PP3/250 Mazda thick top mica black ribbed plate matched pair valves AC044 PX4 equivalent

Description

The Mazda PP3/250 was the answer to the Marconi Osram PX4.

Though both valves are equivalent, the Mazda PP3/250 were made in limited quantity with care and patented design.

The filament of a Mazda PP3/250 is made of a single wire and oxide , it lays inside the Anode and it is made of wire going up and down thus creating inverted V shape.

The Mazda PP3/250 is therefore a directly heated power triode primarily for use in the output stage of radio and also used in Push-Pull amplifier.

Filament voltage 4

Filament current 1 Amp

Maximum Anode Voltage 300

Mutual Conductance 6.5

Grid Biad -37

Anode Current 48mA

Pair Mazda PP3/250 with black, carbon plate and thick top mica, something to die for!

Both PP3/250 tested at

44mA 100% emission

43mA 100% emission