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Mr.Grumpy

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About Mr.Grumpy

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  • Birthday 01/01/1962

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  • Location
    Dallas, Texas USA

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  • Interests
    guitar, elecrtronics, bicycling

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  1. I emailed Mesa, and unfortunately they are not able to replace the board (they're not made anymore), but they think it might be possible to repair the board. They told me to call & discuss... I have this weird thing where I don't really like to make phone calls, but I got through, and guy at the Mesa factory was very helpful. One of their authorized repair centers was very highly recommended by Mesa's tech, so I'll probably take it to that guy after calling or emailing him and getting the details. I'd like to avoid the whole disassembly, packing and shipping business if I can.
  2. Call me maybe? Why? America was on a path to 'metrication' - conversion of our units from Imperial to the metric system, in the 1970s. We learned about the metric system in school, over and over. It really is easier and much more sensible than the random weirdness of the Imperial measurement system, with its weird units and a counting system. One unit - the ounce - is used both as a unit of fluid volume and as a unit of weight (1/16 of a pound!). The reason America still uses Imperial measurements is because of President Ronald Reagan. It's because Republicans are anti-intellectual and anti-science. Still, I believe most American cars are now made with metric fasteners, but I wouldn't be surprised if smaller industries (like effects pedals) are still using imperial tooling and fasteners. http://themetricmaven.com/?p=5820
  3. They're probably English ('Imperial') sized, fractional inch. Probably hard to find those in the Phillipines. *edit* I just checked with my calculator, 7/64" (a common smaller size of hex/allen screws) and it works out to 2.77 mm.
  4. I just stumbled across this during a web search, a very interesting article (to me, LOL) about this amp. http://www.math.uwaterloo.ca/~rblander/music/studio22.html
  5. I can't figure out how to put the pics where I want them, or insert text between the photos. But here they are. The close up picture of the component side shows the charred part of the circuit board by the diode and R131 resistor pads. The picture of the solder side of the circuit board shows some browning around the power tube sockets, but I think the real problem is where the large cap and power resistor are. Interesting that the cap is a large value but rated for low voltage, only 16 volts. I think that's the power supply for the LDRs that do the normal gain/boosted gain switching inside the amp. The power resistor mounted under the circuit board may be a repair or re-work, I'm not sure.
  6. I opened it up and took a good look inside. It's not as 'toasted' as I thought it was, and although there's "browning" around the tube sockets the worst of the burning is right under a power resistor. It looks like a 2-watt carbon comp type resistor, mounted on the underside of the board. From reading on some amp forum somewhere, it appears this is common and well known occurrence with these amps. I'm sure this is a grid supply that has to be at a particular voltage. My music man amp has something similar - half wave rectifier, a filter cap, and dropping resistor and zener diode. Anytime the amp is on, that resistor probably gets close (or above) 200 degrees F. pictures later...
  7. Yes, Mesa's "estimated repair chart" shows typical repairs for a Studio .22 to be "$150 - $200" and if that would restore my amp to working condition that price would be a bargain. But if you scroll down on Mesa's repair page, it has a separate entry for "Badly burnt PC board damage" says "need photos for est." Heck, it would be worth another $400 if Mesa could install a new, fresh board. I know electronic stuff doesn't last forever, but we've been spoiled by tweed and silverface Fenders that - of course with maintenance - keep going for 50, 60, 70 years.
  8. I've gotten a good few years from this used amplifier. I've owned it about 9 or 10 years, I think I paid $400 for it back then. It works fine for a few minutes, then after it warms up for a while, it starts hissing and then later, gets this crackling and rumbling noise through the speaker that eventually overwhelms the guitar. NO, it's not an intermittent effects loop normalling jack; I already have a patch cable on the effects loop. I pulled the chassis out years ago to take a look, and the PC board looks like burnt toast. Good ol' board mounted tube sockets. Sure, they're fine until the warranty runs out, and maybe even a few years beyond that. I was reading some amp & electronics forums and although it sounds like a temporary fix MAY be possible, it's due to an ongoing deterioration issue that can't be stopped while using the amp. One forum's advice was to find the burned, carbonized spot on the PC board and scrape it off, as it acts like an extra resistor between random circuit traces. The only real long term fix would be to transfer all the existing components to a shiny new circuit board, probably not cost effective for Mesa to do, and probably not for me either. Years ago I saw a foreign, maybe Russian website that was selling "clone" PCBs for many popular tubes amps including Marshall, Fenders and Mesas. Can't find anything now, Mesa seems to do a pretty good job keeping their IP (schematics 'n' such) off the internet. I may slide the chassis out, take a few pics, and ask for a quote from Mesa, just for laughs. But most likely it's bound for the trash heap, the dustbin, garbage dump, landfill....I don't really see any 'rehab' possible that doesn't cost as much or more as just buying another tube amp. I've already got a used SS Marshall from GeeSee picked out, now I have to explain this to the wife.
  9. This popped up in my FB feed, haven't watched the video yet, but this seems relevant to this forum. https://www.sweetwater.com/insync/guinness-world-records-pedalboard/
  10. Your guitar will be fine, water or saliva won't do much. A solvent like nail polish remover could conceivably melt the lacquer insulation on the pickup wire and short it out. Spilling beer, soda large amount of any fluid into/around a guitar amplifier is very bad and should be avoided.
  11. "Things" by Louis Cole [video=youtube;RhllQAiEQlM]
  12. In addition to being an awesome drummer and keyboard player, Louis straps on a bass guitar and slaps it into the next week... [video=youtube;cd0KOtgc88M]
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