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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: To worry about which variety of 12AU7 is better, seems a bit pointless to me posted by Mechans on July 10, 2015 at 05:25:34:
"I don't understand why so many amps are designed to use that tube, if they are so bad."
In a word, money. The more linear Noval twin triodes, whose electrical characteristics are more or less the same, use twice as much heater current. Even if we postulate that tube costs are =, doubled heater current draw increases the cost of power "iron". Corporate "bean counting" is anything but a new phenomenon.
The 12AU7 is acceptable in the "concertina" phase splitter and voltage follower roles. In those jobs, the type's fundamental non-linearity is (more or less) a non-issue, due to local current NFB. Voltage amplification is a task the 'U7 triode is bad at.
Eli D.
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Follow Ups
- RE: To worry about which variety of 12AU7 is better, seems a bit pointless to me - Eli Duttman 11:33:50 07/10/15 (1)
- OK that makes sense.sort of? - Mechans 13:51:50 07/11/15 (0)
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