OL-1 3 Inch scope with 3GP1 CRT Very compact (9 ˝ in. X 6 ˝in. X 11 žin.). Printed circuit boards. Charcoal gray. Direct connections to deflection plates for checking AM plate modulation. Vert. amp response: within 1 db from 1 Hz to 100 kHz; within 5db from 5Hz to 500 kHz. Vert. sensitivity: 0.2-v/inch @ 1kHz. Input impedance: 12pf shunting 10-megohms. Sweep generator: 10 Hz to 100,000 Hz with positive lock-in circuit. Cathode follower input on both vert. & horiz. amps. Provision for internal and external sync & 60 Hz line sweep. Shipping wt. 15 lbs. Price in 1955: $29.50