In Reply to: RE: damper diode heaters posted by robertpeterson56 on August 17, 2015 at 18:02:58:
While a separate transformer for the rectifier heaters provides some power-up flexibilities, the 6AU4 carries a DC h to k rating of -900V so you can probably get away with one ground referenced 6.3VAC heater winding for everything.
Don't have a 6AU4 in front of me but most damper diodes have a plainly visible spiral insulator thing between the filament and the inner cathode tube. This provides for both the relatively high h to k voltage rating AND a really slow warm-up approaching 30 sec.
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Follow Ups
- RE: damper diode heaters - Steve O 19:10:25 08/17/15 (1)
- RE: damper diode heaters - PakProtector 04:27:44 08/21/15 (0)