Musicman 65 reverb power problem?

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Author Message   tayloredgifts@aol.com (guitarman) Username: guitarman Registered: 10-2007 Posted on Monday, October 29, 2007 - 05:26 pm:    hello, problem is loud (humm) without guitar plugged in. volume control makes no difference. (can hear slight guitar sound in back of humm) when plugged in. then after 1 min i lose power to tubes (then no nothing) . any ideas? thanks   Mike Kaus (mm210) Username: mm210 Registered: 05-2006 Posted on Tuesday, October 30, 2007 - 06:14 am:    Does the fuse blow or just go out? When it cools off, does it come back on? Also, which chassis(amp) are we talking about? With or without PI tube.   tayloredgifts@aol.com (guitarman) Username: guitarman Registered: 10-2007 Posted on Tuesday, October 30, 2007 - 10:51 am:    fuse does not blow .it does come back on after ten mins or so. it is a 65 reverb head .that is all the info i have . thank you   Giorgio (giorgio) Username: giorgio Registered: 07-2007 Posted on Tuesday, October 30, 2007 - 05:08 pm:    Have you replaced old electrolytic caps?   Mike Kaus (mm210) Username: mm210 Registered: 05-2006 Posted on Wednesday, October 31, 2007 - 06:28 am:    I'm going to go with bad caps OR a bad connection at one of the heater wires. Get's hot, tubes go out. OR PS transformer taking a whizz.