Miniature relays
In the 1970s, Tek produced their own miniature relays in-house that were used in some 7000-series plug-ins such as the 7A11, 7A12, 7A13, and other equipment. These relays have a tendency to fail and have become very rare.
Interestingly, Tek appear to have manufactured replacements based on commercial TO-5 relays on small carrier boards
Some of these relays have symmetrical socket layouts so that they can be installed in both possible 180° rotated positions.
Possible repair strategies include "micro-surgery" (Ref.1) or installing modern miniature relays on top of the cut-off base.
| Tek P/N | Contacts | Coil | Used in | Replacement |
|---|---|---|---|---|
| 148-0034-00 | DPDT | 15 V 600 Ω | 7A13: K47,K48,K480,K490 | Omron G6N, G6S |
| 148-0034-00 | DPDT | 15 V 600 Ω | 7A11: K401,K403,K405,K407,K411,K413,K415,K417,K431 | AXICOM V23079-D2003-B301 (Ref. 2) |
| 148-0034-03 | DPDT | 15 V 600 Ω | 7A11 B100000+: K401,K403,K405,K407,K411,K413,K415,K417,K431 | AXICOM V23079-D2003-B301 (Ref. 2) |
| 148-0035-00 | 15 V 600 Ω | 7A13: K60,K61 | ||
| 148-0050-00 | SPST | 12 V | 7A13: K10,K30 | |
| 148-0054-00 | SPDT+SPST | 15 V | 7A13: K7,K27 | |
| 148-0055-00 | SPDT+SPST | 15 V | 7A13: K6,K26 | |
| 148-0058-00 | 4 V 130 Ω | 7A13 Probe: K55,K59 | ||
| 148-0076-00 | 7L12: K1470 | |||
| 148-0087-00 | SPDT | 7L12: K300,K353,K356,K1200 | ||
| 148-0088-00 | DPDT | 7L12: K281,K354,K355,K357,K1130,K1400,K1450 | ||
| 148-0107-04 | TO5 replacement for 148-0055-00 (7A13: K6,K26) |
to be expanded
References
- Repairing 7A13 relays @ PA4TIM (how to take relays apart, inside photos)
- 7A11 repair report at amplifier.cd
- Tek 7A13 broken relays @ IK1ZYW Labs
