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, 7A14, 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 relays in TO-5 metal can cases soldered to small carrier boards with pins matching the Tek sockets.
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 gold-contact relays on top of the cut-off base.
|Tek P/N||Contacts||Coil||Used in||Replacement|
|148-0034-00||DPDT||15 V 600 Ω|| 7A11: K401,K403,K405,K407,K411,K413,K415,K417,K431
7B70, 7B71: K6,K44,K48,K138,K780
| AXICOM V23079-D2003-B301 (Ref. 2)|
Omron G6N, G6S
|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||SPDT||15 V 600 Ω|| 7A13: K60,K61
7B70, 7B71: K3
|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||7A11 Probe: K55,K59|
|148-0076-00||SPST (reed)||7L12: K1470|
|148-0087-00||SPDT||90 mW||7L12: K300,K353,K356,K1200|
|148-0088-00||DPDT||120 mW||7L12: K281,K354,K355,K357,K1130,K1400,K1450|
|148-0107-04||DPDT||TO5 replacement for 148-0055-00 (7A13: K6,K26)|
|108-0599-00||SPST (reed)||7T11: A3K31,A3K32,A3K70,A3K71,A3K80|
to be expanded
- Repairing 7A13 relays @ PA4TIM (how to take relays apart, inside photos)
- 7A11 repair report at amplifier.cd
- Tek 7A13 broken relays @ IK1ZYW Labs
Other custom relays in Tek equipment
108-0599-00 reed relays in 7T11
Bi-stable relay yoke actuating contacts in 11A33 front-end (148-0204-00)
148-0128-00 relay yoke
11PST reed relay on 262 program cards
11PST reed relay on 262 program cards (top right)
- 7A29 input protection relay