crwdns2934241:0crwdne2934241:0 Bryan Bishop

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Amp whistles on power down

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I have a 3 year old Koch Jupiter 1x12 hybrid amp. It now gives a 3 second whistle as it powers down shortly after I turn it off. I changed both 12AX7 tubes and it is still happening. Any help appreciated!

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Guitar Amplifier

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