45/2A3 Single Ended Mono Power Amplifiers These amps now 10 years old use the Tango NC-20F interstage transformers and XE-20S output transformers regarded by many as superior to the later Lundahl transformers that are now used choice between 45 or 2A3 as output tube 2 Watts (45) per channel / 3.5 Watts (2A3) per channel input sensitivity 1.2 V interstage transformer coupled input impedance 600 Ohm SE (RCA) and BAL (XLR) inputs 4 chassis (mono blocks with external power supplies) 45 directly heated driver tube (optional 10Y).
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