2A3 FIVRE brown base large Square getter HOLY Grail of all 2A3 perfect quartet audio triodes with original box

Description

The 2A3 is a three-electrode, high vacuum  type of power amplifier tube or valve for use in the power-output stage of A.C. operated receivers.

The 2A3 has also been used on HI-END amplifiers with stunning results.

We are proud to show some of the best 2A3 variations.

The exceptionally large power-handling ability of the 2A3 is the results of its design features. Among these are its extremely high mutual conductance and its large effective cathode area.

Filament voltage 2.5 Volts

Filament current 2.5 Amps

Plate Voltage 250 Volts max

Grid Voltage -45

Plate Current 60mA

Mutual Conductance 5.2

FIVRE (Fabbrica Italiana Valvole Radio Elettriche) saw the light in Florence, Italy in the 1930s and since then started to produce their own valves under US patent, then they employed their own modest machinery to make valves branded FIVRE

The FIVRE 2A3 is for sure the most sought-after triode of all time. FIVRE was ahead!

Introducing a matched quartet of FIVRE 2A3 brown base with large getter  considered the BEST 2A3 in the world!

Valves have FIVRE embedded on glass with large decal showing year or manufacturing etc. Large mica  on top of envelope.

Original box.

Like all 2A3’s great audio valves!

Tested with AVO VCM 163:

FIVRE 2A3 51mA 100%

FIVRE 2A3 50mA 100%

FIVRE 2A3 52mA 100%

FIVRE 2A3 51mA 100%