AI200

rmgvs · 11th June 2001, 08:50 AM

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

rmgvs · 11th June 2001, 08:52 AM

Sorry, I have mistakenly opened a new thread.

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11th June 2001, 08:50 AM	#1
rmgvs diyAudio Member 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

11th June 2001, 08:52 AM	#2
rmgvs diyAudio Member Join Date: Apr 2001 Location: Netherlands	Sorry, I have mistakenly opened a new thread.