![]() Two I fried, the other two I tested and they work.so I'm guessing what you got from small bear was good. I just got four of these myself from small bear a few weeks back. I then tested that IC in a known working 9v bi-polar PS.and it was providing erroneous voltages.so.I burned out two of them this way before I figured that out. I later found that if I increased the amperage from my bench PS, the tube heaters would glow.and I measured the amps during this process.ended up somewhere around 200 - 350mm for the heaters.too much for the 1054.but I wonder if the 7660 would work? At this point the 1054 IC in the PS got so hot it burned my fingers. The moment I put the tube in, the LED went away. This pedal comes to Guitarma from the personal collection of JHS founder. It shows plenty of wear - scrapes, scuffs and velcro residue - but functions as it should and sounds killer. what I found initially is that if my tube was not plugged in, my led on the PS lit but I got no sound. Check out this super cool, Good+ condition Tube Works Tube Driver. I don't have any 7660s but I plan on building a bipolar power supply based on what's on the schematic to rule the PS out.
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