Concert Lead Circuit Breaker

[georgec64]

Hello!

First time poster here and new to amp repair so bear with me...

Recently purchased a re-serviced silver face concert lead. Worked great until the other night when it turned off while I was playing it at a moderate volume. I figured it could be a problem with the fuse getting burned out which has happened to me in the past with other amps. The Concert Lead has a circuit breaker and when I took it out, it was very clear it was broken. The button was stuck and there was clearly a broken piece inside of the circuit breaker box.

According to this schematic: http://music-electronics-forum.com/attachments/26223d1383765388-sunn-concert-lead-pwr.gif the concert lead uses a 4.5amp circuit breaker (although I do not know if there is a difference between the red face or the silver face's circuit breakers). I bought a 4amp circuit breaker (all they had at the hardware store) and installed it. The amp powered on an immediately tripped the circuit breaker.

MY QUESTIONS: Does the silver face concert lead actually use a 4.5 circuit breaker? I think those are going to be harder to find so will a 5 amp fuse work as well? Am I at a serious risk bumping it up to a 5 amp circuit breaker? (they only had 4 and 5 amp circuit breaker / fuses at the hardware store).

Sorry if I sound like a dummy, I am fairly new to electronics. Obviously I should try a 4.5 amp Circuit breaker but I need this fixed this week and I am not even sure if that's the right ampage. Maybe you all know the exact circuit breaker I need. Thanks friends. 

[loudthud]

Your amp probably has an internal problem that is causing the circuit breaker to trip. Unless you are skilled at trouble shooting solid state equipment, you should take the amp to a qualified technician.

[Isaac]

When I was a technician in the Navy, we were allowed to replace a fuse exactly once before beginning troubleshooting. But we were never allowed to substitute a different value. My point is that the 4.5 amp circuit breaker was likely chosen for a reason. A 4 amp breaker would likely pop too often, making the amp unreliable, and a 5 amp breaker might allow enough current to flow to damage the amplifier. It's possible that the circuit breaker was faulty and that replacing it will solve your problem, but I agree with loudthud that it's not the most likely answer.

4.5 amp breakers are available, so, if you want to replace the breaker, you could. but if it pops again, find the cause.

[georgec64]

Cool, thanks everyone. I'll definitely have to take it to someone, but was hoping I could fix it before a tour I have coming up. I definitely think the circuit breaker is the problem though because before I tried wiring in a new one, the amp would not power on at all. So at least now it powers on for one second and then trips the circuit breaker. Meaning that if I can get the right circuit breaker, it will be fixed hopefully. Also, the venue where the amp broke apparently has shitty electricity so maybe that had something to do with it.

[loudthud]

High power guitar amps only consume maximum current when they are played at maximum volume. When not making any sound, they consume only a small fraction of maximum current, perhaps 1/10 as much. (Tube amps a little more.) If your amp trips a 4 Amp breaker when it is first turned on, there is something wrong with the amp.