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Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1939 Category: Power supply/conditioner or battery or charger 
Valves / Tubes 1: 6X5
Power type and voltage Storage and/or dry batteries / 6 Volt
Power out
from Model: SPU686S - National Company; Cambridge &
Material Metal case
Shape Rack
Notes rack mounted vibrator pack for 6V DC;
output power 165V DC (B+ voltage), 45 mA
used to power HRO / HRO-5 series receivers
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 22, covering 1951

All listed radios etc. from National Company; Cambridge & Malden (MA)
Here you find 430 models, 275 with images and 162 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.