Heater voltage 5volt!

dewz · 13th October 2011, 03:10 PM

Heater voltage 5v instead of 6.3. is not very critical?
Tube is 6n1 and 6p14

Thanks!

DF96 · 13th October 2011, 03:24 PM

You might get lower noise and lower gain, also lower output. Possibly shorter valve life if too much cathode current is drawn.

woody · 13th October 2011, 03:45 PM

If your transformer has enough current you could rectify that 5V.
5 X 1.41 = 7.05 but you lose about a volt across the vectifiers so you would
get ~ 6V .

kevinkr · 13th October 2011, 04:06 PM

Rectify using schottky diodes in a bridge and you might get pretty close to 6.3VDC for your filaments. A big cap will be required to get the ripple down to reasonable levels and a pi filter using a low DCR inductor of a few mH might be worthwhile. Nothing worse than ripply DC for filament heating - far worse than AC because of the high dvdt of the ripple voltage - it couples electrostatically into anything nearby and blasts through the cathode insulation..

13th October 2011, 03:10 PM	#1
dewz diyAudio Member Join Date: Apr 2011	Heater voltage 5volt! Heater voltage 5v instead of 6.3. is not very critical? Tube is 6n1 and 6p14 Thanks!

13th October 2011, 04:06 PM	#4
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Rectify using schottky diodes in a bridge and you might get pretty close to 6.3VDC for your filaments. A big cap will be required to get the ripple down to reasonable levels and a pi filter using a low DCR inductor of a few mH might be worthwhile. Nothing worse than ripply DC for filament heating - far worse than AC because of the high dvdt of the ripple voltage - it couples electrostatically into anything nearby and blasts through the cathode insulation.. __________________ www.kta-hifi.net

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13th October 2011, 03:24 PM	#2
DF96 diyAudio Member Join Date: May 2007	You might get lower noise and lower gain, also lower output. Possibly shorter valve life if too much cathode current is drawn.

13th October 2011, 03:45 PM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	If your transformer has enough current you could rectify that 5V. 5 X 1.41 = 7.05 but you lose about a volt across the vectifiers so you would get ~ 6V .

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