Hi,
I've had a Fishman Loudbox Mini acoustic amp for 3 years from new and it's given sterling service until a month ago when mid-gig it smelt "hot" and slightly acrid, then died. We were playing a small local festival gig in a pub with "dubious wiring" and I suspect this was the catalyst as a Yamaha powered monitor also cut out earlier in the day? I replaced the internal slow-blow fuse by the power socket but that blew straight away.
I've been in touch with Fishman in the States who were very helpful and put me in touch with UK distributor JHS.
JHS were less helpful as they've just given up distribution of Fishman gear so, they put me in touch with 440 Distribution who are in the process of taking on Fishman gear for the UK.
I've forwarded all details to Tom @ 440 Distribution but there's not very much happening?
Who's my best bet to get it fixed?
I'm in North London South Herts and usually go to Malcolm Hine in Edmonton.
Daft question possibly but thought I'd ask on here first.
Cheers gang,
C
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Sorry I can’t be more help...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
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http://lumberjocks.com/projects/312938
The two important pics -
https://s3.amazonaws.com/vs-lumberjocks.com/or7q4wy.jpg
https://s3.amazonaws.com/vs-lumberjocks.com/or7q5qw.jpg
Which show a conventional linear power supply (with a rather cheap-looking PT) and what appears to be a Class AB power section.
If so it's probably repairable, even without manufacturer-specific parts. The usual suspects would be either the power transistors, rectifier or possibly the PT if it's had a mains spike.
Whereabouts are you based? One of us could look at it and probably tell you within a few minutes if it's likely to be economically repairable.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The only one of these I've seen was simply a broken jack socket.
Looks like it would be fixable without service documents.
I'm in Tottenham, north London.
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The exact smell of burning would have been quite identifiable to some of us though - transformers smell different from semiconductors .
The PT would actually be the simplest to fix, by the look of it - it's just a single centre-tapped winding on the secondary side (the yellow and blue wires), with a dual-115V primary (brown/blue/black/white), so if you can't get the OEM part any other PT of the right secondary spec will be fine.
Did it 'thump' through the speaker when the second fuse blew? If not it's more likely to be the PT or the rectifier than a transistor. Although the problem with shorted transistors is that sometimes they can take the speaker out as well, which then starts to get expensive...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
https://www.ebay.co.uk/itm/EBB-150-Mosfet-Power-Amplifier-Module-125W-RMS-Audio-Disco-PA/121457218844?epid=682645701&hash=item1c476a151c:m:mTacdPYiR_nhl51hWAaTJXg
No thump, just smell then noticed it wasn't working.
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Not conclusive either way - as DJH says a blown power transistor (or both) is still the most likely cause, and if both are shorted it wouldn't thump either.
But if it *did* thump, you can probably rule out the PT at least.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Cheers,
C
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