Question about Crate Music
I was playing a club gig the other night with my 2-year-old Crate V16 Palomino 1X12. Had the Gain cranked to 5 o'clock, the Level cranked to 12 o'clock, Treble Mid and Bass set flat at 12 o'clock, and my MIJ Strat Volume at 7. The amp just cut out on me...no hiss, no buzz, no nothing. Walked over to the amp, and the power switch had flicked itself to ''Off.'' Flicked it back to ''On''...nada. Unplugged, replugged...nada. Waited overnight, replugged...nada. I have the board schematics, and am attempting to self-diagnose, as I live in Saudi Arabia; haven't gone to the local amp techs (mostly Filipinos who know Yamaha solid state amps real well...).
Things I can think of: 1) Power transformer headed south on me.
2) One or more power tubes (2 EL34's in this config) zorched. 3) The PT fuse zorched. 4) All of the above. Haven't opened the back of the cab to look yet. Any thoughts would be most appreciated, as I will be back in the States in a month for parts or replacement. Ron
Start easy. You could have a bad power switch. Do you get any kind of indication of any life at all, like tube filiments or front panel indicators? If the fuse is blown you have a fault that is drawing excess current, in which case you can check the rectifiers that create your bias voltages, yank the output tubes to see if they have an internal short, less likely would be a shorted filter capacitor (although I have seen it). You could also have a bias problem on the output tubes that causes them to draw excess current and likely makes the tube(s) glow bright red before popping the fuse. If this is the case, look for shorted or leaky coupling capacitors and burned bias resistors, or maybe just a tube with internal shorts, and you will likely have junk tubes as a bonus (they don't take kindly to glowing bright red- meaning a glow that is far more intense than the soft glow of the filiments). If the fix gets more involved than all of this, give me your email addy and we can get hard core.
Posted on May 17, 2009
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Posted on Jan 02, 2017
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