Valve Gallery - Screened Tetrodes And Pentodes (2)

Valves: VMS4, MS-PEN, VMP4G, SP61.

Shown above is a Marconi Osram VMS4 var u valve.  This is one of very few "Catkin" valves manufactured by the company.  More can be found at the CATs page here.  4v heater at height of 135mm with B5 base. Shown above is a Cossor MS-PEN.  This valve has a B7 base, and in this case Cossor have thoughtfully printed the heater voltage and current on the metalising of the envelope.  135mm height.

Shown above is a Marconi Osram VMP4G, which dates from about 1930.  Threaded contact at the top would have been tightened down onto fly wire connection.  B7 base with 4v heater var u of height 145mm. Shown above is a Mazda SP61 valve with Mazda Octal base.  This valve is of 103mm height and 6.3v heater.

Continue to the next Screened Tetrodes and Pentodes gallery page   

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