Anyone ever use DC to heat rectifier tubes? - diyAudio
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View Poll Results: How do you heat?
AC every time 2 40.00%
Rectified and smoothed DC 0 0%
Rectified and Regulated DC 3 60.00%
Voters: 5. You may not vote on this poll

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Old 3rd May 2010, 06:09 PM   #1
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Join Date: Apr 2008
Location: Oakley, California
Default Anyone ever use DC to heat rectifier tubes?

Hello, I have plenty of parts to use up, and was just wondering if anyone ever uses DC to heat rectifier tubes? I use a regulator to run 6.3VDC to run my EZ81 in my test supply, and noticed less hum in my circuits. Would you be able to do this in a 5AR4 style circuit if you kept the filament supply floating? I've got a pile of LM317T to use up and figured They'd be useful here.
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Old 3rd May 2010, 06:28 PM   #2
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Join Date: Apr 2003
Location: Southern Tier NY
Why would you? Any resdiual hum from the filament would be swamped by the hum of the primary AC being rectified.
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