I also forgot to mention that these amps are very brite! Alot of the Sf to Bf type of component changes can also help this amp alot. Change a few caps and a couple resistors and its right on tone! Even if ya dont want to go to such extent just simply cut the brite cap off the circuit board for an immediate reduction of that over the top shrill with some single coil pickups.

One of the nicer quality production circuit board amps.
I like the way they packaged it up to true vintage spec. with quality chassis and cabinet made of real birch (?) ply and not pressed board mdf junk. The polarity reverse switch cracks me up? I suppose you could use that spot to wire in a midrange pot to the bandstack or a mv or something.
The iron in these are kinda weak but they do have a little extra voltage on pwr xfrm. I like it with a different rectifier tube to bring the b+ down and also a little sag.
I tried 6L6’s and the added current draw knocked down the voltage quite a bit even with a GZ34 recto the voltage dropped about 30V on the plate. Even with the drop the amp still had a greater amount of power but better sag and compression from the big swings of voltage drop when hitting it hard. Sounded great but running too hot with heat being generated from both trannys. The amp needed reliability over tone in this instance and changed back to JJ 6v6 and a 12ax7 in the PI .
I definately want to build a 764 deluxe type circuit of my own, with a tag board, premium components, NOS 6L6 and some decent heavy iron onboard like some mercury magnetics. Now, where are those old beater messed up silverfaced twins or basketcased reissues for cheap? Need that craigslist special to gut!

Best clean sound ever — I have two of them, couldn’t resist getting a second.