In Reply to: Re: shared versus separate filament suppies.... posted by Vinnie on January 20, 2007 at 08:39:03:
If your tubes are matched exactly, no problem. But they could drift apart, one could need replacement, who knows. If they're cathode biased, they won't draw the same current, and the hot one may "run away" - goodbye!. You need to separate heaters (separate cathode resistors) or have adjustable bias for each.
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Follow Ups
- Re: shared versus separate filament suppies.... - Tom Bavis 11:31:15 01/20/07 (18)
- Re: shared versus separate filament suppies.... - Vinnie 14:59:04 01/20/07 (17)
- Re: shared versus separate filament suppies.... - Tom Bavis 17:48:55 01/20/07 (14)
- Re: shared versus separate filament suppies.... - Vinnie 17:52:29 01/20/07 (13)
- Re: shared versus separate filament suppies.... - Tre' 19:19:33 01/20/07 (12)
- Re: shared versus separate filament suppies.... - Vinnie 03:31:24 01/21/07 (11)
- Re: shared versus separate filament suppies.... - Tre' 08:51:28 01/21/07 (10)
- Re: shared versus separate filament suppies.... - Vinnie 09:56:49 01/21/07 (9)
- Re: shared versus separate filament suppies.... - Tre' 10:54:04 01/21/07 (8)
- Re: shared versus separate filament suppies.... - Vinnie 12:45:36 01/21/07 (7)
- Re: shared versus separate filament suppies.... - Tre' 10:39:10 01/22/07 (6)
- Re: shared versus separate filament suppies.... - Vinnie 14:21:05 01/22/07 (1)
- Re: shared versus separate filament suppies.... - Tre' 17:18:38 01/22/07 (0)
- Tre, a quick question...... - thermionic addictions 13:42:25 01/22/07 (3)
- Re: Tre, a quick question...... - Tre' 16:31:42 01/22/07 (2)
- Thanks. (nt) - thermionic addictions 14:33:31 01/23/07 (0)
- Re: Tre, a quick question...... - Vinnie 17:13:19 01/22/07 (0)
- Re: shared versus separate filament suppies.... - Tre' 17:44:09 01/20/07 (1)
- Re: shared versus separate filament suppies.... - Vinnie 17:50:42 01/20/07 (0)