home |
new |
{museum features} BTH | equivalentsarticles
collections The Liverpool Collection |
This BTH B4 came complete with original box as shown below.
The box is 90 mm square and 124 mm long. Inside of the box was the original 1924 data sheet as can be seen below.
The envelope itself is without any markings. The B4 was the first dull emitter valve from BTH (The British Thomson-Huston Company) and was first introduced in 1923. The design purpose was as an AF amplifier to drive small loudspeakers. These would not be the moving coil devices of today but probably a horn device powered by an oversize earpiece and being wound with a high impedance coil that was wired directly into the anode circuit of the valve.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 98 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
6.0
0.25
40
More
This exhibit was last updated on 02 December 2007
The box is 90 mm square and 124 mm long. Inside of the box was the original 1924 data sheet as can be seen below.
The envelope itself is without any markings. The B4 was the first dull emitter valve from BTH (The British Thomson-Huston Company) and was first introduced in 1923. The design purpose was as an AF amplifier to drive small loudspeakers. These would not be the moving coil devices of today but probably a horn device powered by an oversize earpiece and being wound with a high impedance coil that was wired directly into the anode circuit of the valve.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 98 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
6.0
0.25
40
More
This exhibit was last updated on 02 December 2007
The envelope itself is without any markings. The B4 was the first dull emitter valve from BTH (The British Thomson-Huston Company) and was first introduced in 1923. The design purpose was as an AF amplifier to drive small loudspeakers. These would not be the moving coil devices of today but probably a horn device powered by an oversize earpiece and being wound with a high impedance coil that was wired directly into the anode circuit of the valve.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 98 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
6.0
0.25
40
More
This exhibit was last updated on 02 December 2007
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 98 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
6.0
0.25
40
More
This exhibit was last updated on 02 December 2007
Absolute Maximum Operating Conditions
Triode |
Vh |
Ah |
Va |
6.0 |
0.25 |
40 |
More
This exhibit was last updated on 02 December 2007
This exhibit was last updated on 02 December 2007 |