P650 Mazda Chrome Nickel plate balloon audio triodes – A45 Cosmos Metro-Vick Supplies bright emitter receiving triodes

Description

This section shows two type of valves,

On the left a pair of A45 general purpose Cosmos Metro-Vick Supplies valves first introduced in 1925 with two versions:  metal and bakelite base, we offer the latter. The A45 is a bright emitter at 4.5 Volts filament . Both valves are New Old Stock and come with original boxes.

The three balloon valves on the right are Mazda’s P650.

Mazda P650’s longevity was too short, just 4 years of existence from 1929 to 1933.

However it remains an interesting, special valve the way it was made! first of all it was expensive to produce having anode of bright nickel, robust rods and fins; other than that the valve shares similarity with  PX4 and AC044.