Well, I guess I'm officially addicted to building amps, LOL. The Martin 112T was built by Dearmond-Rowe back in the late 50s. It's very much in the 5E3 vein, circuit-wise, though it is not identical and the transformers are rather different...and it has tremolo. Anyway, I've been following the market on these for maybe 4 or 5 years and they've been pretty high for quite a while. Several years ago, they were routinely going for over 2K, lately when they've come up for sale--which is pretty rare--they're fetching more like 1300-1700 or so. This is still on the high side for a little amp like this, which you compare it to something like a Silvertone 1482 (which seem to go for like 350 bucks or these days, if they're in great shape). So I decided to build one. I'd been toying around with the idea for a while but figured the transformers would be to hard to duplicate. But after talking with a few people recently, I said the hell with it, I'll give it a shot. I bought some great transformers (well I think so) from Magnetic Components. I considered using Mercury's "tone clone" transformers for this but after consulting them, I thought the amp would sound much better with a PT that produced lower B+ voltages. IME with their Magnatone tone clones, they come out too hot with today's higher AC voltages. So I'm using a PT with a 275-0-275V winding but I'm using it with a GZ34 (rather than a 5E3) and I'm getting voltages that are quite close to the schematic. If you use the MMs I think you'll come out way too high and the amp will sound too "new" and sizzley. Like all of my build projects so far, I learned quite a bit in this process. The coolest trick I picked up this time was a technique for orienting the OT so as to minimize hum. Many thanks to Jerry Glass, Blue Strat, donnyjaguar, slider313, trobbins, Gary Croteau and the other guys who helped answer my questions and gave me pointers along the way! The rest of the parts were very straight forward, other than the varistor in the trem circuit (these are what Magnatone used in their famous vibrato circuits). Anyway, finished up the chassis yesterday and played it with the band just a couple hours later. Since I used the same generic chassis that I built my Grinder (GA-40) on in December, I was able to plop it into the same cab and it worked like a charm. Boy...that was the most fun I've had playing in a while, I must say!! Like the 5E3, there's a lot of natural, rich gain on tap and it cleans up extremely well from the guitar. As you'd guess, the basic tonal personality is tweedish--harmonically balanced and rich cleans that gradually move into roaring overdrive. And the amp just LOVES my single-coil guitars and eats up my pedals as well! The humbuckers guitars I've tried through it seem to fare better than through many smaller tweeds I've played through, much to my surprise and pleasure, but you don't have the clean headroom you get with the SC pickups, of course. One of the things I love about it is that it cleans up quite well from guitar vol and pick attack changes but doesn't dramatically lose volume. I'll be working on a cab for it over the next week or two and will post more shots as progress is made.