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I've determined that the chassis came out of a 55X from 1942 and I've also determined that the center radio/phono switch was added later. The only problem was that when the set was switched to phono, some radio reception still "leaked" thru. So, I used the other side of the switch to kill the B+ voltage going to the converter tube when the switch is set to phono. I also aligned the set and it is more sensitive now; but, there are oscillations, motorboating, and other strange noises when tuning across the dead areas and weaker stations across the band. It's not so bad on strong local stations; but, I want to try and figure out what's causing this problem.
Whoever wired in the phono cable had the negative side of the cable connected straight to the hot chassis. This makes the record changer chassis hot, since the negative side of the cable connects to the record changer chassis. To help solve this problem, I connected a .047 uf cap between the negative side of the phono cable and the hot radio chassis.
I also rewired the AC input so that the neutral side of the polarized power cord goes to chassis and the power switch is now in the hot side of the line. Of course, this will do no good if someone were to plug this set in a miswired AC outlet.
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