Miniature relays: Difference between revisions

Revision as of 02:23, 18 June 2024

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 spares 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), installing modern miniature gold-contact relays on top of the cut-off base or, if energizing the coil mechanically operates the relay, using a signal source to cycle the relay for a period of time.

Data

Tek P/N	Contacts	Coil	Used in	Replacement	Note
108-0599-00	SPST (reed)		7T11: A3K31,A3K32,A3K70,A3K71,A3K80
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 7503: K521, K525 7904(A) Opt. 2: K802, K805, K812, K815	AXICOM V23079-D2003-B301 (Ref. 2) Omron G6N, G6S	Relays of the 148-0034-00 family have contacts with 100mil (2.54 mm) pitch; the housings are 16.0 x 8.3 x 15 mm (width x depths x height).
148-0034-01	DPDT	15 V, 600 Ω	7A12: K7, K12, K15, K18 485: K879, K1242		Same pinout as 148-0034-00 but longer leads bent outwards.
148-0034-02	DPDT	15 V, 600 Ω	7A12: K7 for B020000 up		Same pinout as 148-0034-00 but longer leads bent outwards.
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, K155, K160, K180, K235, K280 7B70, 7B71: K3		Same pinout and coil data as 148-0050-00.
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	SPDT	15 V, 600 Ω	7A13: K10, K30		7A13 manual erroneously calls them 12V DC relays. Print on relay identifies them as polarized, but they are not.
148-0054-00	SPDT+SPST	15 V, 600 Ω	7A13: K7, K27	148-0107-04
148-0055-00	SPDT+SPST	15 V, 600 Ω	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		Internally connected. Labled "Alt throw relay" in 7A12 manual.
148-0076-00	SPST		7L12: K1470		reed contact
148-0080-00	DPDT	5 V, 65 Ω
148-0086-00			11A32: A1K840
148-0087-00	SPDT	90 mW	7L12: K300, K353, K356, K1200
148-0088-00	DPDT	15 V, 1 kΩ	7L12: K281, K354, K355, K357, K1130, K1400, K1450 L1: K108, K118, K128, K138 L2: K308, K318, K328, K338		Same pinout as 148-0034-00. 7L12 manual claims "120 mW", but print on relay (and measurement) says 15 V 1000 Ω which is 225 mW.
148-0107-??	DPDT	18 V, 880 Ω	Hermetic TO-5 replacement for 148-0088-00		Based on Hi-G MAW-169 7815 / Teledyne 412-6841, found in L1. The last two digits of the Tek part number are missing. Coil labeled 18 V DC, 880 Ω
148-0107-03	SPDT		Hermetic TO-5 replacement
148-0107-04	DPDT		Hermetic TO-5 replacement for 148-0054-00 (7A13: K7, K27)
148-0140-00	Actuator		2400 series	n/a
148-0145-00	Actuator	7 V(?), 38 Ω	7A42 (five each in four 119-1517-00 attenuators)	n/a
148-0204-00	Actuator		11A33 attenuators	n/a

to be expanded

Links

Repairing 7A13 relays @ PA4TIM (how to take relays apart, inside photos)
7A11 repair report at amplifier.cd
Tek 7A13 broken relays @ IK1ZYW Labs
"... used a function generator to actuate it for a few hours which restored proper operation."
1989 Electro-Mechanical Catalog (OCR)

Patents that may apply to Miniature relays

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3519966A	Electrical relay	Tony Sprando • Richard L Sollars	1967-01-23	1970-07-07	Miniature relays

Pictures

8-pin miniature relays

148-0034-03 in 7A11
148-0034-xx connections (bottom view)
148-0034-00
148-0034-00
148-0034-xx (open)
148-0034-xx (open)
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
148-0035-00 vs. 148-0050-00
148-0054-00
148-0054-00
148-0055-00
148-0055-00
148-0055-00
148-0055-00
148-0054-00 vs. 148-0055-00
replacement Omron G6 relay soldered onto Tek socket
Two 148-0058-00 in the 7A11 probe

Bistable relay actuators

Bi-stable relay yoke actuating contacts in 11A33 front-end (148-0204-00)
148-0128-00 relay yoke
148-0140-00
Three 148-0140-00 in a frame
148-0140-00s in 119-1445-02 attenuator (2400 series)
148-0140-00s in attenuator
148-0145-00 from 7A42
148-0145-00 from 7A42
148-0145-00 from 7A42, view from bottom

Hermetic commercial relays

148-0107 TO-5 replacement relay
148-0107 TO-5 replacement relay
148-0107 TO-5 replacement relay
148-0107 TO-5 replacement relay
148-0107-04 TO-5 replacement relay
148-0129-01
148-0129-01 in 485 attenuator

Other custom relays in Tek equipment

108-0599-00 reed relays in 7T11
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 91: / Line 91: @@
 ==Links==
-* [[Patent US 3519966A]]
 * [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos)
 * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A11.htm 7A11 repair report at amplifier.cd]
@@ Line 97: / Line 96: @@
 * [https://groups.io/g/TekScopes/message/119028 "... used a function generator to actuate it for a few hours which restored proper operation."]
 * [[Media:Tektronix_Common_Design_Parts_Electro-Mechanical_Catalog_4_jan_1989_ocr.pdf|1989 Electro-Mechanical Catalog]] (OCR)
+{{PatentLinks|Miniature relays}}
 ==Pictures==