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hi brian. i actually know very little about tube amps. the LSS was my first in 20+ years. if it was any other problem, i would have been clueless. i signed up to this board just because of your question, now i love it. so thanks to you too. did you notice any difference in tone? take care, Bob.

hello, tiger roach my tubes were still under warrenty when i had your problem. my service guy put a 5Y3 GrooveTube in for free. there's no GT or GB or anything else on the tube. just 5Y3. sounds beautiful :D rebob

i had the same problem with out a lightning storm. the service guys were stumped. turned out to be the rectifier tube. this tube works for 5-15 watt modes but a diode runs the 30 watt mode. thats why it still plays in 30 watt mode. replace that baby and all should be fine. good luck, rebob.