1920s Mullard PM14 Tetrode Radio Valve In Its Original Box

This amazing collectible is a 1920s Mullard PM14 Tetrode Radio Valve In Its Original Box; where PM stands for Philips-Mullard. A nice display item for the office or radio shack!

It is nearly 100 years old, has never been used and hasn't been tested. As a piece of radio history made by Mullard Radio Valve Co. Ltd, Nightingale Lane, Balham, London, it is being sold as a collectible for display only. 

This high frequency amplification valve has its original paper label with the warning "THERE IS PRACTICALLY NO GLOW FROM THIS FILAMENT" and information about the filament voltage and current, and maximum anode voltage. 

The nicely designed cardboard box is intact with scuffs and blemishes commensurate with age and storage. The colours have faded but are still legible.

Original Specification:

• Brand: Mullard Radio Valve Co.Ltd etched on the side in white
• Type: Tetrode
  
• Base: 4-Pin B4 with a single slot in each pin (split pin)
• Filament: 
• Voltage 4.0 Volts
• Current ~0.075 amps 
• Anode Voltage 150 Volts
  
• Screen Voltage:  75 Volts

Please click on the following links for more vintage valves and radio ephemera

PS: My apologies for the visible fingers in the valves, I need them so they are not included...  ;-)