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Old 5th November 2007, 07:22 PM   #1
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Join Date: Oct 2004
Default Ultralinear pse

Hi all

Surfing on the web Iíve found a schematic of an interesting pse amplifier. In the output stage there are three 6550 in UL. Iíve never seen before such a solution, so Iíd like to know what you think about the connection of more than one screen grid to the same UL tap (43%).
Do you think it could produce any problem to the local feedback mechanism?

Thanks

Mark
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Old 5th November 2007, 10:54 PM   #2
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Join Date: Apr 2004
Location: Monroe Township, NJ
Mark,

I don't see why it can't be made to work well. The 3 paralleled O/P tubes need to be very closely matched for gm and reasonably well matched for plate current. "Fixed" bias, with an individual adjustment for each tube, allows the idle current for each tube to be set, "perfectly". "Fixed" bias implies modestly sized grid leak resistors. So, low impedance driver circuitry is in order.
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