this is a rather cool and use full unit from Hameg, it came broken, but it was only leaked capacitors and deep cleanup, now it works fine again, so i am really happy about it.
IC date codes say 1992
This video show the two plugin modules :
HM8027 distortion meter, and HM8037 low Distortion generator
Link to page with many modules explained :
https://www.sm5cbw.se/hameg/hm80/
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#teardown
#test
#repair
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I use auto generated subs, i am sorry there are a few spelling errors,
maybe one day they can do it better..
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(Thanks to all my Sponsors / Traders / Swappers / Sellers / Buyers, without your support and constant flow of cool items in/out, none of this would be possible)