Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel

[TomCarlos]

On the Mesa Boogie .50 Caliber Amp, the clean channel is just fine. The power amp is obviously working great. The problem is with the Overdrive channel- the output is faint. Any ideas on what the problem might be or where to begin looking?

Thanks, Tom

[chipprogr]

replace V1 preamp tube, its sole function is overdrive, when in clean channel, this tube is bypassed.

[TomCarlos]

replace V1 preamp tube, its sole function is overdrive, when in clean channel, this tube is bypassed.

Ok, I will give that a try. I am studying the schematic tonight.

Tom

[TomCarlos]

Well.... I swapped out V1 but the same problem. Something I didn't notice before- the EQ Section is not working when in the Overdrive mode. So I need to look at that more carefully, seeing how V1 feeds the EQ section.

[TomCarlos]

This unit was taken for service at a local shop. It needed a couple of caps, several tubes, and a replacement footswitch input jack. All is working now. Thanks everyone for your input.