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The Beast with a Dozen Jfets
The Beast with a Dozen Jfets
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Old 24th June 2013, 04:31 AM   #31
wrenchone is offline wrenchone  United States
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Join Date: Feb 2004
Location: Silicon Valley
Well I tried hooking up the global feedback tonight, and the Beast didn't like it either way - can you say motorboat? Also, though the thing does play music open loop with a CD player, the sound is not as clean as I'd like, and when I switched in another player, it started picking up German-style oompah music from some radio station. The amp seriously needs some bench time with a scope, and the gate resistors on the paralleled fets probably need to be a lot bigger.

I had this problem before on the Shrine amp with the cascoded fet input stage wanting to take off - the situation is no doubt worsened by all those fets in parallel. The fets are probably yakking away amongst themselves at a few MHz - maybe more than a few....
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