511

The 511 was Tek's first product. There is also a 511A, introduced in 1950. It uses a standard CRT, the 5CP1A. The vertical output of the 511A is a pair of 6AG7 tubes, AC-coupled to the vertical deflection plates. The 511A does not have response down to DC. The frequency range is specified at 10 Hz to 10 MHz. There is also a 511AD.