Jan 3, 2009 · Welcome all! This is a build i've had in the works for awhile now. A salvaged power amp from an old Univox 1236 with re-done power supply, and the Transformers from a Univox. BUT, the Preamp is totally different.... I'm using 6AC7's. No, I don't mean 6CA7's, i mean 6AC7 the old school high...