Yet another build of an OPAMP based piezo pickup preamp. The OPAMP again is an OPA2134 (socketed). The single cct. brd. holds both the differential PS, generated by a resistive network and capacitors and the preamp section itself. Control of treble is via a small pot and can be used to "tone-down" surface noise found on most 78 records. There is a battery test point at the front of the preamp to allow easy battery checks without opening the case.
A mustard cap is used on the input and a poly on the output. Internal wiring is solid core copper wire. The case is cast Al and again I have used the hammertone finish which I think is quite attractive. This completes my 78 setup with a new stylus in my Ronnette piezo cartridge. With some reasonable 78s I have managed to get some enjoyment out of the shellacks.
