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AV8 and AV15 Vaic tubes
AV8 and AV15 Vaic tubes
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Old 29th March 2004, 07:35 PM   #1
Alain Favret is offline Alain Favret  France
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Default AV8 and AV15 Vaic tubes

I could not find the parasitic capacitances of these tubes; not at Vaic's website
Does anyone knows it ? I'm thinking about these as alternative valves in a 2 or 3 stages 2a3 SET amplifier.

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Old 30th March 2004, 07:04 AM   #2
MaciekP is offline MaciekP  Poland
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I can't help you with that, but I have built a SET with AV8 as a driver. This is a fine tube with 300B heater ad similar to PX25 anode, but why to bother, if you can buy 10y/VT25 for less money (about 40$/each).
At 260V/30mA you have almost the same Rp and mu as Av8.
10y has better/more HF. Av8 has better LF. One can argue this is a matter of Rp of a tube, but I think it has something in common with 10y tungsten heater.

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