sifusteve

psarkissian, Thank you for your reply and answers. I have taken the processor board into my own work where I have SMT rework tools and a nice bench microscope. After reflowing almost all of the solder joints, replacing some electrolytics, performing a thorough cleaning with rubbing alcohol, placing a heatsink with thermal tape on the DSP and Codec chip, the board and amplifier seem to be working. I managed to play through it for about 1 hour without incident where before it would take only 10-15 minutes for the board to act up cease to work. Thanks for the advice and direction.

I managed to acquire a MK1 (I believe) Spidervalve 212 that I absolutely love. However, it appears as though the DSP chip may be failing and from what I gather may be unfixable. When it works, it sounds lovely. From what I can tell, the power amp stage looks good. I just replaced both preamp and power amp tubes with 12AX7 and a matched set of Sovtek 5881s. Biasing on the power tubes is ~32mV, and the amp has never been turned on without a speaker load. If the DSP board does fail, what options do you think I have? I would love to continue to use the power amp section of this device, but I want to do it correctly.