Powerstat Adjust-A-Volt 116U PRI 115V SEC 0-135V Panel w/3 Variacs 9432 Meters

Powerstat Adjust-A-Volt 116U PRI 115V SEC 0-135V Panel w/3 Variacs 9432 Meters

This is a vintage multi-variac control panel built around three Powerstat/Adjust-A-Volt variable autotransformers — two Powerstat Type 116U units and one Adjust-A-Volt Type 9432 — all mounted to a single gray hammertone front panel. The panel also carries three Burlington Instruments Model 538 running time meters and a Telecron Minitmaster panel clock, making it a self-contained, instrument-grade voltage control assembly. It came out of a vintage rackmount test equipment setup.

Specifications & What's Included

• Qty 2: Powerstat Type 116U Variable Autotransformer (Variac)
• Qty 1: Adjust-A-Volt Variac, Type 9432
• Primary voltage: 115V AC
• Secondary voltage range: 0–135V AC
• Frequency: 60 Hz
• 3 individual control knobs (black dome style) on front panel, one per variac
• 3 panel meters mounted above the knobs (one per variac output)
• Qty 3: Burlington Instruments Running Time Meter, Model 538 (100V, 60 Cycles)
• Running time meter readings: 59 hours, 734 hours, and 721 hours (as photographed)
• Telecron Minitmaster panel clock (mounted front panel, center-bottom)
• Panel-mount dome indicator lamp, labeled "I.L."
• Hand-drawn wiring schematic penciled on aluminum sub-plate (labels T302, T301, T308, clock terminals, common, 115V)
• Three toroidal variac cores visible on rear sub-plate with yellow and red wiring harness
• Terminal strip on rear sub-plate
• Small auxiliary transformer on rear sub-plate
• Gray hammertone steel front panel
• Form factor: panel/rackmount

Applications

Variacs (variable autotransformers) are standard lab and industrial tools for adjusting AC voltage smoothly from zero to above line voltage — used in test benches, burn-in racks, component testing setups, and anywhere a precise, continuously variable AC source is needed. Multi-variac panels like this one were commonly built into rackmount test equipment racks in mid-twentieth century labs and engineering facilities, where several independent voltage channels were needed in one panel. The Powerstat 116U is a well-regarded American-made variac from Superior Electric (the original maker of the Powerstat line), rated for 115V primary and 0–135V output. The running time meters give an accurate record of actual operating hours on each channel, which was important for maintenance scheduling in production and test environments. This panel would suit vintage electronics restoration, antique radio test benches, museum-quality lab displays, or any application where a multi-channel variable AC panel with period-correct instrumentation is wanted.