ERICSSON
TELEPHONE No. N1010A & N1010B
 


Automatic Table Telephone

n1010a.jpg (11535 bytes)The casework, micro-telephone and terminal block are of moulded, black Bakelite which is easy to keep clean and does not become shabby through long usage.

The mounting of the dial harmonises with the instrument. The dial is placed at such an angle that the figures are not obscured by the finger plate.

The micro-telephone is fitted with a detachable receiver and an "inset" transmitter.

The ringer, 1000 ohms, is fitted on the inside of the base which is cut away to permit of greater audibility, also a condenser 2pF, induction coil and switch are the other interior fitments.

All terminals are enclosed.

Micro-telephone N5852
Micro-telephone cord N4021
Transmitter Inset N7745
Mouthpiece N8633
Receiver N6815
Receiver earpiece N4443
Receiver diaphragm N4400
Terminal block cord N4106
Terminal block N3158
Condenser N3652A

Dimensions 6.5 x 9.25 x 5.75 inches
Weight 5.75lb

Introduced in the early 1930's.

Circuit Diagram N14275 is dated December 1931.

Taken from the Ericsson Catalogue No. 26 - 1935 Supplement

Click here for an Ericsson Bulletin article on the above telephone

Click for more information on this telephone

Click here for the circuit diagram

How to convert all N1010 sets to work on the UK plug and socket system

 


How to Identify a N1010 Style telephone

This style of telephone was made in a number of models and variants.  The problem was that not all have diagrams and not all have the part number on them.

The table below gives identifying features of all the known variants.

Model No. Terminal Block Switch hook Contacts Induction Coil Bell Diagram Date Diagram No.
             
N1010 (Auto)
N1380 (CB)
Straight with 7 terminals
Marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal block marked L1, L2, C and B.
2 x Make 6 terminal.
Terminal 5 not connected
Yes March 1931 N13502
             
N1010A (Auto)
N1380A (CB)
Straight with 7 terminals
Marked TR, R, T, 1, 2, 3 and 4.
2 x Make 6 terminal.
Terminal 5 not connected.
No Bell or capacitor April 1931 N14275
             
N14387 Straight with 7 terminals
Marked TR, R, T, 1, 2, 3 and 4.
2 x Make 6 terminal.
Terminal 5 not connected.
No bell or capacitor August 1931 N14387
             
N2180 (Dial)
N8420 (CB)
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And two 4 way blocks.
1 x Make and 1 x Change-over 6 terminals.
Terminal 5 may not be connected.
Yes December 1932 N14321
             
N20129 (Auto)
With 1 press button on case
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block.
2 x Make 6 terminal.
Terminal 5 not connected.
Yes December 1931 N15305
             
N20130 (Auto)
With 1 press button on case
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block.
2 x Make 6 terminal.
Terminal 5 not connected.
No bell.
DC Buzzer instead
December 1931 N15306
             
N20129B (Auto)
With 2 press buttons on case
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block.
2 x Make 6 terminal.
Terminal 5 not connected.
Bell February 1932 N15456
             
N20234 (Battery)
With 1 press button in dial black plate
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block marked ZE and MC.
1 x Make and 1 x Change-over 6 terminal.
Terminal 5 and 6 not connected.
DC Bell August 1933 N16949
             
N1590 (Call and Reply).
With 1 press button
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block marked 1, 2, B and B.
2 x Make None DC bell or Buzzer November 1933 N17293
             
N1590A mod
(Call and Reply)
With 1 press button
Straight with 7 terminals, marked TR, R, T, 1, 2, 3 and 4.
And a 4 terminal horse shoe shaped line cord terminal block marked 1, 2, B and B.
1 x Make and 1 x Change-over None DC Bell or Buzzer October 1933 N17992
             
N1010B (Auto) Straight with 6 terminals, marked 1 to 6.
And a 4 terminal horse shoe shaped line cord terminal block, marked A+, B- and EB.
1 x Make None.
Handset cord only has two wires.
Yes July 1934 N18835
             
N20405 (Auto) L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And two 4 terminal horse shoe shaped line cord terminal block.
1 x Change-over None.
Handset cord only has two wires.
No Bell.
Relay instead
September 1934 N19477
             
N1010 (Auto)
N1380 (CB)
L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And a 4 terminal horse shoe shaped line cord terminal block.
2 x Make 6 terminals Yes April 1935 N19995
             
N1592 (Call and Reply) L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8. 1 x Make, 1 x Break and 1 x Change-over None No April 1935 N50623
             
N1590A and N1591A (Call and Reply)
1 press button
L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And a 4 terminal oblong shaped line cord terminal block, marked 1, 2, B and B.
2 x Make None DC Bell or Buzzer September 1935 N50759
             
N20259 (Operators) L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8. 2 x Make None No February 1936 N52239
             
N20543 L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And two 4 terminal horse shoe shaped line cord terminal blocks, each marked 1, 2, 3 and 4.
2 x Make and 1 x Chang-over 6 terminals.
Terminal 5 not connected.
No Bell.
Relay instead
March 1936 N52263
             
N1380A mod (Auto)
 
L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And two 4 terminal horse shoe shaped line cord terminal blocks, each marked 1, 2, 3 and 4.
1 x Break and 1 x Change-over None No bell.
Relay and lamp instead
August 1936 N52614
             
N1380 Mod (CB) L shaped and similar to the BPO 232 with 8 terminals, marked 1 to 8.
And a 4 terminal horse shoe shaped line cord terminal block, marked L1, L2, C and B.
2 x Make 6 terminals.
Terminal 5 not connected.
No August 1936 N52615


 


Additional Information

Similar sets can be found without an induction coil.  These are wired to diagram N18835 and can be identified easily as the handset cord only has two wires connected.

The microphone and receiver are connected in series so the transmission would not be to the British Post Office standards.

This type of telephone is normally referred to as a 'cheapened set' and would most probably have been used on Private Automatic Exchanges as it would not have met the transmission standards of the GPO.

The pictures below show a N1010B with no induction coil, as supplied to Telephone Rentals.  The transmitter and receiver are in series.  Issue 2 of diagram N18835 is dated 1934.

Introduced circa 1934.

Telephone Rental model with no induction coil
 
 

 

 
 
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Last revised: November 07, 2020

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