Anyone ever use DC to heat rectifier tubes?

Lingwendil · 3rd May 2010, 06:09 PM

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.

SGregory · 3rd May 2010, 06:28 PM

Why would you? Any resdiual hum from the filament would be swamped by the hum of the primary AC being rectified.

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

3rd May 2010, 06:09 PM	#1
Lingwendil diyAudio Member Join Date: Apr 2008	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.

3rd May 2010, 06:28 PM	#2
SGregory Tubie Noobie diyAudio Member 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. __________________ Living Life Doing the Waltz in 4/4 meter.

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