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WESTERN ELECTRIC
Trimline Telephone Types

Rotary and Touch Tone

220-, 1220-, 2220-, AC- and AD-types - and variations



U N D E R    C O N S T R U C T I O N
Please send comments, additions and corrections.


Trimline_ Desk Base    Trimline - Wall Base, Rotary     Trimline -
                10-button dial    Trimline -
                12-button dial  


ON THIS PAGE:     Handsets     Bases   Specialty Sets
Handsets:   220    1220   2220     Bases:  AC-    AD-
Specialty Sets with Trimline Handsets:   
Hospital Interphone     50A   Transaction Telephone     Elevator     Design Line 

RELATED PAGES ON THIS SITE:    Colors     Handsets    Table Key    Development Timeline   Touch_Tone_Development 
  WE 500-Series   WE 1500-Series   WE 2500-Series      WE Design Line




Trimline sets were announced in April 1964 and evolved into the models shown here over the years.  They were made by Western Electric until divestiture in 1984, then by AT&T.
Numerous similar designs by competitors demonstrate the popularity of the award-winning design.

To see where the Trimline came from, visit the
Development Timeline

The main innovation was placing the dial in the handset -- a new, smaller #10 rotary dial with moving fingerstop.
Users could hit the recall button under the dial to start a new call. No need to "hang up."

Handsets, bases and cords were separately packaged and merged by the installer -- reducing inventory.
The handset contained the receiver, transmitter, dial and network.
A base contained the signaling device (bell) and switchhook.

Cords were plug-ended. Early production used "maxi" plugs. Later sets used modular ("mini") plugs.
Adapters permitted the use of handset cords with mini plugs in sets with larger jacks.

227D
                    adapter for Trimline handset jacks   231
                    Adapters for Trimline Base Jacks

This page is intended to be a quick summary of the Trimline models produced and major functions.
Western catalogs and technical documentation only show the models that were in production or service at the publication date.  To understand the full scope of models produced we must compile data from many years of documents.

Each model had suffix letters that defined variations.
Details can be found in the Bell System technical documentation (e.g. BSPs - Bell System Practices).


W
Without Bell System markings
G
Polarity Guard
M
Modular set
CS 
Customer-owned (including internal components)
 
More details on set coding are found on the 500-series page.  Many also apply to Trimline sets.


Most info in the chart is from manufacturer catalogs and ads
plus discussions on the TCI and ATCA listservs and Facebook sites, and on the Classic Rotary Phones Forum.

TCI Singing Wires articles covering the Trimline include:
[Available on-line in the TCI Members Area]

March 2007 - Trimline Cords
August 2008 - Trimline Cord Production
May 2013 - Trimline Base Evolution
August 2013 - Trimline's 50th Anniversary - Design Evolution and Field Trials


No claim is made regarding accuracy or completeness.

If you're enjoying looking at this level of detail and haven't joined one of the phone clubs yet, see the links page.

If you're identifying a phone, you still need to check the internal components as many phones were refurbed and had internal components changed or removed.  If done in a Bell System refurb facility, the code on the bottom was usually repainted or remarked.  Many independent shops or field mods were not remarked with the accurate model number.


 
For color information, see: Phones in color!

This page is a work in progress.  Please send comments, additions and corrections.
Thanks for additions from Fred Adler, Steph Kerman and Sam Etler.

Last update: 5 Aug 2019.


 
TRIMLINE HAND TELEPHONE SETS

Model
Major Functions
(all are desk sets.)
BSP

220
Trimline - 220 rotary
                  hand telephone set

Rotary Hand Telephone Set.

Early production sets required a 2012-type 6-8v transformer for the dial light.

Later production sets had square buttons and used line-powered LED illumination for the dial. Number plates were marked "LED". (See BSPs for details.)

502-303-101
502-303-102
502-320-100
502-320-200
502-322-400

WE Catalog Cards

226
Trimline - Amplified,
                volume control
Rotary Hand Telephone Set with 315-type amplifier and volume control in handset - above the dial.
502-303-102
502-322-400

1220
Trimline - 1220 Touch Tone
                Hand Telephone Set

10-button Touch Tone Hand Telephone Set.

