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Old 3rd July 2004, 01:56 AM   #11
lubbie is offline lubbie  Canada
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I'll do one better.. Here is a link to a early version of the amp.. Later versions had slight mods.

http://ns.netlynx.us/audio/phaselinear/pl400/PL400.gif
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Old 3rd July 2004, 03:11 AM   #12
Eva is offline Eva  Spain
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This circuit employs tricky feedback. It has two pole-zero networks so open loop gain may drop at a slope slighty higher than 6dB/oct. It also features direct feedback from the VAS collector to the inverting input and this may be done in order to avoid a miller capacitor. At first sight, it looks like the designer got the maximum gain-bandwith product available from those transistors without compromising stability
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Old 3rd July 2004, 03:32 AM   #13
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Try a shunt capacitor in series with a resistor.
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