Re: Mesa Boogie 50+ Caliber problem

On Fri, 16 Mar 2007 21:22:59 GMT, sam booka X2
<My.em@xxxxxxxxxxxxxxxxx> wrote:

sam booka X2 <My.em@xxxxxxxxxxxxxxxxx> tapped the mic and said
news:Xns98DA24756CC47AlbertaClipper@xxxxxxxxxxxxxx:

"bk" <bkahle@xxxxxxxxxxx> tapped the mic and said
news:1171637516.935770.165130@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
That resistor is located in the footswitch supply and provides power
to 3 of the 5 LDRs (LDR 1 - 3).
Your (in circuit?) measurement of "89.4" ohms tells me that it's not
burned open- (fwiw an open here would
disable the lead and mid-boost modes but would not disable clean, so
it is not the cause of your amp being
totally dead (if it is). The value should be 100 ohm. Let me ask you=>
the boogie foot switch has, (and needs to have),
some *internal* series resistance of (iirc) around 3.5K. You haven't
been a naughty boy and have been just using
"just any ol' foot switch, now have you? :-)


Come on guys! Are you going to just ~go~ with the above?
R261 is in the supply that I mentioned, but the post
above is only semi-accurate. Are you going to just "buy" my FS theory?
Let's look at the ckt. drawing and pick it apart? Maybe no one gives a
crap...

I still care! :p

The FS supply, once rectified and filtered, stands at
about 8 to 10 Vdc. So you have that, R261(ldr led current limiting),
4 ldr leds in parallel with a 470 ohm and lastly, a switch closure.
Do you think that the resistor fried because of use of the wrong fs?
(Hint: the Boogie fs ~3.5K is to limit current for the *fs* led.)

Any potential around here anymore for ckt. discussion?
I fully expected to come back here this am & have
my *** kicked. :)

Ok.

bk

No *** kickin' here. I'm the patient... you guys are the surgeons! :p


An update with this thing...

It was the reverb spring that came off at one end and fell across the tube
pins that shorted the R261 resistor. All that stuff that was toasted was in
the reverb section. I wound up taking it to a fellow in Calgary, Canada,
Mike at Guitar Connections. He was referred by Guitarworks in Calgary, the
Mesa dealer there. All their Mesa stuff goes there.

He put some shrink wrap over the tube socket connections to prevent the
same thing from happening again, and fixed up the mess caused by the short.
It cost me about $50 US equivalent, including a checkup.

He says there will be no adverse effects from using a simple on/off
footswitch as was surmised by some. You just won't have an LED, but if you
can't tell, you are deaf anyways. I guess the LED is to freak people out at
gigs so you can blast them right out of the gate when you come off standby,
and wanna know which channel you have.

Anyways, if you like tube amps, check him out at 17th Ave and 17th St SW.
in Calgary. Lots of nice vintage Marshalls, HIWATT's, Fenders, and Ampegs
there in good repair to drool over or even buy if you can get them to part
with them... especially the HIWATT's and the Ampegs.

I'll have to keep that in mind next time I am there.
Of course, I'll most likely be on the bike so that will help keep me
from buying anything.
--
Bob Mann
85 K100RS (traded for...)
04 FXD Stage 1(traded for...)
04 FLHTCUI 95" Stage 3
.

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