!
(I got all the other info before I posted from the same sources that everyone else did, sorry I was not clear about that.
Proudly serving content-free posts since 1984.
Glad I could be of some help.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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