Miniature relays

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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
148-0107-03 SPDT TO5 replacement
148-0107-04 DPDT TO5 replacement for 148-0055-00 (7A13: K6,K26)

to be expanded


  1. Repairing 7A13 relays @ PA4TIM (how to take relays apart, inside photos)
  2. 7A11 repair report at
  3. Tek 7A13 broken relays @ IK1ZYW Labs


See Also

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