1950s Bakelite Silvertone Signal Booster #6875 in very good vintage condition. The tubes are in working order and both of them light up when plugged in. The case/shell is made of dark brown Bakelite and does have a piece broken out of the left side in a triangle shape, as shown in the photos. All the knobs turn smoothly. This is a nice piece of broadcast television history and perfect for a tinkerer, as part of a collection, or just out on display!
Back exterior shows 2 tubes and 5 terminals numbered 1 to 5. It has a sticker & fixed metal plate inside that say: Silvertone SIGNAL BOOSTER, RECEPTACLE FOR TV RECEIVER, MODEL 6875, MAXIMUM LOAD 2.8 AMPS., 105-125 VOLTS, 16 WATTS, 50-60 CYCLES., IMPUT, GND., OUTPUT, CHASSIS NUMBER 632-400
*This signal booster is the same as the REGENCY DB-400 made by I.D.E.A. Corp. of Indianapolis, IN in the late 1940’s or early 1950’s. Silvertone was a brand created and promoted by Sears, Roebuck & Co. for its line of consumer electronics and musical instruments from 1916 to 1972.
*From the internet: “The circuit consists of two identical 6J6-based amplifiers, one each for the high and low channel groups. Four coils are tuned by moving powdered-iron cores in and out (permeability tuning) by rotating the single tuning knob. A switch selects the circuit needed and turns the unit on or off. The “ON” position turned on the booster’s tubes’ filaments but passed the antenna signal straight through to the TV set....in effect, a “standby” position. The ubiquitous selenium rectifier made the plate voltage, through a small transformer.”
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