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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: KT88 to replace 6550 posted by Rabski on February 6, 2009 at 08:27:09:
"Even with the relatively new Svets, one is on the edge of not biasing and the other three need the pots turned a long way up. I can't find a schematic or figures for the Premier 11, so I don't know if the voltages are a bit low, or the valves a bit screwed!If anyone knows the 'proper' volts, please drop me a line so I can start eliminating possible problems, rather than spending fortunes on valves."
This can be determined without too much trouble. Here are the steps:
1. Measure resistance from ground to one 6550 cathode (amp off)
2. Turn the amp on, measure cathode voltage, grid voltage, and plate voltage for all tubes (DC).
3. Post the numbers here
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Follow Ups
- RE: KT88 to replace 6550 - Caucasian Blackplate 02/6/0908:55:35 02/6/09 (2)
- RE: KT88 to replace 6550 - Rabski 08:57:26 02/6/09 (1)
- RE: KT88 to replace 6550 - ironbut 10:04:00 02/6/09 (0)
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