512
The Tektronix Type 512 is a 2MHz oscilloscope. Maximum sensitivity is 5 mv/cm. The vertical signal path, fully differential and DC coupled from the front panel A and B inputs to the vertical deflection plates, is as follows:
- Stage 1: differential, 5879 pentodes
- Stage 2: differential, 12AU6 pentodes
- Stage 3: differential, 12AU6 pentodes
- Stage 4: differential, 12AU6 pentodes
- Stage 5: differential, 6AG7 pentodes
Frequency response extending all the way down to DC was a distinguishing feature at the time the 512 introduced.
The input impedance is 1 megohm in parallel with 45 pF. The 512 uses a total of 3kV of acceleration voltage: -1500V for the cathode, +1500 for the anode. It weighs 54 pounds and uses 280 watts. Up to serial number 2525, the 512 used the 5CPA. After that, the 5ABP was used.