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Does anyone know how I can reach Mark? He did a great mod for me but the amp isn't working. Jewel light comes on but no sound and no tubes lighting up. I tried the number I had for him but it's someone else's now? Is he still living in that house in North Hollywood? Please let me know...

I bought a used Ampeg VL-502. It came with old 6550's and the amp has a bias switch to accept EL-34s. Bought some Groove Tube EL-34s, but they wouldn't go in all the way. I actually snapped off the guide pin (and ruined the tube unfortunately, heard a "whoosh" nosie which I assume means I...