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Pentode Driver, SE output, and high frequencies???

65.33.89.219

Posted by maynardg on March 17, 2007 at 14:15:15

Last week, Ron Oehlert was very kind in helping to diagnose a bad transformer heater supply. New tranny and I'm now getting very close.

This is a KT88 SEUL amp. I have 6SJ7 drivers working very well - Fi Primer 6L6 style But not content to leave week enough alone, I am trying to dial in a 717A driver for a SEUL output.

Compared to the 6SJ7, the 717A is bright (different component values of course)- but running the 717A plenty hot. My question is what variables on the driver control the high frequency roll off.

B+=266, Rp=33k, Vp=160, Rg1=100k, Rg2=160K, Vg2=117, Cg2=1uf, Rk=680, Ck=220uf, Vk=3.4.

Rnfb=3.8K with R to ground of 200R.

Thanks to anyone willing to take this on.

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