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Audio & Interstage Transformers - Hermetically Sealed
High Impedance - 1,001 Ohms & Up
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Audio Transformer
250 Ohm ct / 600 Ohm ct

(TA) 224-2M
ADC mil-grade audio transformer. Balanced 600 ohm output. Blue epoxy case.

• 60 Hz - 10k Hz, 82 ma, 0.25w, 175wv
• Dimensions: 1-1/16"sq x 7/8"H
 

Audio Transformer
1500 ohm : 1500 ohm - 10 mw
(TA) 150-B-1133
Audio transformer. 1500 ohm : 1500 ohm, 10 wv. Hermetically sealed. NSN: 5950-845-2297.
$24 each - $21 (3+)
 
$18 each

Transformer
2500 ohm : 250 ohm
(TA) 27404
Freed transformer. 40 ma. 2500 ohm : 250 ohm. 500v, 1.5 watts. 1-3/8" x 1-3/8" x 2". Loral P/N: 450-2046.
NSN: 5950-00-646-5039.
 

Audio Transformer
600 Ohm : 3k Ohm

(TA) 33114
Freed mil-grade audio transformer.

• 600 ohm primary with shield to dual 1500 ohm (3,000 ohm total) secondary.
• 0.5 dB 0.3 - 3 KHz
• Dimensions: 1-7/16" diameter x 2"H
$18 each
 
$45 each - $39 (3+), $35 (10+)

Altec Lansing Plate Coupling
Primary Z = 3300 ohm c.t.
Secondary A = 250 / 500 ohm

(TA) TMJ-217A
Altec Lansing scrumptious audio coupling transformer. Sealed. Bottom terminals. New. 26 available.

• Frequency Response: 15 KHz
• Primary Z: 3300 ohm CT
• Secondary A: 250 / 500 ohm
• Dimensions: 4-1/4" x 4-3/8" x 5-1/8"H
 

Lionel Plate Coupling
Primary Z = 3.5k ohm c.t.
Secondary A = 125 ohm

(TM) CU-66/UR
Lionel Corporation Grade 1 Class A plate coupling transformer. Sealed. Made in 1945 for US Army Signal Corps by Lionel, the model train manufacturer turned military supplier.

• 10 watts
• Primary Z: 3.5k ohm CT
• Secondary A: 125 ohm
• Dimensions: 2"sq x 2-1/2"H + terminals
$129 each - $117 (3+)
 
$25 each - $21 (3+), $18 (10+)

Output Transformer
200 - 3500 ohm Frequency Response

(TA) 186B
Western Electric output transformer. 200 - 3500 ohms frequency response. Made in 1968. NSN: 5950-235-6758.

• Input: 175 ohms (terms 1-2),
107 ohms DCR, 1.2 Hy
• Output: To 30,000 ohms (terms, 3-4, 5-6),
4850 DCR
• Dimensions: 1-5/8" x 3" x 4"H
 

Collins Transformer,
as removed
1,500 ohms : 3,750 ohms / 75w

(COL) 672-2300-00
Collins, CTC audio transformer has lots of miles left. Sealed, bottom terminals, flanges. 2 pc. available.

• 1,500 ohms : 3,750 ohms / 75w
• 100 - 5,000 Hz, ±1 dB
• Ratio: 1 : 1.59
• 3 kv high pot
• Dimensions: 4" x 4-1/2" x 5-1/2"H
$95 each
 
$125 each

Mini Molded PC Mount
Audio Transformer

(TA) MMT11M
Microtran audio transformer.

• 4000 ohm CT: 600 ohm CT
• 5 madc, 28 dBm
• 200 Hz - 15 KHz
• 175 wv to ground
• Dimensions: 3/4" x 7/8" x 1/2"H
 

Input Transformer
250 Ohm Primary / 2500 - 2500 / 4600 Ohm
 

(TA) A7185
ADC audio input transformer.

• Primary: 2500 ohm to 2500 ohm / 4600 ohm
• Secondary: 100 mw
• Dimensions: 1-1/8" x 1-5/8" x 2-1/4"H
$10 each - $9 (3+), $8 (10+)
 
$10 each - $9 (3+), $8 (10+)

Collins Transformer,
as removed
6,000 ohms : 6,000 ohms c.t. / 20w
 

(COL) 677-2010-00
Collins, CTC audio transformer has lots of miles left. Sealed, bottom terminals, flanges. 2 pc. available.

