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In Reply to: RE: He who hesitates is lost........ posted by vinnie2 on April 22, 2016 at 18:18:36
Because something is wrong. You could have a bad tube or a bad part (shorted resistor or a failed coupling cap) Measurements will pin point your problem.
Follow Ups:
Can I do the voltage checks at less than full B+? I am a little leary of giving it full throttle for as long as it will take to do all the measuremnents. Only had it on for a minute or two so far.
you can ramp up. Measure the overall B+ current and stop the ramp up when you reach the 100mA or so you are shooting for then stop. If this is 65 volts AC so be it. Then you can measure around and find the bad guy causing the high current drain.
I do have a variac. Where should I be measuring the 100mA?
Early on in the power supply. If you have a CLC or CRC filter as the first section, measure the voltage drop between the two capacitors. Take the voltage and divide it by the resistance of the resistor or the choke DCR. You can monitor this as you ramp up the voltage. When you get to 100mA, stop increasing the voltage and start measuring the various voltage drops in the amp, Plate resistors, cathode resistors, B+ dropping resistors. You will find a voltage drop measurement that is higher than the others or higher than it should be.
Ok, will do. Will report back when I get some numbers.
Thanks!
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