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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: I'd look at last stage... posted by Sector-7G on August 11, 2002 at 18:10:42:
Yeah, that "bootstrapped" driver can be problematic. I would still split the difference of suspicion b/w the inverter and the final drive; while DC coupling can wreak havoc in terms of swamping the control grids of the output, I have found that a small phase inverter imbalance (bad tube, out of spec resistor, leaky coupler) can be greatly magnified by the DC coupling. I wouldn't rule out a bad microchoke in between the KT88s either (if the new 275 uses them!) I damaged one with a thermal runaway 6550 and had a hell of a time tracking down the source of distortion and reduced power. Chris
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Follow Ups
- Re: I'd look at last stage... - Chris Spafford 18:47:35 08/11/02 (1)
- Of course that's where the signal tracing shines - Sector-7G 19:37:22 08/11/02 (0)
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