Description
The PP5/400 is a directly heated power triode made by Mazda Ediswan.
It was first introduced in 1931.
The PP5/400 is for use in the output stage where a 450 Volt supply is available.
The PP5/400 has an output of 25 Watts and was able to deliver music or speech in a large hall.
The plate structure is a Mazda patented design.
Mazda PP5/400 Characteristics
Filament Voltage 4 Volts
Filament Current 2 Amps
Anode Voltage 400 Volts
Anode Current 62mA
Negative Grid – 32
Mutual Conductance 7
The Mazda PP5/400 is equivalent of Marconi Osram PX25 and Mullard DO24
We attempt to cover the three version of the Mazda PP5/400 as follow:
1) Thin top mica with getter at bottom
2) Thin top mica with getter on top
3) Thick top mica with getter at bottom
Pair of Mazda PP5/400 with thin top mica and getters located at bottom of envelope.
Top is clean and both valves look superb!
Tested with AVO VCM 163:
Mazda PP5/400 tested 55mA 100%
Mazda PP5/400 tested 54mA 100%
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