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FT-101 IF Board - Help needed


 

Hi Everyone,
I just joined the group, and am already posting a question, hoping somebody would have some information to share...
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I just acquired (salvaged/got from somebody who wanted to get rid of) an old FT-101 (Sommerkamp FT-277) which I set out to restore; the first thing I noticed was that in place of the PB1080A board, the last owner had installed an unknown board with a marking P04-004 - it looks very similar to the PB1080A, with the NB and a homebrew SSB filter, but the markings of the transistors are long gone... A search on the web has given nothing...
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I was wondering if anybody had any information about this board (link, schematic, etc)
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Many thanks and 73s, Joseph F4JVO
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