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RE: What you have is identical to the 340b early as far as tube layout.

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.



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Edits: 06/01/16

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