Using another scope and a DMM, refer to the repair manual and verify whether all power supply voltages and ripple are within spec. Note any voltages/ripple which are out of spec.
Assuming one or more voltages/ripple are out of spec, then perform the low voltage power supply recap.
It would be nice if the low voltage PS was the only issue. However my guess is that your scope has a problem with CH1/CH2 as well.
In any event, the first step always should be to ensure the power supply is working correctly. Good luck.
Patrick Wong AK6C
--- In TekScopes@..., "machineguy59" <machineguy59@...> wrote:
...This convinced me I have a gain problem in both Ch1 and Ch2. I also have a "sawtooth problem" in these same channels. Do you think these symptoms can be related? Would a noisy LVPS mess up the gain in the preamps? Or do you think I have two separate problems that just affect Ch1 and Ch2?
