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In Reply to: Re: BATTERY for filament heating posted by stelios on October 26, 2001 at 13:08:47:
the batteries don't effect the bias any differently than any other DC supply does... depending on which side you reference you get a different bias...
to be honest i haven't done much with dc supplies in dht's i just noted the difference in bias and clipping depending on which side you reference... as i recall i like referencing the ground side for outputs so the entire filament is at or above so A2 operation is farther away, but for a driver that has headroom... i'll take the + side to ground for that little extra bias for free... it means the rest of the needed total bias is a little easier to get, you just have to be aware that A2 will start at the filament voltage and not 0 V so keep clear.
this is another one of those things that i would like to see a fuller treatment of... i guess you could look at it as using a -7.5V supply on a 10 used as a driver... why not??? as long as you keep deep class A (has anyone ever done a class A2 driver???) and of course the whole thing is not much of an issue with a 2A3 at 2.5V... but the GM70 at 20V thats a different story.
on the paralleling nicads... not sure... some batteries handle it better than others... and charging/discharging have different requirements... not sure what applies to what type...
time to crawl back into the box... man its boring in there!
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