One-owner Ampeg SVT-3pro in 4-space rack+Alesis 3630 compressor(I'lll go $400 shipped for the head alone). 4+ years old, used regularly in Church(6-8 hrs/week at medium volumes). Always racked, very nice condition. Newish tubes w/approx. 20 hrs. The issue is that in 4 yrears of use, it has mysteriously stopped making sound twice. Lights, power, no sound. Once moving the amp seemed to cure the problem. The other time, toggling the mute switch, again, seemed to 'fix' it. This head has been checked out(after these incidents)by a licensed tech, who could find no apparent problem. I'm hoping someone w/tech experience will grab this, fix it & turn it over for profit- or just use it. I'm of course open to offers, & will gladly answer any questions here or via PM. I'll try to get pics up this evening. Thanks.