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In Reply to: RE: Did some further testing posted by DAK on July 07, 2015 at 16:09:50
If you're seeing +11 volts on the grid of the phase splitter then something is wrong with those coupling caps. If you have another cap around of any value, swap those out and re-measure. That's very strange although I have occasionally encountered multiple bad caps from the same production run.
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You have a pair of ECC83 drawing current through a series connection of 1K and 22K resistors. Figure each half does 0.001 amps. So you have 0.002 amps going through a 22K resistor. The grids are referenced to that point through 2M2 resistors. 2 millamps across 22K should develop 44 volts. So I would expect the grids to be 44 volts above ground. The cathode has an addtional 1K resistor would would make the cathode 2 volts above the grids...as in 46 volts above ground.
Or maybe I see it all wrong?
Hi Russ, thanks for explaining that. I was sure that the circuit was supposed to have DCV at that point but since I was tracking down the problem and did not have voltage charts I was not certain of what the voltage should be at that junction. unfortunately, I did change out the 2 caps just to be on the safe side, with a pair of 800vdc ERO film caps. But I think I will put the VitaminQ ones back. BTW, what type of phase splitter is this called? It is not that common as I only ran across it a few times and long ago. thanx again, cheers, Dak
Edits: 07/11/15
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