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Old 11th June 2001, 09:50 AM   #1
rmgvs is offline rmgvs  Netherlands
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Join Date: Apr 2001
Location: Netherlands
GRollins,

Thank for the reaction. The stages are C-coupled and they're not leaking. After the first stage and cap however the second half of the paraphase is driven (signal applied to the grid, attached to ground via 100 k resistor). Indeed somehow here is the result a -4 Volts which passes to the grids of the output tubes. It is not the grid that is drawing current however.

If I take the ecc82 (very first stage) out of the amplifier (and effectively make the amplifier open loop) all problems are gone. It has to be a oscillation (I have no scope). But if this is true, all AI200 must have this problem!

Rudy
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Old 11th June 2001, 09:52 AM   #2
rmgvs is offline rmgvs  Netherlands
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Join Date: Apr 2001
Location: Netherlands
Sorry, I have mistakenly opened a new thread.
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