PENTODE
The 8136 Vacuum tube is a miniature type used in the Tektronix Oscilloscopes.
model 545A,
model 503,
model 543B
It requires a miniature seven pin socket.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Preferred Substitutes ................... 6DK6