My attempt to buy the RCA hi-fi amp fell through, but I did manage to get this in a trade today.
The previous owner had already modified it to a Fender circuit last year and was in the process of converting it to a different design when we made the trade. The original tube compliment was 6SJ7, 6SC7, 2x 6v6 and a 5y3. It has two 6SJ7 at the moment. I've been reading up on octal preamps and I think I'll leave those alone. So far I have found two schematics that I may use. The Ampeg J12b and the R12 both use these same tubes. I heard the R12 and it sounds great - very tweedy. I haven't heard a J12b yet, but I did read that it is the tamer of two. Anyone have thoughts on either?
I asked the previous owner if he knew what the output was on the PT. He said 295 which I presume is VAC. It looks like that's in line with Ampeg, but low for some of the Fender schematics I've looked at. The cap can will definitely be going. Going hunting for tube amp books at Powell's tomorrow.
The previous owner had already modified it to a Fender circuit last year and was in the process of converting it to a different design when we made the trade. The original tube compliment was 6SJ7, 6SC7, 2x 6v6 and a 5y3. It has two 6SJ7 at the moment. I've been reading up on octal preamps and I think I'll leave those alone. So far I have found two schematics that I may use. The Ampeg J12b and the R12 both use these same tubes. I heard the R12 and it sounds great - very tweedy. I haven't heard a J12b yet, but I did read that it is the tamer of two. Anyone have thoughts on either?
I asked the previous owner if he knew what the output was on the PT. He said 295 which I presume is VAC. It looks like that's in line with Ampeg, but low for some of the Fender schematics I've looked at. The cap can will definitely be going. Going hunting for tube amp books at Powell's tomorrow.