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RE: Lux

Posted by bcherry on October 4, 2007 at 19:55:28:
Hi Michael
The power transformer has all the taps for 2A3/45 etc B+ and filament. The only thing is there would be some tweeking of voltages on the interstage section to adjust the bias on the grid of the power tube to maintain operating points. Also the WE connection caps would have to be adjusted to match the gain of the power.
12W: Most of the hi-eff speakers I know can handle >20w. A little extra power just means more headroom. The 300B itself is run quite conservatively : anode to cathode is about 350v x 80ma = ~28w.
The 12w comes from the way the reactive interstage works. Usually when the 300B runs out of steam the wave form flattens and more input doesn't give much more. The Lux starts to flatten out much more gently and is pretty linear up to about 12.65watts. Subjectively it gives more dynamic headroom; it can be heard.
Regards
Brian

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