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A screen grid resistor will barely lower the voltage. Those readings are typical for a MK IV even at the plates.

It's from The Boogie Files. :D

The last of the MK III's were produced in 1998. All post circa 1990 and up were Green Stripes.

It's an '83 sales brochure from Mesa. Who would fake all that typing?

It increases the amount of reverb by adding resistance.. If you follow the red wire in the center, it goes to a 3.3K metal film resistor and the bottom is wrapped in shrink tubing. Look on the back of the amp and you should see a red R in sharpie.

http://homepage.mac.com/mesaboogie/IIC/images/IIClita.jpg

Oh, it has the reverb mod too.

In the IIC literature it stated that the reverb was a two mode type where you could go from ambiet to slap back. I have never seen a IIC or played one so I think this may be an issue.

The big blue ones are the three on the left and the two on the right. The larger 220uf actually has two more under the board. The noticable signs of damage are yellow goo leaking out of them. Some people say to change them every 10 years, but it's up to you. There are tons of original MK I's...

Again, it's a Tip Ring Sleeve jack that gets switched via a stereo plug. The tip grounds or opens the circuit for the reverb and the sleeve grounds or opens the signal to the EQ. The MK III is the same and uses the same method to engage the R2 relay. What kind of footswitch is it that you are...

Are you looking to do a depth mod? It's totally possible. No NFB is usually too much. There needs to be at least some of the signal to keep a balance or it will be a woofy bottom end beast. Other than that, Depth mods are cake.

The plate voltages are perfect. Like most boogie designs, you need to run a cord through the effects loop to see if it has a bad or bent contact. Optocouplers have nothing to do with the presence functions. They are ceramic caps wired right on the back of the R@ and LD presence pots. When you...

It's a TRS jack. Probably a dirty contact.

It should be off.

Uhh, thats a 15" woodie with the EV and Export Transformer and STR-415 USA made 6L6's . That, my friend is a hens tooth.

Wow, forced haggling over a cheap chinese tube with thin glass. Classy. Put the amp on E-Bay. There are places in this country that do not have Mesa dealers and would be very pleased to have your amp @ $ 2350 plus shipping with warranty and no tax.

Dood. Flick it with your finger and see if it stays on.