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In Reply to: RE: damper diode heaters posted by robertpeterson56 on August 17, 2015 at 17:32:20
Which damper diodes are you planning on using? What rectification topology are you going to use?
Eli D.
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I have some 6au4gta tubes and I plan to use a pair in a full wave configuration.
Robert
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.
I think 30 second conduction time is waaaay optimistic. The only ones I have seen that will take this long to warm up are the Hy-G-300 line from Bendix( ex the 6754 ). none of the TV dampers took more than 15 seconds to begin conduction. They were better than the 10-12 seconds it takes an f32 GZ34 to come on though...:)
I select/grade these by heater current load; the higher the heater power the more efficient the diode in most cases. types like 6DN3 are quite good.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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