The increased gain comes from the constant current supply (CCS) on the 2C22 tube plate. It allows the tube to operate at maximum efficiency by ensuring a constant current regardless of load - CCS is very popular with the tube DIY crowd, and now I know why! The preamp seems to have unlimited supplies of clean power with the CCS, and vocals are downright startling.
Since I substituted the single triode 2C22 for the dual triode 6SN7, I had much less gain than stock, so I don't have the "too much gain" issue anymore.
Since I substituted the single triode 2C22 for the dual triode 6SN7, I had much less gain than stock, so I don't have the "too much gain" issue anymore.