VALVE SOCKETS
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← Find a valve socketTelefunken LD15 keyed seven-contact interface
Mechanical data, images and references from the EnryLab archive.
Key specifications
- Reference code
- TELEFUNKEN-LD15-7
- Contact positions
- 7
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 | 1.4 | Dimension stated in the textView detail |
| Pin length | 8 | Dimension stated in the textView detail |
In depth
LD15 uses seven contacts in an asymmetric, polarised layout, distinct from the seven contacts of B7G or Septar.
LD15 uses the Dezifassung T1788, already specified in 1944. LD1, LD2 and LD5 use other receivers and are not merged by name analogy. For LD15, operation with or without a socket and the male-pin dimensions must be distinguished.
Describing LD15 as an altitude-capable version of LD5 does not, by itself, prove an identical receiving base. Product references remain specific examples. External terminals, knobs and handling features do not become additional socket contacts.
LD15 pins are 1.4 mm in diameter and 8 mm long. The knob can be unscrewed and serves for handling, separately from the seven electrical connections.
It is a transmitting triode for decimetric wavelengths, developed from LD5 for operation at altitude. A socket affects stray capacitance: the specified wavelength limit changes from 450 mm without a socket to approximately 600 mm with one. This operating difference does not establish mechanical identity with LD5.
Technical drawings
The drawings show orientation and geometry. Links beside the dimensions open the available detail.
Photos and examples
No photos are available for this socket yet.
Related valves in the archive
Total linked designations: 1