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Discussion Forum for Mesa Boogie Products
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PostPosted: Tue Mar 07, 2017 3:56 pm 
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Bottle Rocket

Joined: Sun Feb 09, 2014 4:16 pm
Posts: 10
No worries about the confusion. I'm replacing one of the 220uF 300v
caps. Also the EV 12 weight has caused the baffle some issues. Will upgrade
with stainless steel screws with securing on the backside. Which one are
the B+caps? And really appreciate the feedback from both the board and Mesa customer service.


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PostPosted: Tue Mar 07, 2017 7:08 pm 
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Mark III

Joined: Tue Sep 20, 2011 11:15 am
Posts: 169
uberdave wrote:
Which one are
the B+caps? And really appreciate the feedback from both the board and Mesa customer service.
The B+ caps are the 2 longer black caps on the power supply board along with the 3 blue sprague atoms.Those Spragues look new so you probably only need to change the black ones.They should be 220uf's.
edit:Just noticed you said you were going to change just one of the 220uf caps?I think it would be wise to replace both and go for Spragues if you can or Mesa can get you the BMI caps that they currently use.


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PostPosted: Tue Mar 07, 2017 7:15 pm 
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Bottle Rocket

Joined: Sun Feb 09, 2014 4:16 pm
Posts: 10
Actually when we pulled the chassis we discovered that one of B+ caps wiring had broken off.
Which would explain the amp cutting sound. Ordered a new F&T 220uF 300v cap.
Hopefully that and installing a new AC pwr cord fixes the issues. Thanks again!


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PostPosted: Tue Mar 07, 2017 7:35 pm 
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Mark III

Joined: Tue Sep 20, 2011 11:15 am
Posts: 169
uberdave wrote:
Actually when we pulled the chassis we discovered that one of B+ caps wiring had broken off.
Which would explain the amp cutting sound. Ordered a new F&T 220uF 300v cap.
Hopefully that and installing a new AC pwr cord fixes the issues. Thanks again!

I didn't know they were F&T's.I thought they were old caps and only the 30uf's had been replaced.That's good you only need the one cap then.
I'm just curious do those lifted tracks around the power tubes pose any problems?


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PostPosted: Fri Mar 10, 2017 7:43 pm 
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Donating Member

Joined: Thu Jul 09, 2009 1:41 am
Posts: 375
Location: Canberra, Australia
Couple random thoughts..
The sby switch is at an odd angle - ? mounted rotated or mech is broken/breaking..
New white cap off phase inverter.. assume leaky cap replacement ?
Filters yr pointing to are bias and look orig - forty yr old... replace.
Someone might get date codes off the Atoms - I'm thinking Sept 2013 but could be wrong.
I'd secure +/- shield the thin red supply to SBY as it crosses the filters.. Loose mains leads are scary..

Lovetoboogie - in yr pic there's a ?earth wire crossing yr B+ lower part of pic - looks nasty close to the B+.. or camera angle?

Congrats on a bloody nics amp..!!

PS - filter cap missing not likely culprit to "cutting sound"..

_________________
Mk I,export,GEQ,cream
Mk IIA,export,rev,cream
Mk IIB,export,rev, tweed tolex !!
Mk IIB,export, rev,GEQ,simul, black
Mk III head,rev,GEQ,cream
Kitty Hawk M1 head
Fender 75, export, 1973,15".
Fender 6G6A Bandmaster 1962
Fender AA763 Bandmaster 1964


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PostPosted: Fri Mar 10, 2017 10:19 pm 
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Mark II

Joined: Tue Mar 25, 2014 10:14 pm
Posts: 76
Location: New York City
McBarry wrote:

Lovetoboogie - in yr pic there's a ?earth wire crossing yr B+ lower part of pic - looks nasty close to the B+.. or camera angle?




Good eye...but it's the angle. There is a good bit of clearance there as it crosses the B+ rail. That was original Boogie dress! ;0


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PostPosted: Mon Mar 13, 2017 11:11 pm 
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Bottle Rocket

Joined: Sun Feb 09, 2014 4:16 pm
Posts: 10
[quote="McBarry"]Couple random thoughts..
The sby switch is at an odd angle - ? mounted rotated or mech is broken/breaking..
I'd secure +/- shield the thin red supply to SBY as it crosses the filters.. Loose mains leads are scary..

Guess what broke tonight? Standby switch, bloody hell! Any clue what type of switch?
Carling SPST ?
We secured +/- shield the thin red supply.
I have a bunch of old and new pre amp tubes and will probably be ordering a couple of TAD 6L6 STR next week.
Anyways thanks for all the inputs. Appreciate the knowledge!


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PostPosted: Fri Mar 17, 2017 6:03 am 
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Donating Member

Joined: Thu Jul 09, 2009 1:41 am
Posts: 375
Location: Canberra, Australia
Bummer.. luckily they're plentiful..
The exact Carling part no is 110 - 63.
63 is the short bat - the next up is the 73 which is considerably longer. Avoid it..
I'm a fan of Sylvania 6L6's - they're a little hard to come by over this side of the pond though..

_________________
Mk I,export,GEQ,cream
Mk IIA,export,rev,cream
Mk IIB,export,rev, tweed tolex !!
Mk IIB,export, rev,GEQ,simul, black
Mk III head,rev,GEQ,cream
Kitty Hawk M1 head
Fender 75, export, 1973,15".
Fender 6G6A Bandmaster 1962
Fender AA763 Bandmaster 1964


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PostPosted: Thu Apr 20, 2017 11:31 pm 
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Bottle Rocket

Joined: Sun Feb 09, 2014 4:16 pm
Posts: 10
Getting ready to sell the Boogie
Image


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PostPosted: Thu Apr 20, 2017 11:33 pm 
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Bottle Rocket

Joined: Sun Feb 09, 2014 4:16 pm
Posts: 10
Image


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