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16th April 2008, 01:44 AM
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diyAudio Member
Join Date: Oct 2007
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Rectifier and amp heaters on one supply?
Hi.
I need to heat a 6x4 and two 6922's from one 6.3v winding. Is there any inherent problems with this? diode heaters are normaly left floating while amp heaters are ususally referenced to ground or somewhat higher than Their cathodes. The 6x4 is indirectly heated and can take +/- 450v heater to cathode. I think I can reference the heaters a few volts positive of the 6922 cathodes with no problem. Power supply is hybrid bridge, 300 volt transformer sec. Also the specs say with 300v on the plates, the 6x4 needs 300 ohms resistance in the plate supply. This is for capacitor input filter. Does this apply to choke input filter as well? Cheers. Rolf. |
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