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5673

 
See also:
Brimar VHF and UHF Valves Advert - Brimar 5763 Advert
    
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The Brimar 5673 is a mystery. We believe that a batch of 5763s were made with a transposition in the lettering.
This exhibited was tested as a 5763 and measured exactly. The 5763 is a small transmitting beam tetrode valve for HF and low VHF use and is equivalent to the Mullard QV03-12.
The circular anode contains a flat sided cathode and grids that are flat across the cathode width and rounded at the ends. The screen grid wires are directly in front of each control grid wire.
The heater is referenced as 6.0 V by RCA, Brimar and Mullard.
John Fielding ZS5JF has sent the following information and the RCA datasheet.
The 5763 was extensively used as an oscillator, multiplier or power amplifier in HF and VHF equipment. The old Marconi Instruments Q meter variable frequency oscillators used it, also used in the psu as a series regulator valve. The useful upper frequency limit is about 300 MHz. It was also used as a driver or PA in some early Pye Telecomms VHF mobile radios before being superseded by the twin tetrode QQV03-10 type of valves.
Thanks to Gus Cusick for sending this image.
The thin glass tube envelope is  mm in diameter and, excluding the B9A base pins, is  mm tall.
References: datasheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a
-
g3
h
h
g2
k
g1
g1

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
mAg
Pdriv
Pout
Pdiss
freq
f.max
6.0
0.75
300
250
-60
50
5
3
0.4W
8W
12W
30
175
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 01, 2018.
shape:thin.glass.tube construction:all.glass type:beam.tetrode age:1940.1950 base:b9a heater:6.0v pins:9 pin:1.a pin:2.- pin:3.g3 pin:4.h pin:5.h pin:6.g2 pin:7.k pin:8.g1 pin:9.g1
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