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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: KT-88 bias in MB-3045 posted by elektron on June 18, 2009 at 20:10:59:
Electron,
It turns out that the Sovteks were the issue. When I got home tonight I pulled the KT88s and replaced them with a quad of Winged C 6550's (luckily when I looked they were original Svetlanas Winged C's not SEDs)and Biased them at 51ma. No more shrillness. The sound now had the same characteristics as when the 8045G's were installed. Funny you should mention the 220mfd Nichicons as I just noticed one of mine had started leaking any suggestions for a replacement source? The Final tube complement for each amp ended up as follows:
12AX7'S - Mullard Re-Issues
12AU7'S - Amperex UK
6240's - Zenith Branded (Probably Sylvania)6CG7's
KT88/6550-Winged C Svetlanas
Mike Samra and I have spoken about the lack of room in the chassis and to me maintaining the original look is important especially with an amp that looks as good as this one (It drove Mike crazy that I insisted he maintain the original look when he was working on my Mac 1500).
I would like to speak with you more about the Luxman and I also Have an original Futtermen H1a (the 6LF6's are as much unobtanium as the 8045Gs) but I am leaving on vacation tonight returning on the 29th can I reach you sometime the week of the 29th?
So thanks to all for the help. From Chris O & Caucasian Blackplate for the education and to you for the specifically Luxman Insights.
Regards, Jerry
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Follow Ups
- RE: KT-88 bias in MB-3045 - geraldm121 00:26:58 06/19/09 (1)
- RE: KT-88 bias in MB-3045 - elektron 04:57:31 06/19/09 (0)
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