Oh, I wish I was so worried about my tube amplifier! Buddy, don't worry so much about your amplifier. Even if some lamps don't work, you can give them to specialists who will replace them. The main thing is that you like the tube sound this amplifier gives out from your guitar!
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I believe his tube amp is giving out sound from a pair of speakers in his stereo system for music reproduction, not for music making (guitar).
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