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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: My 5U4GB filament gives scary flash when turning on the H+.. posted by stewcle on March 20, 2007 at 23:43:43:
By lucky coincidence I'm modifying a jukebox with a soft-start on a 5U4GB. The manufacturer placed a 20kohm 10 watt white coffin resistor between the rectifier output and the first cap, in this case 80uF. The resistor acts as a current limiter during startup and is switched out (shorted) once voltages stabilize. Soft-start is a secondary benefit, since it's a jukebox the primary function was to put the amp into low-current standby when not in use to extend tube life.
Thermionically addicted.
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- Re: My 5U4GB filament gives scary flash when turning on the H+.. - rdf 10:02:16 03/21/07 (0)
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