DO20 Mullard balloon PIP TOP very rare audio output triode chrome plate oxide filament tested 100% boxed

Description

The Mullard DO20 is one of the rarest and most sought after audio valve.

Introduced in 1929 for radio sets, it is nowadays used in DIY amps with excellent results.

You can get the sweetest 10 watts with such a valve.

The DO20 is a directly heated output valve for powerful receivers and amplifiers.

Filament voltage 7.5

Filament amps 1.30

Anode Volts 425

Anode mA 40

Grid -66

Gm 2.50

This is a special sale for an ultra rare Mullard balloon DO20 pip top chrome ribbed plate, never seen one like this before!

The Mullard PIP TOP DO20 has been tested at 45m 100% emission.