The vacuum tube Leslie amplifiers still had their multiple stage power supply with a choke between the first and second filter capacitor stages.
A schematic for the both versions of the Leslie 22H amplifier here. The 5U4GB rectifier and its solid state silicon diode counterpart design:
http://www.captain-foldback.com/Leslie_sub/Leslie_schematics/22H.GIF
Don Resor
-----Original Message----- From: Jay Hennigan via Jukebox-list jukebox-list@lists.netlojix.com wrote:
A choke-input power supply filter is much more friendly to solid-state rectifiers. NTC thermistor is an alternate choice to the resistors that greatly reduces inrush but doesn't generate as much heat or waste as much power during operation.
Of course both of these are more expensive than the alternatives.
Granted these were instrument amplifiers and not hi-fi quality but they operated for decades trouble free.
Number of on-off cycles as opposed to total time in operation would correlate better with failure rate IMHO.
-- Jay Hennigan - jay@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
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