The 4687A is a voltage stabiliser tube. The 4687 is on a Ct8 base and this variant has the B4 base. Both have identical electrical characteristics.The striking voltage is 130 Volts and the regulation is 6 volts across the full current range. The working gas is neon.The wide glass tube envelope is 25 mm in diameter and, excluding the B4 base pins, is 86 mm tall.References: Datasheet & 1040. Type 4687A was first introduced in 1937. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | k | - | - |
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Absolute Maximum Operating Conditions¶
Stabiliser | Va | mAa | 
| 100 | 10.0-40.0 |
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Updated February 23, 2013. shape:wide.glass.tube construction:pinch type:voltage.stabiliser age:1930.1940 base:b4 pins:4 pin:1.a pin:2.k pin:3.- pin:4.-
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