Dial lights required a 2012-type 6-8v transformer.

502-303-101
502-320-100

WE Catalog Cards


2220
Trimline - 1220 Touch Tone
                Hand Telephone Set
12-button Touch Tone Hand Telephone Set.

Early production sets had round buttons, like the 1220 set above. Dial lights required a 2012-type 6-8v transformer.

Later production sets had square buttons and used line-powered LED illumination for the dial.  (See BSPs for details.)

502-303-101
502-303-102

502-305-101
502-320-100
502-322-400

WE Catalog Cards


2226
Trimline - Amplified,
                  volume control

12-button Hand Telephone Set with 315-type amplifier and volume control in handset - above the dial.

502-303-102
502-322-400

WE Catalog Cards






TRIMLINE BASES

Model
Major Functions
(all are desk sets.)
BSP


AC

Trimline - AC wall base

Wall Base.

Handset shown in the "waiting position" on the top edges to keep the line temporarily open.

AC1: "Permanent" wall type (hardwired).

AC2: "Portable" wall type (modular plugs and jacks).

502-303-101
502-305-101
502-321-100
502-321-400
502-322-400

WE Catalog Cards


AD
Trimline - AD desk base

Desk Base.

502-303-101
502-305-101
502-321-100
502-321-400
502-322-400

WE Catalog Cards





 
SPECIALTY SET BASES USING TRIMLINE HAND TELEPHONE SETS

Model
Major Functions
(all are desk sets.)
BSP
AE
Hospital Interphone
Hospital Interphone

Used with Trimline 220-, 1220- or 2220-type hand telephone set.

Bases with 3 or 5 keys were made for different equipment arrangements.

Part of the 3A Communication System. BSPs show the control console and system wiring.
512-535-202
512-535-100

512-535-200
512-535-201
512-535-300

WE Catalog Cards
50A
WE50A-type Conference Phone
50-type Conference Telephone

Used with Trimline 220- or 2220-type hand telephone set.

Included carrying case and two external microphones.

50A: Early production units had retractable handset cords. No A-lead control. Only one microphone could be active at a time.

50A1: coiled modular handset cord. A-lead control. Any combination of microphones could be active. 4-wire operation possible.
        "Portable Conference Telephone"


     Bell Labs Record article: https://www.telephonecollectors.info/index.php/search?q=50a+blr
512-630-110
Issue 1, Jan70

512-630-111

WE Catalog Cards

CD- and SD-69900
5000
5100
WE Transaction
                Telephone Base w/ 2220 Hand Tel Set
from a Bell System Ad
Transaction Telephone

Used with Trimline 220- , 226-, 2220- or 2226-type hand telephone sets.

Includes magnetic stripe card reader and automatic dialer. Optional 5000A dial pad for customer PIN input, selectable TT/DP (Touch Tone / Dial Pulse) dialing.

Note: Several models were produced. Later models had K-type handsets.

     Bell Labs Record article:  https://www.telephonecollectors.info/index.php/search?q=transaction+blr
502-323-400
502-323-401
502-323-403

WE Catalog Cards

CD- and SD-69926-01
758
WE 758 - Elevator
Elevator Telephone

Black only. Rotary dial. Requires D-95334 Outlet Box and D-95332 Frame
WE Telephone
Product Handbook
AL1
Elevator Telephone Base

Use with 220- or 2220-type Trimline hand telephone set. When used with a 220A-3 it makes a complete 758A-3 set.

Replaces 322B and 758A sets. Also used in corridors and building entrances.
502-330-100

WE Catalog Cards
2322
AT&T Elevator Telephone.

Uses a Trimline 210 Hand Telephone Set. Hardwired.

Found Set: Box marked AT&T Little Rock, 10-Jul-95
AT&T
CIB 3155
i1, Sep92
2942
Director - Design Line
Director.

See details on the Design Line page.
Design Line page
950
2950
Noteworthy - Design
                Line
Noteworthy.

See details on the Design Line page.
 Design Line page



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