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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: Dyna ST-35 / Tube Glow posted by mark.korda@myfairpoint.net on December 5, 2023 at 17:47:07:
I have an ST35 (the basic shoebox) and thru years of use I've found that if it's the stock circuit, it's sensitive to the matching of all four 6BQ5s. This is because the stock circuit is cathode biased using only one resistor for all four finals. Although there are a few technical benefits of biasing this way, it pretty much demands a matched quad of 6BQ5s. The ST35 manual notes this but underplays the need. Proper tube matching for a design like this should include both bias match and somewhat less importantly, transconductance match. If the amp is otherwise in good condition, first thing I'd check is bias match for all four 6BQ5s. Another alternative fix is to operate the amp only when there's enough ambient light to mask all glow. ;-)
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- RE: Dyna ST-35 / Tube Glow - Steve O 19:44:45 12/05/23 (0)
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