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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: tube matching posted by mark_m on September 22, 2004 at 11:14:27:
Power tubes have several concerns.
First, you must make sure that the cathode can emmit enough current, per tube's spec for max current. That's a very basic test that cheap emmision testers perform.
For tubes that run in parallel or push-pull, you must also match the gain curves THROUGHOUT the operating points of the stage. Easier said than done.
Mutual conductance testers only tell you one operating point!
It's like saying a car engine is great after hearing it at idle only... what about the rest of its operating range?!
There are some computerized testers that could help you with curve matching, and those are the right instruments to get, if you are VERY serious about your equipment.
Of course, most manufacturers would tell you that the negative feedback fixes all these issues. To an extent, that is correct, but logically you can imagine different scenarios where one tube carries significantly more current than the other (like in your amp!). Does that seem like a "healthy" situation?!
You be the judge...
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Follow Ups
- Serious tube matching - serus 10:44:37 09/23/04 (1)
- tube matching - mark_m 16:19:17 10/06/04 (0)
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