VALVE SOCKETS
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← Find a valve socketEimac special four-contact interface for Johnson 124-214
Mechanical data, images and references from the EnryLab archive.
Key specifications
- Reference code
- EIMAC-SPECIAL4-124214
- Contact positions
- 4
Mechanical dimensions
All linear dimensions are in millimetres and describe the valve base and its pins. They are not socket-hole diameters.
The pin circle passes through the pin centres. Pin spacing is the straight-line distance between adjacent centres. ≈ denotes a value calculated from nominal geometry; ± denotes a tolerance, parentheses show limits and ≤ denotes a maximum.
| Dimension | Value (mm) | Detail |
|---|---|---|
| Valve base | ||
| Pin diameter | 6.35 ± 0.0254 | Dimension shown in the drawingView detail |
| Lateral-pair centre spacing | 42.8752 | Dimension shown in the drawingView detail |
| Axial-pair centre spacing | 31.75 | Dimension shown in the drawingView detail |
| Pin length | 18.5674–19.3802 | Dimension shown in the drawingView detail |
| Base-body diameter | ≤ 107.95 | Dimension shown in the drawingView detail |
In depth
Eimac 1500T and 2000T use Johnson receiver 124-214 with a Special 4-pin interface. The four bottom contacts remain separate from side and top valve connectors.
1500T uses that same receiver product. Male bases 5005B and 5006B nevertheless remain different structural parts: accepting one receiver does not make them identical.
Generic terms such as Jumbo 4 or an electrical diagram number do not define this interface. Differences in size, dissipation and external connections remain specific to each valve even where the lower receiver is shared.
On Eimac 1500T all four bottom terminals serve the filament and must be used, two for each supply end. Diameter is 6.3246–6.3754 mm; horizontal centre spacing is 42.8752 mm and vertical spacing 31.75 mm. Pin length is 18.5674–19.3802 mm.
Cooling also covers the base bottom, with air directed towards the filament passage. Two conflicting central-opening dimensions, 19.05 and 25.4 mm, remain separate rather than becoming one mating dimension. Grid and anode use separate external connections with HR-8 heat-dissipating connectors specified.
1500T requires vertical mounting, base up or down, and flexible grid and anode connections. The support must protect the tube from shock and vibration. A possible shared receiver does not remove these valve-specific conditions.
Technical drawings
The drawings show orientation and geometry. Links beside the dimensions open the available detail.
Photos and examples
Related valves in the archive
Total linked designations: 4