In Reply to: RE: Is this feasible? Rectifying 6.3v for heaters posted by Audio Pete on December 15, 2017 at 12:27:54:
Hi Pete,
That was a selenium rectifier as was the heater rectifier. Selenium rectifiers have a reverse breakdown voltage of several tens of volts so high voltage rectifiers took a big stack. For a full wave bridge it took four stacks. That got sizey and expensive. For the low current required they got by. In my update I went to a silicon bridge. The schematic for that will follow. Soon hopefully.
Oddly my Citation 5 Power Amp which was contemporary with the Citation 4 used two silicon diodes in a full wave doubler configuration for B+ supply. That was about the time silicon diodes were becoming available so they were a bit spendy.
Phil
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- RE: Is this feasible? Rectifying 6.3v for heaters - coffee-phil 15:05:08 12/15/17 (0)