83 tube rectifier type FIVRE NOS NIB VALVE FULL WAVE RECTIFIER
MATCHED QUAD FIVRE TUBES = 4 PIECES  
STILL SEALED FROM THE ORIGINAL FACTORY
MADE IN ITALY FULLY ORIGINAL
BEST PRODUCTION EXCELLENT SOUND

BROWN BASE & BLACK PLATE
OLD VINTAGE PRODUCTION VALVES  1930's
ULTRA RARE IN THESE CONDITIONS
NEVER OPENED STILL SEALED

FULL WAVE VACUUM VAPOR RECTIFIER FOR POWER SUPPLY
83 = 183_83 = VT-83 = AG = NU-83 = 301A WE
SOCKET UX-Base 4 Pins (2 thick, USA 1924)
Filament HEATER Vf 5 Volt / If 3 Ampere / Direct

<1550 piv; 1A peak; <225mA mean output at 450V rms input for capacitative input filter.
Load delay of 10 to 15 seconds required. ER83

As a Full wave rectifier it has two plates and a common cathode.

It is meant to be used with a power transformer with a center tap on the secondary.

The 83 is directly heated, which means the filament is identical to the cathode and thus it only needs four pins as shown.

The two plates get connected to the high voltage secondary.

The center tap of the high voltage secondary severs as ground. Rectified voltage output can be taken from either side of the filament or from a center tap on the filament winding. The filament of the 83 needs 5V and a hefty 3A. The 83 was developed for higher current demands. It can deliver up to 250mA. Besides the increased current handling capability the mercury vapor enables a low voltage drop of only 15V which is mostly constant and not impacted by current draw. This is beneficial in applications with varying current draw as for example in Class AB amplifiers. Maximum peak inverse voltage is 1400V. For all technical parameters see the RCA data sheet. The tube comes in a ST16 size glass bottle which is the same envelope as seen on a 2A3.

As far as I am aware the 83 was never made in globe shape glass, only ST shape. Unlike other mercury vapour tubes like the 866A or 816, the 83 can be mounted vertically as well as horizontally. It also does not need a pre heating of the filaments to vaporise the mercury before high voltage gets applied. But of course it will not hurt to treat it gently. One of the most well known uses of 83 rectifiers was in the TV-7 tube tester. This tube tester is also an example in which the tube is operated while mounted in horizontal position and no means of pre heating are applied.

BOX  62