ETC SP-66

Mil-T-27E
:: D e s c r i p t i o n
Triad high reliability audio transformers provide the durability and precision required in today’s
demanding designs. These transformers are available for a wide variety of applications. The line
of Red Spec audio transformers is designed and constructed to meet the rigid requirements of
MIL-T-27E. These transformers feature an epoxy molded case, gold plated leads and exceptional
operation from 300 Hz to 100 kHz.
:: S p e c i f i c a t i o n s
Red Spec
(MiL-T-27E)
Frequency Response Ranges: 300 Hz to 100 kHz
:: R e d S p e c P r i n t e d C i r c u i t A u d i o T r a n s f o r m e r s
Section
Type
No.
Mil Type
No.
Power
Level
in mW
Matching Impedance
Primary
Secondary
Max. Ma DC
Unbalanced
in Primary
DC Resistance
Primary
Secondary
Overall
Turns
Ratio
Figure
No.
A
SP-4
TF5S21ZZ
10
200,000 CT
1,000 CT
0.0
5,300.0
100.0
14.1:1.0
B
SP-5
TF5S21ZZ
25
50,000 CT
1,000 CT
0.0
3,800.0
75.0
7.1:1.0
3
C
SP-13
TF5S21ZZ
40
25,000 CT/20,000 CT
1,000/800 CT
0.5
1,700.0
115.0
5.0:1.0
3
SP-20
SP-21
SP-22
SP-29
SP-33
SP-42
SP-48
SP-49
SP-50
SP-51
SP-52
SP-66
SP-67
SP-68
SP-69
SP-70
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
10,000 CT
10,000 CT
10,000
10,000 CT
1,000
150 CT
7,500 CT
300 CT
500 CT
900 CT
1,500 CT
10,000 CT
600 CT
10,000
600
600
1,200 CT
2,000 CT
2,000 CT/500§
500 CT
50
12
12
600
600
600
600
10,000 CT
600 CT
10,000 CT/2,500§
600 CT/150§
600
1.0
1.0
1.0
1.0
3.0
10.0
1.0
7.0
3.0
4.0
3.0
1.0
3.0
1.0
3.0
3.0
1,050.0
1,050.0
1,050.0
1,050.0
145.0
18.0
796.0
41.0
67.0
104.0
168.0
1,000.0
72.0
1,000.0
72.0
72.0
200.0
330.0
146.0/168.0§
80.0
8.0
2.7
2.9
98.0
98.0
96.0
92.0
1,300.0
92.0
565.0/650.0§
40.0/45.0§
92.0
2.88:1.0
2.24:1.0
4.48:1.0:1.0
4:47:1.0
4.4:1.0
3.54:1.0
25.0:1.0
1.0:1.42
1.0:1.1
1.22:1.0
1.58:1.0
1.0:1.0
1.0:1.0
2.1:1.0
2.0:1.0:1.0
1.0:1.0
3
3
4
3
1
2
2
2
2
2
2
3
3
4
4
1
SP-128
SP-310
TF5S21ZZ
Shield Only
•
0.1H
•
5.0
15.0
•
•
5
D
E
CT = Center Tap
3
§ Split secondary
:: O u t l i n e D i m e n s i o n s
Te c h n i c a l N o t e s
1. Plug-in terminals are precision spaced to provide
fixed mounting centers.
Figure 1
2. Red Spec transformers are hi-pot tested at 1,000 VRMS.
3. 150 VDC working voltage.
CT Primary
Tap Primary - Tap Secondary
Figure 2
Figure 3
4. Red Spec transformers feature small footprint
base dimensions of .310 by .410 inch.
5. Pin diameter = .020 inch.
Split Windings
Figure 4
Inductor
Figure 5
www.TriadMagnetics.com | 22520 B Temescal Canyon Road, Corona, CA 92883 | Phone 951-277-0757 | FAX 951-277-2757
7 | Audio Transformers
A u d i o Tr a n s f o r m e r s