This is a single diode similar to half of 6AL5. The board requires 6V DC heater volts of 150mA.
Vintage 1950s ROBERTS RMB 46844 Tube & Valve Mains & Battery Radio
2 x Static Detector with display XB1 tube valve Ham radio DIY solder kit
Tube valve Static / Lightning Detector Ham Solder DIY KIT
Electrometer tube valve break out board solder DIY kit Science project
Mullard CRT Equivalent List Guide Cathode Ray Tube Valve - EO83
Vintage Mullard C3JA Tube Valve Component Boxed
