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I am working on a project amp, it has a 5U4, puts out about 350v.
I wired in 2 diodes to one side of a 3 position switch and the 5U4 to the other, so I can select from the diodes or tube.
problem is the diodes seem to be putting out less voltage, around 310v. I did try a new pair, but same thing. What gives?
Follow Ups:
My guess is it's your switch. Check the resistance across the switch when it's "on" (but with the power off). I had this problem recently with a DPDT toggle switch that I used in a project....in the on position, one leg had measurable resistance...wound up pitching it and replacing with something higher quality.Also.....is your switch really rated for 350V? You might have to use something heavier duty that exceeds that rating.
If the voltage is a lot lower, maybe you have a blown diode. If the voltage is a little lower, maybe you mixed up which side is which and are really measuring the tube as lower. I can't think of any reason that the solid state devices should have higher forward resistance than the tube. A bad hot-as-hell solder joint, maybe?BTW, if you get this straightened out the solid state diodes will give you higher voltage, which might not be too good for your amp.
tested all diodes to be good. am I using them right, one from pin 4 and one from pin 6, (hv ac) both with the lines away from the ac, to one point.
my amp is able to take the extra voltage.
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