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Old 7th April 2009, 03:16 PM   #1
tubo is offline tubo  Philippines
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Default tube heater over voltage!please help...

hi folks,

the heater voltage on my 6v6 amp reads 8.20vac.... i tried dropping resistors in series with one of the filament pins from .5ohm to 10ohm i still see no drop in voltage.....please help



thanks,

ivan
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Old 7th April 2009, 03:27 PM   #2
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Are you measuring at the tube socket pins with tube in place? There's no voltage drop if there's no current...
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Old 7th April 2009, 04:10 PM   #3
tubo is offline tubo  Philippines
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thanks tom....problem solved! im now reading 6.1 volts! is the tube underheated? does it really need to be 6.3v?
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Old 7th April 2009, 06:59 PM   #4
Jeb-D. is offline Jeb-D.  United States
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6.1V is good enough.
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Old 7th April 2009, 10:33 PM   #5
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Quote:
Originally posted by Jeb-D.
6.1V is good enough.
Absolutely- and your tubes will last quite a bit longer as well, with slightly lower heater voltage.

John
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Old 8th April 2009, 11:37 AM   #6
tubo is offline tubo  Philippines
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thanks fellas! greatly appreciated!

God bless!


ivan
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Old 8th April 2009, 11:58 AM   #7
nkg is offline nkg  Australia
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Hi
Its also worth while having heater transformers custom wound with different taps on the primary. With nos valves becoming more expensive the cost is worth it .
nkg
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