luekemeyer

First question.. Other than the power being on and the standby on, does it matter where the front pots and switches are set?

I have my amp on, and I measure 87mv dc from the center (gnd) to the right pin. I have 0 mv on the left pin.. Tube(s) bad??? If so, what affect would it have on the output to confirm??

Thanks,
John

senjax

I am having the same issue with my DSL 50 I posted a similar question Saturday. No one has chimed in on it yet.. Are your tubes still heating up? Mine are, that is what I cannot figure out, why the tubes would be glowing but not putting out any voltage..good luck

luekemeyer

I'm pretty sure it is the tube that is bad. The heater is on a different circuit and can still be heating yet the the grids are damaged. The guy that sold me the amp said that the HT fuse blew a few months ago... I'm pretty sure that is when the tube failed. I have new tubes coming in a day or so from Eurotube. I will let you know what I find. If it is a circuit issue, I will troubleshoot and determine was component failed (cap/resistor) and post. I know that the DSL have a bias drift problem that can cause the tube to fail due to severe drift. We'll see..

luekemeyer

I just changed all of the tubes and the bias voltage is back. The old power tube(s) were bad. The amp sounds great. Thanks to Eurotube for great service. I put a picture in the gallery of the calibration of the bias..

senjax

I think we both took the same path, I to put new tubes in and it cured the problem, a big thanks to euro tube as well.

luekemeyer

Good news. We are both back in business..