MODEL 2522: the "VICTOR" DUAL-CHANNEL BUILD

Lower Chassis. Note printed circuit board on the left end of the chassis. It appears that each time Mr. Gentul upgraded a single-channel amplifier to a dual-channel design, he added a printed circuit board to allow the additional pre-amp tubes to be mounted within the width of the single-channel chassis. Despite popular bias against PCB circuits versus point-to-point wiring, I have noticed no difference between the two designs in terms of sound quality or reliability.
Tube Array as found
(right to left)
V1: Amperex (Globe Logo) 12AX7/ECC83 (dual triode preamp tube)
(original tube; both triodes tested well above "good" specs)
V2: RCA 7199 (triode/pentode reverb recovery tube)
(original tube; triode and pentode tested exactly at "good " specs)
V3: Unbranded, original 12AU7A (dual triode preamp tube)
(original tube; both triodes tested well above "good" specs)
V4: Unbranded, original Sylvania 12AU7A (dual triode phase preamp tube)
(original tube; both triodes tested well above "good" specs)
V5: Amperex (Globe Logo) 12AX7/ECC83 (phase inverter preamp tube)
(original tube; both triodes tested well above "good" specs)
[Pre-amp tubes mounted to PCB, facing front of amp; power tubes and rectifier mounted to side of chassis, facing downward]
V6: Sylvania 7591A (beam-power-pentode power tube)
(original tube; tested well above "good" specs)
V7: Sylvania 7591A (beam-power-pentode power tube)
(original tube; tested well above "good" specs)
V8: Amperex Bugle Boy 5AR4/GZ34 rectifier (original tube; tested "good")
All tests performed on calibrated Hickok Model 535A tube tester.