Description
DO20 by Mullard was an excellent output triode working at 7.5 Volts heater.
It was designed for powerful receivers or amplifiers.
We have the following variation of the Mullard DO20.
Balloon version circa 1927.
Long cone came later in the 1930.
Pair of DO20 Mullard balloon top pip the very first one DO20 made by Mullard and the rarest.
All four valve tested and in working order.
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