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Old 27th September 2012, 09:29 PM   #1
diyAudio Member
Join Date: Mar 2008
Default Battery filament for 4P1L


is this good idea?

Today I found on net very cheap UltraFire 18650 4.2V Rechargeable Lithium Battery 3800mAh Red for LED Torch
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Old 27th September 2012, 09:58 PM   #2
diyAudio Member
Join Date: Sep 2003
Location: London
Well, I always use 4P1L in filament bias. So I'm using about 14.5v bias, 180v plate using glow tubes 0A3 and 0C3. So my supply is about 21v at 600mA. 4P1L is great in filament bias.
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Old 28th September 2012, 01:52 AM   #3
mwiebe is offline mwiebe  United States
diyAudio Member
Join Date: Apr 2004
Your battery idea is fine, don't worry too much if you don't hit the exact filament voltage of 4.2V. It's a great tube so the important part is getting started using it. I've used three 1.2V NiCads in series which works fine as well. If you like what you hear you can invest more time and money in a filament supply.
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