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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: RE: Recheck the entire PS rail posted by timp on January 16, 2012 at 19:43:02:
Most power supplies have several parallel pi-filter circuits and points where voltages are tapped off (see schematic---C,D,E points, where B = 480VDC going to CT of primary side of output transformer).These are the voltages to measure to be sure the PS rail is properly setup and working. Usually, B > C > D > E, as in this Ampeg amp. If you read E = or > C or D, then there is a problem.
From there, you measure the voltage on the anode plates. If there is a discrepency, the problem(s) lies between the tap off the PS point and the anode. A good suspect would be a bad dropping resistor in that line or a bad coupling cap in the previous section.
Edits: 01/16/12
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Follow Ups
- RE: Recheck the entire PS rail - FenderLover 20:36:14 01/16/12 (1)
- RE: Recheck the entire PS rail - timp 21:13:12 01/16/12 (0)
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