Servicing the Hammond B-3 Type Pre-Amp
AO28 Layout AO28 Schematic General Description The AO-28 tube pre-amp is found in the Hammond B-3 as well as several other models. C-3, A-100, RT-3, D-100 etc. Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some […]
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