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Update - The new reverb transformer arrived from Mesa, 550185. I calculated the impedance ratio at 20K:8 ohms. Got it up and running, sounds great! Talked to my friend, he's anxious to hear it. He said it's the first time he'll have heard the amp with reverb since the late 70's! When I get a...

Just to update - I contacted Mesa, and Mercury Magnetics and both confirmed that reverb transformer 550185 can be used in place of the original 185225. The 185225 that i have is open on the primary side, so i can't get a measurement from it, but I'll measure the 550185 when it comes in. I...

Thanks Markedman. I will definitely contact them. I figured I'd get a post started on this, in case anyone else is looking for this info down the road. Lots of great info on this board! I've also emailed Mercury Magnetics to see what their take is on it. If anyone else, has any insight, or has...

A friend of mine who has a Mark I asked me to take a look at his amp. He said the reverb quit working on it back in the late 70's and he never had it serviced. I ended up finding the primary side of the reverb transformer did not have continuity. It was not passing voltage to the plate of the...