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Old 16th Sep 2020, 11:50 am   #45
Phantomrose1999's Avatar
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 161
Default Re: FRG-7. Very quiet

Great news ! Fixed.

As mentioned there was almost no output at TP104. Even after replacing the Q101 and Q104. It was able to pick up strong signals including some BC stations. That is what threw me. Next I checked all oscillators and they were working So I checked the signal from pin 3 of Q106 through Q107, Q108, Q109. Then I found no signal beyond Q109 !

Removed Q109 and found it to be dead. Removed Q108 and it had an hfe of 90.

I had two 2SC930’s which had a hfe of 110 and 130. So I put them in as they are pin compatible and was so excited that it was picking up shortwave with just a wire. So all good.

Will recap the unit someday.
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