Price in 1947: Unlisted
75 Watts, 60 Cycles . . . Built to Gilbert Hall of Science precision standards.

Price in 1948: Unlisted
75 Watts, 60 Cycles . . . Built to Gilbert Hall of Science precision standards.

Price in 1949: $6.50
75 Watt, 60 cycle, 15 volts, A.C. only. Simplified 3-terminal post arrangement. Runs P-55 Electric Engine; also American Flyer trains. $6.50. Denver and west, $6.85

Price in 1949: $6.50
75 Watts, 60 Cycles . . .
Similar in appearance to above (4B Transformer), but without circuit breaker, $6.50. Denver and west, $6.85.

Price in 1950: $6.50
Developed by Gilbert Hall of Science engineers for operation of American Flyer Trains ond other electrical toys. Engineer's Throttle has easy-to-grip handle; panel shows scale miles-per-hour. Output is 75 Watts. Simplified three-post terminal arrungement. AC only, 60 cycles, 15 volts. Price, $6.50 Denver and West, $6.75

Price in 1950: $6.50
75 Watts, 60 Cycles AC. Same as above except has black finish and is without Circuit Breaker.
Price, $6.50. Denver and West, $6.75.

Price in 1951: Unlisted
Same as above except has lower power output and is without Circuit Breaker. Black finish.

Price in 1952: Unlisted
OUTPUT; 75 WATTS, H0-120 VOLTS. 60 CYCLES, A. C.
(Not Illustrated) Same as No. 4B Transformer except has lower output and no Circuit Breaker.