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Short and Long plate tubes

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ZoolooterZoolooter Frets: 887
in Amps
What are the differences between a short and long plate tube, say a 12au7? And why would you choose one over the other?
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Comments

  • CirrusCirrus Frets: 8493
    As for the actual physics and electronics of it, I have no idea, but I have a Brimar longplate 12ax7 and it was a bit more lively sounding - not necessarily brighter, just felt like it had a few more harmonics packed in. It also went microphonic pretty fast.
    Horizoneer

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  • SassafrasSassafras Frets: 30291
    You might get a better response if you referred to them as valves.
    Which is what they are in Britain. ;)
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  • ICBMICBM Frets: 72407
    They're just different-sounding. Valves are made by different manufacturers with all sorts of combinations of plate length, width and shape - there's really no rule about how they affect the sound. There is some evidence that longer plates might be a bit more microphonic, but that's about it.

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