Hi Guys,
Obviously, one or more chips/transistors have popped due to the hi-voltage fault.
Gotta scope the signal from RF in to IF etc, so the proper way is to apply a good signal from a sig gen and trace it through.
I could offer to give it a shot at fixing it , assuming that if one of the special IC's are gone I can find them.
Could unsolder the IC and socket them, so it will be easier to change, one or more will have to be done anyways.
Too bad they did not stick with the ole HA1137. Sounds like a real pain to get it out, especially if it has those wire wrapped connections, but I have done this before.
Might think of sourcing some spare parts off an old tuner in the SX-?80 series as they are the only ones using those PA-? parts.
Their is the detector, mute(This one is the one that hard to find) , PLL stereo ics the Toshiba IF chip but if is bad & can not be found, you can figure out a way to use the HA1201, just refer to the other tuners in the sx-?80 series.
I should offer a kit to replace these old tuners with a electronic tuner
Remove the center tune mtr and replace with a 7 segment x 4 Amber LED and replace the flywheel with a encoder, it is really that simple, with a MCU. Might do this with a current hacking of a Sansui G-7500 (Piece of crap) and putting in a SX-1250 transformer plus a TI LME49830/Exicon Lateral FET PA.
Good luck mate.
Rick