Photo Page 2
50 R PA Mark 4
- 1: 50 R PA Front View
- 2: 50 R PA Rear View
- 3: 50 R PA Chassis Top View
- 4: 50 R PA Chassis Interior View
50 PA Plus Mark 4
- 1: 50 PA Plus
- 2.1: 50 PA Plus Front View
- 2.2: 50 PA Plus Rear View
- 2.3: 50 Plus Interior Chassis View
ST 50 PA Mark 3
This Dallas Music Industries (DMI) PA head was one of only a few Sound City heads that used transistors; this model had a solid-state preamp, like the PA 200 R, and employed two printed-circuit boards (PCBs). This appears to be a very clean example of this amp. Photos Home Page
2: Sound City 50 R PA Rear View
Note the DMI ID tag and the two-prong power cord and polarity ("Grounding") switch. Photos Home Page
3: Sound City 50 R PA Chassis Top View
In this shot you can clearly see two things: the total lack of preamp tubes; and the top PCB with transistors on it. Photos Home Page
4: Sound City 50 R PA Chassis Interior View
This shot clearly shows the second (preamp) PCB mounted inside the chassis. Photos Home Page
~50 watts from two EL34s, Mark 4 (IV) passive preamp, six inputs, each with Volume, Treble, and Bass, and a Master Volume. Black basketweave Tolex, black knobs, silver vein, gold trim. Note the removable front panel. Photos Home Page
2.1:
Sound City 50 PA Plus Front View
~50 watts from two EL34s, Mark 4 (IV) passive preamp, six inputs, each
with Volume, Treble, and Bass, and a Master Volume. Black basketweave
Tolex, multi-colored knobs, silver vein, gold trim, removable front panel. Photos
Home Page
2.2:
Sound City 50 PA Plus Rear View
Looks like the output transformer might have gotten a tad hot at some
point. Photos
Home Page
Note the easily accessible bias pots. Cool idea. Photos Home Page
~50 watts from two EL34s, Mark 3 (III) passive preamp, six inputs, each with Volume. Inputs in two sets of three with each set having Treble and Bass. No Master Volume. Black Tolex, colored knobs (with some knob caps missing), silver vein, gold trim, removeable front panel. Photos Home Page
Note Partridge transformer labels and that the power transformer is rotated 90 degrees with respect to the output transformer. Photos Home Page
