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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: Consequences of an imbalance between the two sides of a 5U4G rectifier Part II posted by Tom Bavis on July 7, 2008 at 18:36:02:
The typical Hickok rectifier test circuit uses a tapped 35VAC winding to provide both filament and plate voltage. Therefore, on average, one plate-cathode element will "see" roughly 34VAC while the other will see ~31 VAC. This is a result of the voltage drop across the filament. Hickok usually accounted for this by either giving a different "shunt" or multiplier value for each plate in an attempt to provide equal noninal or reject values on the meter. An indirectly heated cathode type rectifier such as a 5V4 doesn't have the filament voltage drop issue and Hickok's setup reflects this.
Every std Hickok tester I've seen gives a different shunt/multiplier value for the 5R4 so I suspect that Alpha Al's set-up info is in error. Hickok's set-up info was known to be in error once in a while.
IMO, this discussion brings up a really major point about testing and comparing power rectifiers with a std Hickok tester circuit: With less than 35VAC on the plate, take all readings with a huge grain of salt and don't expect to find arc prone tubes with it.
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Follow Ups
- RE: Consequences...That's pretty much it... - Steve O 10:34:56 07/08/08 (0)
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