Hello again-
I've got a Hot Rod Deville here that's acting up. The 470ohm1w resistor in R61 was blown so v5 wasn't getting any bias- I replaced that and re-biased and the amp seemed to be fine. However after playing for about 5 minutes on the yellow channel it makes a horrible noise and the bias jumps up from 60mV to over 300mV or 25mA to 190mA. Throwing it back into standby and back will correct the problem for a few minutes. If anyone could give me a pointer or two on why this might be happening I'd appreciate it. here's a link to the schematic:
http://www.schematicheaven.com/fende...od_deville.pdf
Thanks.
I've got a Hot Rod Deville here that's acting up. The 470ohm1w resistor in R61 was blown so v5 wasn't getting any bias- I replaced that and re-biased and the amp seemed to be fine. However after playing for about 5 minutes on the yellow channel it makes a horrible noise and the bias jumps up from 60mV to over 300mV or 25mA to 190mA. Throwing it back into standby and back will correct the problem for a few minutes. If anyone could give me a pointer or two on why this might be happening I'd appreciate it. here's a link to the schematic:
http://www.schematicheaven.com/fende...od_deville.pdf
Thanks.
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