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Discussion Forum for Mesa Boogie Products
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 Post subject: Re: Mark III died again
PostPosted: Mon Jul 11, 2016 6:10 am 
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Donating Member

Joined: Thu Jul 09, 2009 1:41 am
Posts: 380
Location: Canberra, Australia
Hi Casey, that sucks that it's still not behaving..

Yeah, John at Pro Audio is a really nice guys and knows Boogies v well.. Getting it back to factory would certainly locate the fault.. but at wot cost...!!

I'm not suprised its not showing itself visually as yet - and even if the source of the heated part or a bit of smoke leakage is found, there's no guarantee how far else through the circuit the root cause is..

But I'm a sucker for fixer-upper amps.. problem is I rarely sell them...

A Blue stripe Mk 3 would be kinda cool to keep company with my others though..!!

Is it head or combo and what kinds $'s would U be thinking ?

PM or email if U like so we don't hijack the thread - although I'll certainly post what I find if it make it's way to frigging cold Canberra..!!

Dave

_________________
Mk I,export,GEQ,cream
Mk IIA,exp,rev,cream
Mk IIB,exp,rev, tweed
Mk IIB,exp, rev,GEQ,simul, black
Mk III head,rev,GEQ,cream
Mesa Studio 22+, fan
Kitty Hawk M1 head
Fender 75, exp, 1973,15".
Fender 6G6A Bandmaster 1962
Fender AA763 Bandmaster 1964


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 Post subject: Re: Mark III died again
PostPosted: Tue Jan 24, 2017 6:27 pm 
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Mark II

Joined: Tue Nov 29, 2011 2:52 am
Posts: 61
!!UPDATE !!

So I took my boogie back to B J amps here in Brisbane Australia - as was thought he had to pull the board to diagnose the problem - but he found the problem

A big blob of solder had formed either from factory (which he thinks where it was) or a previous repair, this blob was so close to the pins that depending on heat , vibrations, moisture levels etc could actually short on the inside of the preamp valve base. The pre amp valve base is so tiny but this small blob none the less is the culprit

Image

He also shorted one valve in the process so I replaced a set - also in the lead circuit there was a little black component - which I cant remember the name of is - and now all fixed, no crackling - no bad vibes, just awesome awesome tone!!

Casey


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