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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: actual bias point is slightly different, but only slightly posted by Todduk on March 30, 2007 at 16:16:44:
There are only four pins to a 300B. Two are the ends of the filament, the other two are grid and plate. You'd need a fifth pin to CT the filament.You create the virtual CT with the hum pot across the filament. Even with PP, two separate heater TX's, one winding for each filament in combination with a hum pot is enough to get the cathode's hum contribution out of the picture. Most tubes are good enough a simple CT winding can do the trick...but it is no guarantee.
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Follow Ups
- center tap on 300B? - Try-ode 06:09:11 04/06/07 (0)
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