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Re: Sharp cutoff / Variable mu

11/14/2004 6:58 PM
Darren
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Re: Sharp cutoff / Variable mu
Also any kind of attempt of an explanation at designing pentode preamp stages would be good!! Circuits I've built from known guitar amps all seem to bias with the anode nowhere near 1/2 B+, usually more like 1/4, so the usual triode rules seem to not apply. I biased a Vox EF86 circuit to 1/2 B+ and it sounded awful!  
 
I do recall a clever circuit that had a gain control in the screen circuit, also...  
 
these pentode preamp things are intriguing me atm!!!!  
 
--  
Darren  
New Zealand