Have a Deoxit party!. Spray that crap everywhere you can. I thought I had major issues with an Eden 400 amp, but Deoxit 5 was the cure. It couldn't hurt.
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Double Bass GK 200mb repair
- Thread starter Earl
- Start date
Have a Deoxit party!. Spray that crap everywhere you can. I thought I had major issues with an Eden 400 amp, but Deoxit 5 was the cure. It couldn't hurt.
It can hurt if you turn the amp on to early. Just cost me a thousand dollar repair of my stereo. Maybe its just me being dumb. How long you should wait, I've heard anything from 15 min. to a day. I THINK 15-30 minutes should be okay..
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I’ve always cleaned them by spraying a small amount of Deoxit 5 onto a 6” Cotton Swab and using the swab to clean each of the jacks. For pots, I spray a small amount of DeOxit into the the pot followed buy air spray to dry it out.
It helped that the shop called it an "upgrade" of my 2k Audionote valve preamp, but I will not be doing that mistake again...
Mine is still giving me grief. I've Deoxed, but still getting this. I think it is in the input jack.
https://photos.app.goo.gl/9h3w1obn7m7twnMR9
https://photos.app.goo.gl/9h3w1obn7m7twnMR9
Repaired once to fix whatever was wrong with the electronics, then there seemed to be something wrong with the speaker, repaired again and I got it back and it was buzzing which made me thing well maybe it wasn't the speaker but the enclosure which had been buzzing in the first place. I can tell the repair dept and L&M is trying but it ain't fixed and I've spent well over what it's worth. Had they told me in the first place I would have sold it for parts. Waiting to hear back from them one last time, if they can't make that buzz go away I'll take it and try myself. Super annoying. When it first busted the amp didn't owe me anything but I think it does now!
The enclosure for the 200MB is an infinite baffle. The replacement speaker works like the ones in car stereos, where they are mounted and sealed into lower door panel. It takes a lot of patience and luck to replace that 12” driver and get a air tight seal. If L&M were supposed to fix it they should be responsible enough to do the work. Just my take.
I was able to pull it off myself with weather stripping from the hardware store, FWIW. Mine just got back from the repairman. Took a couple of trips to pin it down, but he found some cold solder joints and its back in action!
Got a call from the repair dept. at L&M, they have tried and tried and their "cabinet" specialist has had a look and though it is better than it was, still there is some buzz. (Hey I'm a poet and I wasn't even aware of it!)
I wonder how much they actually know about this amp and whether they bothered to look here for some tips, like re-sealing the enclosure with foam tape... Anyway i'll have it back in a few days. Either i'll make it a side project though I have no time for such shenanigans (what with my poetry going so well...), or I'll put it up here for cheap sale for someone else to make it a project.
I wonder how much they actually know about this amp and whether they bothered to look here for some tips, like re-sealing the enclosure with foam tape... Anyway i'll have it back in a few days. Either i'll make it a side project though I have no time for such shenanigans (what with my poetry going so well...), or I'll put it up here for cheap sale for someone else to make it a project.
My guess is the technician didn't have any experience with the GK 200MB enclosure, or how to go about taking it apart and resealing it, but I could be completely wrong. It's a pretty unique amp, for starters, the power supply is mounted to the bottom of the speaker enclosure. Added to that, it's an infinite baffle so
you don't want any air leaks caused by a bad seal. You have to use a replacement speaker from Gallien Krueger, because a regular 12" driver won't work properly in that sealed box. That's a lot of variabiles in an amplifier that's now around 20 years old?
I just left a message at Yorkville sound (they make Traynor amps and do some of the harder repairs for Long/McQuade), and gave my contact there the info you just sent. Maybe the speaker they put in there was the wrong type and that's what's causing the buzz. That would be nice if that's the case. She's probably gone for the weekend so the amp will probably be shipped back downtown and we'll be on this endless loop again... but let's see. Thanks RV for your knowledge and advice.
You have to order the replacement directly from Gallien Krueger on their website. The replacement driver is a Paragon. Specifically for the MB series combos.
