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anyone can explain this? (amp revival)

Ok so last week, my johnson reptone 15b (crappy amp) fell out of a car. When i plugged it in the wall, it wouldnt power on.

My electrical engineer brother openend it and tested the voltage, putting one probe on the ground and the other one on the power line before it going into the transformator. The amp magically powered on and now it is working in mint condition.

I had inspected it before this, and there wasnt any sign of unsoldered cable or anything. My brother just revived it by testing if there was current passing in it.

Now, he is an electrical engineer and cant explain the phenomena himself, as testing the voltage basically does nothing to the circuit.

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If anyone has a clue as to why this hapenned, id be glad to hear what you have to say.

But anyways, my real point here is that im looking for a new amp, since this one is pretty much a pile of brown smelly dough, and i was serious about replacing it before it came back from the dead.

I went to some music store and tried some amps, i liked the Peavey max 115, which was selling around 300, then on the internet i saw what i think is the older version of this same amp, the basic 115, which i could bid on for a hundred buck on ebay.

Anyone thinks there should be a better amp than this one for me to look for? I dont mind buying used... in fact i dont want to pay much more than 4-500 bucks, possible less than 300 if theres something sufficient to play strong enough to hear myself on a drummer, and clear enough that it doesnt sound like a big fart.

Thanks for your advices :)
 
Something inside is probably broken, could be a solder joint or a trace. Jiggle the amp and the current will flow, jiggle it again and it won't, the classic 'intermittent problem'. One thing you can be sure of, it will choose the worst possible time to go down again. The only fix is to test every trace and connection in the power supply circuit.
 
Something inside is probably broken, could be a solder joint or a trace. Jiggle the amp and the current will flow, jiggle it again and it won't, the classic 'intermittent problem'. One thing you can be sure of, it will choose the worst possible time to go down again. The only fix is to test every trace and connection in the power supply circuit.

Exactly what I was thinking

I have a Laney VC30 guitar amp with a similar issue, but it NEVER malfunctions when being checked out and tested by a tech.

But I know the loose connection is in there somewhere, near the tubes because when it does malfunction I am able to affect it by pushing against the tube assembly