• 6,000 ohms : 6,000 ohms c.t. / 20w
• 200 - 5,000 Hz, ±1 dB
• Ratio: 1 : 1
• 3 kv high pot
• Dimensions: 2-3/4" x 2-5/8" x 3-3/8"H
 

Audio Transformer
280wv @ 0.001 adc

(TA) 1752
Precision Electronics 2 watt audio interstage transformer.

• 7.5k ohm : 200 ohm
• 280wv, 0.001 adc
• Dimensions: 1-1/4" square x 1-3/4"H
$95 each
 
$24 each - $21 (6+)

Freed Coupling Transformer
2500 ohm CT Nominal @ 50 ma

(TA) 31002
Freed coupling transformer. Hermetically sealed, electro-statically shielded. Working volts to ground = 800v. Level = 12 watts. Removed from new equipment.

• Primary: 8000 ohm ct nominal @ 50 ma
• Secondary: 2500 ohm ct nominal @ 50 ma
• Dimensions: 2-7/8" x 3" x 5"H
 

Audio Transformer
DCR = 30 ohm / 1.5 watts / 18.5 ma
  Bottom view

(TA) F25426-1
Audio transformer. DCR = 30 ohm, 1.5 watts, 18.5 ma.
NSN: 5950-00-645-1856.

• Primary: 9000 ohm
• Secondary: 5000 ohm
• Dimensions: 3.5" x 2.75" x 3.5"H
$89 each
 
$35 each

Audio Transformer
4k / 5k c.t. to 8k / 10k c.t.

(TA) DO-T52
UTC miniature audio transformer. Electrostatic shield. Does not have threaded base.

• 4k / 5k CT to 8k / 10k CT
• NSN: 5950-00-837-5497
 

Audio Frequency Transformer
10k c.t. to 25 ohm
(TA) 75263
UTC audio frequency transformer. 10k C.T. to 25 ohm. 10 watts. 1:20 ratio. Hermetically sealed. 1-1/2"D x 2-3/8"H. NSN: 5950-231-4763.
$12 each - $10 (3+), $9 (10+)
 
$75 each

Freed Matching Transformer
165 ohm, 200 ma, 80 watts

(TA) 31001
Freed matching transformer. 200 ma. Level = 80 watts. Hermetically sealed. Working volts to ground = 1,100v. Made for 811A circuit. Removed from new, boxed equipment.

• Primary: 18,000 ct
• Secondary: 165 ohm
• Dimensions: 5" x 4" x 6-1/4"H
 

Thordarson Plate Coupling
Primary Z = 18k ohm c.t. (5300 vrms)
Secondary A = 125 ohm (1500 vrms)

(TA) T56626
Thordarson Grade 1 Class A plate coupling audio transformer. Sealed. Bottom terminals.

• Frequency Response: 175 watts 500 CPS to 6 KHz
• Primary Z: 18k ohm CT (5300 vrms)
• Secondary A: 125 ohm (1500 vrms)
• Dimensions: 3-3/4"D x 4-1/2"H
$165 each
 
$109 each

Audio Transformer
600 / 600 ohm

(COL) 677-0425-00
Chicago Transformer audio transformer. Hermetically sealed. Rounded corners. Terminals & posts on bottom. 200 - 20,000 Hz I2DB, 265 pwv. NSN: 5950-00-645-0737.

• Primary: 20k c.t., 100mw, 10 ma Balanced
• Secondary: 600 / 600 ohm
• Dimensions: 1.515" x 1.515" x 2.14"H
 

Audio Output
20k ohm @ 5 ma / 600 ohm / 500v
 

(TA) T101
Freed 17042 audio output.

• 20k ohm @ 5 ma
• 600 ohm, 500v
• 3 dB, 50 - 12 kHz
• Dimensions: 2"D x 2-1/4"H
$59 each - $52 (3+)
 
$39 each

Audio Transformer
10k : 60k / 150 - 4500 Hz / 0.5 watt
(TA) L284341-1
Bendix audio transformer. 10k : 60k. 150 - 4500 Hz. 0.5 watt. Hermetically sealed. 0.875" square x 2.5" high. Made in 1954. NSN: 5950-645-0716.
 

