Don't forget about that "loss" stage, at the dry/reverb mix point. Consider the mix circuit together with the following triode as a total gain block. You can dial the gain up or down by selecting different resistors in the voltage divider formed by 3M3 resistor in series with 220K. As well as the brightness by leaving out the 10pF cap bypassing the 3M3, or selecting different brightness caps across whichever resistor you may select in this leg. Lots of choices available here. You can leave the 3M3/10pF alone, the 470K from reverb pot too, but increase the 220K to 470K or 1M for more overall gain - actually less loss. You're certainly not stuck with the values Fender selected. Take a look at some early Traynor schematics like YGL3, you'll see variations on this circuit. And back to Fender, they leave out the 220K ground leg in Princeton Reverbs to conserve overall gain so the amp doesn't get wimpy. Plenty of room to tinker here, and find the combination that suits your ear. Have fun!