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Old 9th January 2002, 05:54 AM   #1
diyAudio Member
Join Date: Dec 2001
Location: Oregon, USA
Question Help needed - resistor/fuse burnout

Thanks for the previous input. I replaced my caps and used the variac since I had it hooked up any way. At about 80 volts input my power resistor started smoking. I replaced this also. I guess I shouldn't have been surprised since the old one was mostly cooked, but I thought it may have had to do with the filter capacitor. The rectifier tube is the 5AR4 with a dual can capacitor and a 100 ohm 10 watt resistor which then goes to the 6BQ5 Screen. Originally the cap was 40/80mfd 400vdc but in replacing I went with a 20/100mfd which I was told would be ok or maybe even better. The cap is a NOS electolytic - could this be the problem.

After the initial start up I shut it down and checked my wiring to make sure nothing was shorting out, and then cranked it up again. It didn't smoke this time. I only took it to about 80 plus volts (enough to get some sound out of the speakers) After a minute or 2 the 2 amp slo-blow fuse went. And I realized I have a problem.

What could cause this excessive current draw?

Once again I greatly appreciate your assistance on trouble shooting this.
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