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Thanks, always welcome. So, from what you say, in a mid 1980's Caliber .22, the 50W VS-12 was an unmarked Eminence, rebranded with Black Shadow. Was it a relabelled stock Eminence or re-spec'd custom made for MESA? I see that my late 1990's MC-90 is labelled Black Shadow by Celestion...

You're welcome. Speakers are not my area but...my Studio .22 is open-back, loaded with a MESA 12" VS-12 Black Shadow 50w - which i understand to be a custom Celestion GT-12. (anyone like to correct me?) This would make sense as Boogies are often used & sound great with Marshall 4x12 (i think...

Hi - nice work. Try searching this forum for combinations of "Studio Lead Master Mod" & "Studio Lead Drive (or Gain) Mod" Find .22 and .22+ schematics online. The .22+ has the Lead Master as standard. You can copy this change and add to .22. From my previous post: Looking at the schematics for...

Pots: yeah - open it up and spray into the back of the pots. i removed the aluminium chassis from the amp and sprayed a little Faderlube into the holes on the pot body near the contacts. Wait 10 minutes. Spray again. Now turn pot spindle gently round. If gritty spray some more. Also allowed for...

I can't be sure, but this is what worked for me. My Rhythm mode was hissy & the Lead mode was like a white noise generator. The amp's tone just didn't have what i remember it had when new even after a service & using good fresh valves checked in another amp. Pots: mine were smooth & didn't...

Could still be a 12ax7 problem but this sounds like you may also need to upgrade R121 as mentioned. If not done it will blow eventually. My old R121 exploded and burnt the circuit board. MESA recommend upgrade. If Foot Switch lost - Mesa manual says any cable can be used and short to chassis...

hiya Tacoiardul If the problem is on the 'Rhythm' mode then it can't be V1 - as V1's enormous gain is only switched in for Lead mode. So likely to be V2 or V3 but could be any other. View your valves when powered up. All look the same colours? Maybe a clue. Any microphonic? Best to get a...

Thanks for the correction (always welcome) and the time taken to explain. This is interesting to me. I used to build amps when a teen but let it slip. 25 years later, planning some amp mods has got me interested in how amps work. To do is to know - but maybe I should read a few good books or...

nuno - I'm fairly new here too - have you searched for posts on your other amps? Maybe post your info there? Like a 'library of mods & schematics' organised by amp? That would be good. As a start we could gather all the .22 mods & post them on a main thread, such as this one. mxr - as for the...

:idea: mxr - we are thinking along the same lines :wink: . I'll do what I can...ANYONE - PLEASE HELP if you can. We should search the Forum for info on all the mods then post them again. Should we make a special forum with all the mods set out clearly? What's the consensus? The mods are...

I agree Nuno - the Studio .22 is beautifully simple & was Mesa's first 'hit single' - as their marketing said in the 80's. The versatility and power of the later Mark series was sacrificed for lower cost - but the build quality & core tones remained high quality. Mods... • Lead Master to...

Here's the Lead Drive mod I mentioned... http://acapella.harmony-central.com/showthread.php?t=2223437

Lead Drive, Pull Deep. That's a good addition - especially if anyone doesn't have the Graphic EQ (which can be set to switch in on the Lead channel only or always in). In any case I would imagine Pull Deep would add more versatility. Similar pull switches could be used on the tone stack pots...

If you decide to do the mods yourself I found the info on this forum with pics and links to other sites with method. Three wires, a resistor, pot & knob for the Lead Drive mod & similar for the Lead Master mod. Main difficulty is removing the pcb & for the novices, doing it :!: safely :!: -...

Hiya I've considered this myself as a worthwhile mod - I've seen service shops offering it online for old AC30's etc. Full a la carte tune-up service. I don't know of a kit but would be interested for any opinion as to why an amp needs a re-cap? What happens to the sound when the caps 'wear...

Hi I would suggest a search of this Forum or google for the Caliber .22 master volume mod. As far as I know the mod is the same for Caliber .22 as .50 Good hunting

A pleasure Dennis. I've also read that over time some of the capacitors can wear out too, which I may look into. Maybe more important on an amp that has toured for years. For any old amp (even un-used & in storage for years) I would suggest cleaning the pots with Faderlube and all the contacts...

Yes - this looks like a USA version (220v or 110v? ground lift maybe a clue) early Studio Caliber, probably a .22 (as said: 2x EL84s=.22 but there were .38, .44 and .50 versions with EL84s or 6V6s). They started in 1985 I think. There may be a serial number or date on the chassis. Your...

Thanks bartchamdoh for the info. I bought my .22 in summer 1988 for £650 just a few months before the .22+ was released - now I'm trying to turn it into a '+' with the Master Lead and Lead Gain mods. If only I'd waited... :( The .22 was R. Smith's first 'hit single' according to the blurb I...