Long and McQuade is the best music store!

  • Thread starter Thread starter ido1957
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ido1957

ido1957

9K Gold Member
I took my Marshall in today to Long and McQuade. I need the repair technician to check my amp and let me know why it hums so much (both channels), even with nothing plugged in.

Right now that tech is up to his neck in work, so mine will have to wait until they get the warranty work done first. They aren't normally taking anything except warranty work due to the overload but they did take mine anyway! I had the tubes done a while back and that may be causing the hum, but who knows?

Just thought I'd post a positive feedback on L& M because they 've always had great sales people, great technicians and excellent managers (Earl) over the 20 or more years I've shopped there. I just wish I could buy more but I have limited funds....

They're opening a new superstore in Southeast Edmonton soon - can't wait to check it out!

Thanks Guys! :cool:

(New Thread with Correct Spelling in Title ;))
 
you notice how there's that pretentious pinhead or two in every long & mcquade?
 
Marshall JCM900 amp hum is fixed :-)

Got my Marshall JCM900 4100 amp back after only a week from Long and McQuade. (They called the day I took it in and said it could take 1-2 months due to excessive repair workload. Bonus!

I've only had a few minutes to test it since I got it home (because my daughter has to study for a test tonight). There's lots of time to test it though which i will do later....

The hum is pretty much gonzo - noticed the silence right away.....
Amazing difference overall, super quiet, seems louder, more OD, nice tone. It was not 60 Cycle hum which I thought it might be initially.

They did a number of mods to fix it. Here's the breakdown - hopefully this will be of benefit to others in the future. I'd recommend you take your amp to a professional like the guy at L&M for these kinds of mods.....

BTW - the mods included the some of the recommendations I had from guys on this BBS on my initial thread about the hum - you guys obviously know your stuff.

Repair Details:
Replaced second preamp tube.
Replaced low voltage supply zener diodes and master volume switching opamp.
Replaced factory installed (in 1990) 56K bias resistor with 47K bias resistor as per 1994 schematic to lower increase the negative bias voltage from -50V to -38V to properly bias the EL34 tube configuration.
Resoldered misc components and organized wire layout to help with noise further.
Rtv’d misc components.
Test ok

Mesa Boogie 12AX7 preamp tube 13.95
YSL Marshal Part Valvestate IC M5201 5.95
YSL Part 1N5245B 15VO OW5 Z (2) .50
YSL Part 1/2W 47K5 T&R RES .25
Repair Labor (60) 65.40
Subtotal 86.05
GST 5.16
Total 91.21 (CDN)

So a big hats off to Long and McQuade. I'm going to test this amp some more this weekend and I'm hoping this repair is all I needed
 
I would like to open a small music store here in a town of about 5000. It's the county seat, and I wonder if it would do any biz? Maybe just carry used stuff I buy on ebay or something. No music stores for 60-100 miles.
 
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