Chinese VHF 6m backpack 884 radio – bad finals (updated)

Had some time today to test the radio. The receiver works – it’s quite loud. It was surprising to find 2-3 very loud music broadcasters on 45-50MHz band. Apparently, there is no volume (AF gain) control on the radio – I even checked the schematics but no, there is no one.

I guess that’s considered normal for army radios?

Everything seems to work fine except there is no RF output! After closer inspection, I noticed that the RF finals transistors are missing:

photo

 

According to the schematic, the RF amplifier uses 2 bipolar germanium PNP transistors: 3AA9 and 3AA7 in TO-3 package:

884 rf finals schematics

 

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About va3paw
Ham radio enthusiast, software developer

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