Miniature relays: Difference between revisions

Revision as of 15:27, 22 March 2020

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 working ones have become very rare. Some of these relays have symmetrical socket layouts so that they can be installed in both possible 180° rotated positions.

Interestingly, Tek appears 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.

Possible repair strategies include "micro-surgery" (Ref.1) or installing modern miniature gold-contact relays on top of the cut-off base.

Relays of the 148-0034-00 family have contacts with 100mil (2.54mm) pitch; the housings are 16.0 x 8.3 x 15 mm (width x depths x height).

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 7A13: K47,K48,K480,K490 7A14: K50,K62,K330 7B70, 7B71: K6,K44,K48,K138,K780	AXICOM V23079-D2003-B301 (Ref. 2) Omron G6N, G6S
148-0034-01	DPDT	15 V 600 Ω	7A12: K7,K12,K15,K18 [note 1]
148-0034-02	DPDT	15 V 600 Ω	7A12: K7 for B020000 up [note 1]
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 7A14: K51,K52,K53,K54,K155,K160,K180,K235,K280 7B70, 7B71: K3
148-0043-00	DPDT	24 V 1325 Ω
148-0043-01	DPDT	24 V 1325 Ω
148-0044-00	DPDT	12 V 425 Ω
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
148-0059-00	DPDT	9.5 V 115 Ω
148-0063-00	DPDT	15 V 600 Ω	7A12: K5 [note 2]
148-0076-00	SPST (reed)		7L12: K1470
148-0080-00	DPDT	5 V at 65 Ω
148-0087-00	SPDT	90 mW	7L12: K300,K353,K356,K1200
148-0088-00	DPDT	15 V 1000 Ω	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)
108-0599-00	SPST (reed)		7T11: A3K31,A3K32,A3K70,A3K71,A3K80

to be expanded

Notes

[note 1] 148-0034-01 and -02 look like 148-0034-00 but with longer leads that are bent outwards. Coil data and pinning is identical.

[note 2] Internally connected. Labled "Alt throw relay" in 7A12 manual.

References

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

Pictures

148-0034-03 in 7A11
148-0034-xx connections (bottom view)
148-0034-00
148-0034-00
148-0034-02
148-0034-02
148-0034-03 bottom view
148-0035-00 in 7A13
148-0035-00
148-0035-00
148-0035-00
148-0035-00
148-0035-00 connections
148-0050-00
148-0050-00
148-0050-00
148-0050-00
148-0055-00
148-0055-00
148-0055-00
148-0055-00
148-0107-04 TO-5 replacement relay
replacement Omron G6 relay soldered onto Tek socket
Two 148-0058-00 in the 7A11 probe

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)
Mag Latch Relay (from 1987 catalog)

7A29 input protection relay

@@ Line 26: / Line 26: @@
 |-
 | [[148-0043-00]] || DPDT || 24 V 1325 Ω|| ||
+|-
+| 148-0043-01 || DPDT || 24 V 1325 Ω|| ||
+|-
+| 148-0044-00 || DPDT || 12 V 425 Ω|| ||
 |-
 | 148-0050-00 || SPST ||  12 V        || [[7A13]]: K10,K30 ||
@@ Line 34: / Line 38: @@
 |-
 | 148-0058-00 ||  ||  4 V 130 Ω    || [[7A11|7A11 Probe]]: K55,K59  ||
+|-
+| 148-0059-00 || DPDT  ||  9.5 V 115 Ω    ||   ||
 |-
 | 148-0063-00 || DPDT  ||  15 V 600 Ω     || [[7A12]]: K5 ''[note 2]'' ||