SET Asylum

You guys are missing my point and its not ground breaking ...

58.171.47.127

In Reply to: RE: I'd think 30W out is an impossible number for 2X 300B! posted by Thomas Martens on March 03, 2008 at 18:17:39

Proper A1 operation is limited only by the onset of grid current above zero grid volts. Most see 0V as THE limit but if you can drive the grid into positive (A2) territory you can achieve greater OP swing making 30W for a pair of 300Bs quite possible at relatively low distortion (sub 5% 2ndH with no global NFB). What's needed is a plate voltage a little under max and a P-P grid swing of just on 260V, around a bias voltage of around -97V with a primary load of about 2.5K. Dissipation is only around 30W for each tube. The only real challenge is the driver but a DC coupled White CF will easily achieve the transition to grid current without detection. If power or efficiency is the goal no need to go PP because the first 20W (for the pair) is all in A1 as for any normal SET!

Rgds,
Naz

Follow Ups:

Oops - sorry - Paul Joppa 09:28:22 03/04/08 (1)
- RE: Oops - sorry - Naz 22:40:26 03/04/08 (0)

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