Medium-Mu Twin Triode
This is an RCA Black Plate 5687 tube. It is used and
tests like new.
The RCA 5687 Vacuum Tube is a Glass type developed
in 1948. It has a 6 pin base.
Electrical Data ( TS DS - 22 Jan 48)
Heater Voltage ............................ 6.3/12.6 V
Heater Current ............................ 0.9/0.45 A