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Seems a bit extreme to risk the equipment to save move and setup time. If moving/setting up is the issue, might I recommend a Stage Rig (or something similar)? I don't work for them, know them and actually, never bought anything from them, (bought mine used from a guy who used it with his...

Ah ha. You have inspired me to look at the schematic, and figure some out for myself.... If I replicate the input gain control used on clean channel (V2 input pot) onto V1 (lead channel pre-amp), post LDR1, relative to input jack, it should be perfect. Master gain control will still affect...

The SOB or plain Boogie/Mark 1 is what Santana used(uses). Which is what the Mark/Caliber line is based on. And a 50 cal is only 50 watts instead of 100. SOB should be louder, but a more correct replica if you can't get a Mark 1. http://www.santana.com/carlos/gear.aspx

The 50 Cal + gets very very close too. Probably identical, if I tried harder to find it. I know it's in there, somewhere. The guy I bought mine off of only bought it to use in his recording studio to replicate the Santana vibe for 1 project, and then sold it (lucky me!). I bet any of the...

I read where people discuss a mod giving the 50 cal+ independent gain and volume controls. Does anyone have a schematic for this mod? I have the schematic for the amp, and already done multiple repairs and am very capable of performing it. But I wanted to know the mod everyone else has been...

I'd have to look it up again, but I know the EQ only works on one channel when the switch is set to auto. In is On, off is off, and auto turns it on while on one channel. And I forget which. I just use a footswitch for it, in and out when I need it. And adjust tone controls to get my tone...

Sounds like it's a power supply problem for the switching circuit. I had similar problem on my .50 cal+. The power supply circuit to the LDR (electronic switchers that the foot switch controls) was bad. In my case, it switched....really...really slowly due to a cap being faulty and a resister...

It sounds like the V2 tube (original one) is questionable. In the Caliber series, the channel switching adds V1 to the front of the pre-amp chain. Since it adds an additional stage of gain, you end up amplifying any noise from from V1 in the following gain stage. My theory on what you are...

I have decided I should take my 2 x EV SRO/12's (I think they might be older than me), and put em in 2, 1x12 cabs, to run 1 each with my .50 Cal and Musicman 112-65RP. I had been considering a 2x12 cab for them, before I got the .50. I was wondering if anyone knows if the AlNiCo SRO/12 would...

That kicks ***. And sounds like it was the right price! Will a EV SRO 12" fit in a standard Thiele cab? I have 2 of them, and wondering about making some cabs for them. Used them in every amp I have had until now, once with 1 in amp and 1 as a single and a ext cab, and then both in a Peavey...

Interesting. I was under the impression from the reading I had done, that they were all self biasing. And as a result, any tubes in the same model line would work, but just be different in performance. Haven't seen an adjustment point in my 50 cal, but it is the only Mesa I have worked on so...

I run my .50 Cal+ and Musicman 112-65RP using my Rocktron stereo chorus pedal. For a non-professional setup, it sounds pretty ballsy. It really fills up the room, even when not in chorus mode. Using the phasor of the MM gives the entire rig a neat phasing effect, even though only one is...

As far as type of tubes, I would leave that question to the experts who have tried more than 1 or 2 sets of tubes. But I did just swap in all new Mesa tubes in mine this week. A tip while installing them: I was given a "ultra low microphonic" tube in my set when I bought them. I swapped...

I am finding the 50 cal's effect loop isn't that usable for my effects. Using my pedal's or Alesis Wedge (circa 1995 reverb unit) produces a high pitch squeal when attempting to turn up input volume on them. While this can be made to work by turning the effects levels down, in bypass mode this...

Oooh, I was too excited I was actually right when reading a tube schematic. Years out of practice (used to be a consumer electronic repair tech, where only tube circuits i saw were CRT variety). I was only 100% right, on 2 of my 3 theories. I was right in that the high pass filter is only an...

After my phone call with Mesa today... The 330ohm resister in the LDR power supply should be checked (mine is charred), along with the 3300uf cap it's in series with (bubbled). Check the supply voltage here. Should be 1.6v with switch engaged (in overdrive), 7.6v without. As well as check...

Just got off the phone with George, at Mesa. I am 100% correct (self pat on the back). The RC tank on the input of these amps is just a high pass filter to set the initial tone of the signal coming in to the amp. And the LDR's do exactly what I deduced. He also answered my questions...

The resister+cap in parallel are a type of high pass filter, cutting out some of the low end of the signal path. This might be for 60hz hum, not sure. When the lead channel is kicked in, it is also part of the V1 input filter. (which looks like it may boost what it cuts in normal mode, my...

Just registered, so forgive the 0 post count up until now... I have a .50 Caliber+ as well. Am also having some weird issues with the dirty channel. It looses its tone when lead channel is used, sound fades in and out when switched (which i believe to be normal due to using LDR's instead of...