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RE: I've got a schematic somewhere,...

I cannot recall whether my made-by-Julius H3aa's had an on-off switch. In those days, it was often the custom to control the ampifiers via switch-able female AC outlets plugs installed on the back of the preamplifier. You could switch the amplifiers on and off from the front panel of the preamp. Modern purist approaches have done away with that custom, pretty much. I do know for sure that my ca 1980 Beveridge amplifiers were originally switched on and off via the front panel of the Beveridge preamplifier, for one example. I guess McIntosh used that system for ages, maybe even now. I had to install on/off switches directly on the Beveridge amplifier chassis's.


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