157-0053-00
The 157-0053-00 denotes a matched pair of 12BY7(A) (154-0047-00) pentodes. The matched pair is found in the vertical input stage of many early 500-series scopes.
Matching Conditions
- Heater: Nominal ±2%
- Plate voltage: 150 V ±1%
- Screen voltage: 100 V ±1%
- Cathode current: 19 mA ±1%
Selection Requirements
A: Cathode bias of two tubes of a pair shall be within 50 mV.
B: Grid current shall be less than 3 μA.