Plug in adaptor for old Sontecs EQs or Comps with potted rectangle opamps like HS1000, HS1020 and HS1050.
Allows descrete opamps like JLM99v, Hybrid, JLM 25HV, JLM35HVFET, 990, 992, 993 etc to plug in and run on either +/-28v or +/-24v by removing the 2 jumpers.

Leave jumper links fitted (+/-28v) for JLM99v, JLM25HV, JLM35HVFET
Remove jumper links (+/-24v) for Hybrid, 990, 992, 993