QRZ Forums - "Boat Anchor" & Classic Equipment for Sunday 19 March 2017
 

"Boat Anchor" & Classic Equipment

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Icom751 bad transistor 2sc3402 connector board change to - any ideas?

Posted: 19 Mar 2017 07:23 AM PDT
http://forums.qrz.com/index.php?thre...-ideas.559566/

If anyone done this b4 Il be glad to hear about it - small relay on
connector board dont switch and the sanyo transistor 2sc3402 out of prod.
think its some kind of darlington tr.

Will be glad for any tips

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6 transistor radio has me stumped

Posted: 19 Mar 2017 06:44 AM PDT
http://forums.qrz.com/index.php?thre...tumped.557817/

Just picked up a Zenith Royal, 1962; 6 PNP germaniums inside. Replaced the
3 electrolytics, found a solder spike rammed into another wire, but there
is one remained issue. No LO. I can inject 455kHz into the 1st IF and
there is lots of audio. Basically, the convertor transistor is not
oscillating. The coils involved are not open, the PNP has normal bias.
Can a germanium lose high frequency gain, and still have good DC bias? of
course, "high frequency" in this case is 1.5MHz.