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RE: Inline bias tool recommendation? Weber Bias Rite?

Posted by nsgarch (A) on October 21, 2007 at 12:33:03

In Reply to: Inline bias tool recommendation? Weber Bias Rite? posted by Tim G on October 21, 2007 at 03:53:33:

Here are some other manufacturers. I haven't tried any myself (yet) as I'm still using my mint little 6000A. But I am beginning to think (and I invite differing opinions on this) that:

1. Plate (or is it cathode?) current is somewhat more important for matching tubes (both power and signal tubes) for audio performance, than measuring transconductance.
2. It's more useful to measure tubes under actual load currents/voltages.
3. It is better if tubes can be measured operating in pairs or quads, than one at a time. (I'm thinking of the Maxi-Matcher unit here.)

Only few very expensive tube testers provide these capabilities (that is if I'm correct in these assumptions.) Anyway, here's my list including the one already mentioned:

http://taweber.powweb.com/biasrite/br_page.htm

http://www.amp-head.com/ (a few different products)

http://www.biasking.com/index.html

http://www.transcendentsound.com/tube_analyzer.htm (interesting unit, kit only)

http://www.vacuumtube.com/toppage31.htm (expensive and only for twin triodes.)

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