Plate to Grid Audio Transformer
60k / 500v

(TA) 0-4
UTC plate to grid audio transformer. 30 - 20,000 Hz. "Ouncer" Alt. P/N: 910033.

• Primary: 15k
• Secondary: 60k, 500v
• Dimensions: 7/8" x 1-1/8"H
$39 each - $35 (3+)
 
$24 each

Audio Transformer
Pri: 9k ohms, 0.027a / Sec: 3.2 ohms, 0 madc

(TA) M-1407
Atlantic Transformer Corp. audio transformer. (Looks like UTC). 2 watts. Electrostatically shielded. Hermetically sealed. Corner posts 1.25" c-c. NSN: 5950-00-615-4876. Beautiful!!

• Primary: 9k ohms, 0.027 amps
• Secondary: 3.2 ohms, 0 madc
• Dimensions: 1.5" x 1.5" x 2-1/4"H
 

Audio Input Transformer
Pri: 500 ohms w/tap @ 200 ohms / Sec: 50k ohms

(TA) 467737
ITC audio input transformer. Hermetically sealed. Turret post terminals. 500 vrms. 0.1 watt, 0.1 - 15 kc. NSN: 5950-645-1933.

• Primary: 500 ohms with tap 200 ohms
• Secondary: 50k ohms
• Dimensions: 1.3" x 1.6" x 1.6"H
$69 each
 
$49 each

Audio Transformer
74 / 10 volts / 20 ma
 

(TA) L-382521
Westinghouse audio transformer. 74 / 10 volts, 20 ma. Turns ratio 1 : 3-13/16. 200 - 3000 Hz. 2" diameter x 2.75" high. Made in 1967. NSN: 5950-00-647-7680.

NOTE: You will need a 2" capacitor mounting clamp. (CMH) CLAMP-2. Click here.
 

UTC Audio Transformer
50k Ohms

(TA) 92157
UTC audio transformer. Hermetically sealed. Electrostatically shielded brought out to terminal. New, military surplus from the 1950s. NSN: 5950-227-7791.

• Primary: 50 ohms
• Secondary: 50k ohms, 50 Hz - 10 KHz
• Ratio: 1 : 31-6/10
• Dimensions: 1-3/4"D x 2-1/2"H
$25 each
 
$75 each

Microphone Adapter &
Audio Transformer
100,000 ohms

(MIC) 57A120D1
Microphone adapter and Freed audio transformer. 300 - 20,000 ohms. Includes shield box plus 4 pin flange mount female jack (MS3102A14S) mating with 4 pin inline male (MS3106A14S). New surplus. NSN: 5821-591-3786.

• Primary: 82 ohms, 50 ma
• Secondary: 100,000 ohms
• Dimensions: 2-1/8" x 2-3/4" x 1-5/8"H
 

Audio Transformer
100,000 ohms

(TA) T-1935
UTC audio transformer. Electro-statically shielded. Hermetically sealed. 200 - 500 Hz, 0.06 watt, 150 wv. NSN: 5950-00-328-9795.

• Primary: 75 / 150 ohms
• Secondary: 100,000 ohms
• Dimensions: 1-7/8" x 1-7/8" x 2-1/2"H
$65 each
 
$67 each

Audio Transformer
120k ohm c.t. / 60 Hz / 10 KHz

(TA) 14795
Freed dual primary audio transformer.
NSN: 5950-00-647-6026.

• Primary 1: 333 ohm / 500 ohm
• Primary 2: 50 ohm / 125 ohm
• Secondary: 120k ohm CT, 60 Hz - 10 KHz
• Ratio: 1 : 15-1/2
• Dimensions: 2-5/8" x 2-1/4" x 3"H
 

Centroid Inc. Audio Input
Primary Z = 300 / 600 ohm c.t.
Secondary A = 250,000 ohm
 

(TA) 81175-501
Centroid Inc. audio input transformer. Sealed. Bottom terminals.

• 5 watts max
• Frequency Response: 50 CPS to 10 KHz
• Primary Z: 300 / 600 ohm CT
• Secondary A: 250,000 ohm
• Dimensions: 3-1/4"D x 4"H
$35 each
 
$109 each - $99 (3+)