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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: KT88 to replace 6550 posted by Rabski on February 6, 2009 at 05:57:48:
I would bet that your Premier 11a is closely related to the MV75. The possibility of an impedance mismatch really hinges on how flat your speakers' impedance curve is, which it is not. There really isn't a strong argument for that being much of an issue.
If you install the 6550's and you find you can't get the biasing voltage high enough, you can reduce the value of the 18k resistors that sit between the bias pots and ground (these are 18k on the MV-75, but they are probably not hard to find on your 11a with a schematic or a couple of photos). Modding the amp for a wider range of bias voltage isn't a terrible idea anyay.
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Follow Ups
- RE: KT88 to replace 6550 - Caucasian Blackplate 02/6/0907:29:25 02/6/09 (8)
- RE: KT88 to replace 6550 - Rabski 07:40:27 02/6/09 (7)
- RE: KT88 to replace 6550 - Caucasian Blackplate 07:45:20 02/6/09 (6)
- RE: KT88 to replace 6550 - Rabski 08:32:08 02/6/09 (1)
- RE: KT88 to replace 6550 - Caucasian Blackplate 09:20:46 02/6/09 (0)
- RE: KT88 to replace 6550 - Rabski 08:27:09 02/6/09 (3)
- RE: KT88 to replace 6550 - Caucasian Blackplate 08:55:35 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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