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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Arcing EL42 posted by Doug Eisemann on August 29, 2004 at 19:26:17:
Hello Doug ,
I think , you have only a bad tube , was this tube a Valvo ;-)?
Please , test this : 305 volts after the choke ( point 43 ) , 295 volts on both plates and -19 volts at point 28 ( the 400 ohm resistor is for the negative grid voltage , I hope , you have the right circuit diagram with all the measure points ) .
If you have more than 19 volts on point 26 and 27 ( the 1 k grid resistors ) then you have a damaged coupling cap ( point 40 and 41 ) .
But the worst case is a damaged output transformer :-(( .
Good luck , AlexK .
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Follow Ups
- Re: Arcing EL42 - AlexK 09:57:11 09/01/04 (5)
- Re: Arcing EL42 - Doug Eisemann 10:15:54 09/01/04 (4)
- Hey Doug, - j rodney 10:53:03 09/01/04 (1)
- Re: Hey Doug, - Doug Eisemann 15:29:04 09/01/04 (0)
- Re: Bad selenium rectifier or bad caps in power supply ? - AlexK 10:27:05 09/01/04 (1)
- Re: Bad selenium rectifier or bad caps in power supply ? - Doug Eisemann 10:51:22 09/01/04 (0)
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