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In Reply to: RE: Scott 340B (late) posted by tesla on May 30, 2016 at 19:39:53
Thanks again, everyone. I already have the schematics, owners manual, and the early-model tube layout. I think my best bet is to trace out the tube locations.
Mike, I will take a picture of the chassis, and hopefully you can tell me what the missing tubes are.
Thanks again everyone, I should have been more specific on what I had before I posted.
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Post a top and bottom view with the cover off and the front face as well.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Mike,here it is...
Proudly serving content-free posts since 1984.
Edits: 05/31/16 05/31/16 05/31/16
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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