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Amp power peak when turning on? Ampeg B2 Question.

J

Jacobus19912017

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Nov 14, 2017
3
1
#1
Hello all,

I have a question regarding my Ampeg b2 head.

Allot of times when i turn the amp on, either in my house, small bar or rehearsal room the fuse of the place tends to jump out. Just to be clear im not talking about the fuse in my amp, but of the venue. Allot of times when i put the fuse back in and i turn the amp on again its fine. But a few day's ago playing at a small bar the fuse kept jumping out, and i had to go over a PA system cause it just wasn't working.

Amp is plugged into my SWR Golitah II, nothing else plugged in, and power is going directly coming from the wall.

Does anybody have an idea of what this could be??
Thanks in advance :)

Greetings,
Jacobus
 
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#3
Jacobus19912017 said:
Hello all,

I have a question regarding my Ampeg b2 head.

Allot of times when i turn the amp on, either in my house, small bar or rehearsal room the fuse of the place tends to jump out. Just to be clear im not talking about the fuse in my amp, but of the venue. Allot of times when i put the fuse back in and i turn the amp on again its fine. But a few day's ago playing at a small bar the fuse kept jumping out, and i had to go over a PA system cause it just wasn't working.

Amp is plugged into my SWR Golitah II, nothing else plugged in, and power is going directly coming from the wall.

Does anybody have an idea of what this could be??
Thanks in advance :)

Greetings,
Jacobus
Click to expand...
Fuses? Really. Where are you playing that they don't have breakers. I haven't seen an actual fuse in a building in decades and decades. Even the hundred year old farmhouse we lived in in PA had breakers. Am I reading your OP wrong?
 
#4
filmtex said:
Fuses? Really. Where are you playing that they don't have breakers. I haven't seen an actual fuse in a building in decades and decades. Even the hundred year old farmhouse we lived in in PA had breakers. Am I reading your OP wrong?
Click to expand...
I suspect he meant circuit breakers as it's rare to see a fuse "jump out",...although, I've seen them explode!
 
#8
Jacobus19912017 said:
Haha yes sorry guys, i did mean breakers (english is not my main language). Thanks for the reply's, i guess i will take it to a repair shop then.
Click to expand...
Good call! This is the type of problem best addressed by a qualified tech, and sooner rather than later.

OBTW no apology needed, your English is clearly better than my skills with a second language. :)
 
#10
Al Kraft said:
I suspect he meant circuit breakers as it's rare to see a fuse "jump out",...although, I've seen them explode!
Click to expand...

Actually, it can happen.

There are circuit breakers that look like fuses with a small pin that comes out of the center. These are used to retrofit breakers into fuse panels. The kind of thing that you find in some old venues. When it trips, the switch pops outward. To reset it, you push the pin back in.

5B08F2FC-7CCE-4E9D-95CB-C3F5F0419597.jpeg
 
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#11
beans-on-toast said:
Actually, it can happen.

There are circuit breakers that look like fuses with a small pin that comes out of the center. These are used to retrofit breakers into fuse panels. The kind of thing that you find in some old venues. When it trips, the switch pops outward. To reset it, you push the pin back in.

View attachment 2812973
Click to expand...
I saw something like that once in an old country/farm house.
 
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#13
Its at the shop now, he mentioned the preamp tube and something about the power feed (once again i dont know the english word for it but we call it power feed here, i know in pc's its called wattage within the power supply unit). Anyway il let you know what it was once i get it back.
 
#16
Jacobus,

This can be fixed quite easily. Your B2 is probably an amp made before 1998.
The B2 has an toroidal transformer which has an high peak current when switched on.
I recently bought an B2 combo with the same issue.
I added a NTC before the power on switch, after that no more problems.

Ampeg did a modification in 1998 by adding a NTC.
I will post some pictures, schematics later.
 
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