PP3/250 Mazda Chrome plate ultra rare pair thin top mica PX4 AC044 equivalent matched pair audio triodes

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

Early version of Mazda PP3/250 with chrome plate and thin top mica, something to die for!

Both PP3/250 tested at

41mA 100% emission

42mA 100% emission