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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Filament Failure! posted by gusser on March 24, 2015 at 10:08:42:
If I test the filament voltages and find them above 6.5v I install 2 watt metal oxide dropping resistors to bring the voltage down. I found that about .22 ohm to .33 ohm in each line will bring the voltage from 6.5 to about 6.1 with the .33 ohm resistors. Works great. cheers, Dak
PS, this was for a SE amp running 2 7591 and 1 12ax7. For an amp running higher filament currents you may need to use higher wattage dropping resistors.
Edits: 03/24/15
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