That amp is an offshoot of the old Sho-Bud single channel amp. It was made in Cincinnati for Gretsch, who had purchased the Sho-Bud brand, as I understand it. It's a very good sounding amp using jfet transistors like the Evans and Webb amps. Only has 60 watts of output power, but it's a loud 60 watts. They came with an Altec speaker. The cabinet is well made, but it's very heavy. The power/weight ratio is pretty low, but it is a real sweet tone machine, for a transistor amp.

I've heard that they only made a few of those amps, maybe a few dozen or so, but I can't remember.

Sometimes they get hissy, but you can replace the two jfets in the preamp to quiet them down. Woody Woodell in TN has replacements.