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If memory serves me correctly you should have a voltage regulator transistor on the back left corner of the radio. The DC(B+) comes off the emitter of that transistor and goes to the on/off switch on the front of the radio. The B+ comes out of the front switch and goes back to the radio board...
Beware of fakes available online. The 2030 is obsolete and 2030+ MOSFETs that are genuine is what you want if you change them out. Power output will usually be inline with the IRF520s and the FQP13N10. However the FQP13N10 will usually (but not always) yield a slightly higher output than the...
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