The defining structural choice in the Jose toolkit is the master-volume LOCATION: pre-tone-stack, immediately after the cathode follower. Three things follow:
1. The tone stack sees a constant signal level regardless of MV setting. Tone controls always sound the same — no dark/scooped behavior at low volumes. 2. The clipping diodes (when engaged) shape the signal BEFORE the tone stack and phase inverter. This means the tone stack sculpts the harmonic content of the diode-clipped signal, rather than (as in PPIMV) clipping the already-EQd signal. 3. Compared to a stock 2203 (post-tone-stack MV) or a PPIMV (post-phase-inverter MV), the Jose MV produces a more preamp-dominant distortion character — which interacts predictably with the NFB-loosening mod to give the canonical Jose feel.
Practical layout hazard (see mv-bleed-hazard for the full discussion): moving the master volume from post-tone-stack to pre-tone-stack opens the entire downstream path (tone stack + phase inverter input) to hum and RF pickup at any MV setting. Period Jose amps are documented as "bleeding like a bitch when that master is at zero" (Friedman, Headfirst Amp Chat #17, Feb 2025). The bleed is a layout problem, not a topology problem — careful grounding, short leads, and shielding around the master pot fix it on modern builds. But it's a real build-time hazard for anyone replicating the Jose MV mod on a real chassis.
Friedman's compressed definition (see jose-defining-front-end): asked across multiple panels what makes a mod actually "Jose," Friedman keeps returning to *"the first gain stage and the voltage divider after it."* The pre-tone-stack master is the second-most-defining feature of the canon, behind the front-end signature itself.
Jose's own framing of the push-pull (passed down via Friedman, Headfirst Amps Panel #11, Dec 2025): when asked about the two positions of the dual-gang push-pull master in Jose's "PTS-master" build, Friedman recalled the explanation Jose gave him directly: *"yeah, the out position is for like people that play really low volume … the in position was for people that were going to play with a lot of volume."* (transcript [147:30])
The effect is essentially a stereo-receiver "loudness button" analogy for guitar amps. The pre-tone-stack master clamps the signal before the tone-stack, so at low MV settings the pre-EQ-clipped tone gets fattened low-end by the downstream tone stack — exactly what a Loudness control on a 1970s stereo receiver did. At high MV settings the clipping is less aggressive and the tone-stack passes more of the un-squashed signal. Important misconception correction: the push-pull does NOT switch diodes in and out. When a diode pair is wired into a Jose amp, it is permanently across the MV wiper and is engaged in BOTH push-pull positions. Friedman corrected this on the panel: *"any amp that has this push-pull master, the clipping diodes are always in. They're always in. Not true. Not true at all"* — pushing back on a long-standing internet claim that the push-pull bypasses the diodes.