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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: They're building it impossible to work on posted by Alpha Al on February 12, 2015 at 06:29:16:
I have a pair of MB-450s that have served me well since 2001. A couple of years back, I had an issue where not only the B+ fuse would go, but immediately one of the eight 6550C tubes would go supernova. Since I keep the output tubes following replacement, I had quite a few spares. I ended up smoking three more fuses and tubes before emailing VTL.Very quickly, Bea Lamm sent me an email for a couple of things to check. Mind you I'm not an EE, but have built Dyna kits and have a VOM and capacitance meter. Removed bottom cover for access to all the circuitry. Sure enough, one of her suggestions was to check the value of the output caps. One had failed. Once I relayed that information, she sent me one gratis. The cap's leads were pre-bent and precisely trimmed for fitment. It took me very little time to get it working like new.
Another area of variance I've found is ease of setting bias. I used to own an Audio Research VT100 that involved quite a procedure using matched quads. Inmate Abe Collins posted a wonderful pictorial of what to do. By contrast, the VTL allows for individual tube biasing and is easily accessible from the top plate. Admittedly, some of the newer ARC amps have front panel meters and bias points. The current version of my amp has auto bias so that is no longer an issue anyway.
Edits: 02/12/15
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Follow Ups
- I can tell you who it likely wasn't - VTL - E-Stat 14:19:14 02/12/15 (4)
- to be fair THAT Audio Research amp is direct coupled from front to back... like a SS amp~nT - Cleantimestream 17:23:32 02/14/15 (2)
- RE: to be fair THAT Audio Research amp is direct coupled from front to back... like a SS amp~nT - Steve. 08:53:03 02/15/15 (1)
- RE: to be fair THAT Audio Research amp is direct coupled from front to back... like a SS amp~nT - Cleantimestream 11:47:45 02/19/15 (0)
- RE: Pray there are no components on the other side of that cb - DAK 12:17:07 02/14/15 (0)
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