Adcom GFA-555

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I've recently got a used Adcom GFA-555 in the earliest version like the one as shown in the picture here. It's an amp over 20 years old and I have no idea of its history. I'd like to check it electronically. Anyone kind enough to send the full service manual to me? Thanks in advance! :)

The amp sounds very good! Another excellent design by Nelson Pass.
 

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