Valve Gallery - Output Valves (3)

Valves: PEN4VA, KT31, PEN45, EBL1.

Shown above is Mullard PEN4VA.  It is an early output valve with distinctive balloon shape.  At 140mm height it has a 4v heater and 3.8w output with B7 base. Shown above is a Marconi Osram KT31.  This less common valve has a 26v heater and a B7 base.  It is a large valve at 158mm and delivered 2.5w output.

Shown above is a Mazda PEN45, using the Mazda Octal base.  It has a height of 110mm with 4v heater, and could deliver 4.5w. Shown above is a Mullard EBL1 with P Type or CT8 base.  With 6.3v heater is delivered 4.3w.  Envelope also contains two diodes.

Continue to the next Output Valves gallery page   

COPYRIGHT RETAINED ON ALL TEXT AND PICTURES ON THIS SITE 2005 AND BEYOND.