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140 Series
143-146 Series

Key Features (140 Series):

Part Number

Obsolete
Status

Application

Nominal Impedance
(Ohms)

Overall
Turns Ratio

Primary

Secondary

Pri. to Sec.

140A
Limited Availability (check stock)
Voice Coil to Single Grid
4
60000
1:122
140B
No Longer Available
Dyn. MIC. to Single Grid
30
60000
1:45
140C
No Longer Available
MIC. to Single Grid
50
60000
1:34.5
140H
No Longer Available
Bridging Line to P.P. Grids
10000
40000 ct
1:2
140K
Limited Availability (check stock)
MIC. to Single Grid
150
60000
1:2
140M
No Longer Available
CRYS, MIC. to Base
100K
1500
8:1
140N
Limited Availability (check stock)
Dyn. MIC to Base
50
1500
1:5.5
140P
No Longer Available
Line to Base
150/600
600/2400
1:2
140Q
Limited Availability (check stock)
Line to Line
600 ct
600 ct
1:1

Link here to: upgraded studio grade - 140 "EX" series


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Key Features (143-146 Series):

Part Number

Applicaton

Nominal Impedance
(Ohms)

Pri. D.C.
(*1) ma

D.C. Resistance
(Ohms) +/- 15%

Output
mW

Schematic

Primary

Secondary

Primary

Secondary

143B Input
3.2
4000
0
0.4
245
15
1
143D Input
200K
1000
0
4500
30
25
1
143H Driver
1500
500 ct
4
111
24
30
2
143J Driver
3000
1000 ct
2.6
265
53
30
2
143L Driver
10000
200 ct
1.5
720
9
30
2
143N Driver
10000
2000 ct
1.5
720
89
30
2
143R Driver
25000
600 ct
1
1890
25
30
2
144B Output
200 ct
3.2
10
10
0.33
150
3
144D Output
300 ct
3.2
9
15
0.33
150
3
144F Output
500 ct
3.2
6
27
0.33
150
3
144G Output
500 ct
8
6
27
0.9
150
3
144H Output
500 ct
50
6
28
7.3
150
3
144I Output
600 ct
150 ct
6
45
8.2
150
4
144P Output
10000
3.2
5
575
0.5
50
1
144Q Output
10000
8
5
575
0.9
50
1
144S Output
20000
8
3.5
1240
0.9
50
1
145A Driver
100
200 ct
45
14
19
100
2
145B Driver-Output
600
600
18
30
38
200
1
145C Input
50000
1500 ct
1
2400
52
50
2
145D Input
200K
1000
0.5
3600
33
10
1
145E Input-Output
600 ct
600 ct
5
65
83
200
4
145F Driver
600 ct
200 ct
20
45
9
135
4
145G Driver
2000
200 ct
12
140
9
135
2
145H Driver
2000
500 ct
12
148
17
135
2
145J Driver
4000
600 ct
8
340
24
135
2
145L Driver
4000
2600 ct
8
340
100
135
2
145N Driver
10000
2000 ct
5
700
89
135
2
145O Driver
15000
200 ct
4
850
10
135
2
145P Driver
20000
1000 ct
3.5
1180
50
135
2
145R Driver
20000
2000 ct
3.5
1180
89
135
2
146B Output
48 ct
3.2
20
2.4
0.3
700
3
146C Output
48 ct
8
20
2.4
0.7
700
3
146D Output
100 ct
3.2
14
4.4
0.3
700
3
146E Output
100 ct
8
14
4.4
0.7
700
3
146F Output
250 ct
3.2
8
11
0.3
700
3
146G Output
250 ct
8
8
11
0.7
700
3
146H Output
500 ct
3.2
6
26
0.3
700
3
146I Output
500 ct
8
6
26
0.7
700
3
146J Output
1000 ct
3.2
4
56
0.3
700
3
146K Output
1000 ct
8
4
56
0.7
700
3
146N Output
2000 ct
8
3
97
0.7
700
3
146S Output
4000 ct
8
2
220
0.7
700
3

Notes: *1 - For output transformers this figure is maximum unbalance


Mechanical & Schematic Data:

143-146 Line Art

Series
Number

Dimensions (Inches)

A

B

C

D

143...
1.35
0.69
0.69
1.06
144...
1.35
0.69
0.69
1.06
145...
1.63
0.88
0.81
1.38
146...
1.63
0.88
0.81
1.38

143-146 Schematic
143-146 Schematic
143-146 Schematic
143-146 Schematic
Schematic 1
Schematic 2
Schematic 3
Schematic 4



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