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Audio & Interstage Transformers - Hermetically Sealed - High Impedance 1,001 Ohms & Up

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Audio Transformer

(TA) L284441-1

Primary Z: 12500/25000 ohms
Secondary Z: 150 ohms
Power: 0.05 watts

Bendix audio transformer. Hermetically sealed. Hook terminals. NSN: 5950-645-5383

Audio Transformer

(TA) 6771600000

Primary Z: 1500 ohms
Secondary Z: 1500 ohms
Power: 30 watts

JB audio transformer. Dual primary & secondary. Two channel. Hermetically sealed, electro-statically shielded. Mfg. P/N: 124P287. NSN: 5950-00-228-0805.

Audio Transformer

(TA) 150-B-1133

Primary Z: 1500 ohms
Secondary Z: 1500 ohms
Power: 0.01 watts

Audio transformer. 1500 ohm : 1500 ohm, 10 wv. 300-6K Hz  Hermetically sealed. NSN: 5950-845-2297.

Primary Z: 2500 ohms
Secondary Z: 250 ohms
Power: 1.5 watts

Freed transformer. 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.

Primary Z: 600 ohms
Secondary Z: 1500 ohms
Frequency Rating: 300 - 3000 Hertz

Freed mil-grade audio transformer.

Audio Transformer

(TA) MT11-AG

Primary Z: 2000/4000 ohms
Secondary Z: 300/600 ohms
Power: 1.6 watts

Microtran audio transformer. NSN: 5950-00-681-7516. New old stock.

Primary Z: 1650/3300 ohms
Secondary Z: 250/500 ohms
Frequency Rating: 15000 Hertz

Altec Lansing scrumptious audio coupling transformer. Sealed. Bottom terminals.

Primary Z: 1750/3500 ohms
Secondary Z: 125 ohms
Power: 10 watts

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.

Primary Z: 175 ohms
Secondary Z: 30000 ohms
Frequency Rating: 200 - 3500 Hertz

Western Electric output transformer. 200 - 3500 Hz frequency response. Made in 1968. NSN: 5950-235-6758.

Audio Transformer

(TPA) 0-40130

Primary Z: 30000/60000 ohms
Secondary Z: 600 ohms
(2) 600 ohms Series and 150 Parallel

Airdesign Inc. audio interstage transformer. Hermetically sealed. Turret terminals. New, old stock.

Primary Z: 2000/4000 ohms
Secondary Z: 300/600 ohms
175 wv to ground maximum

Microtran audio transformer.

Collins Transformer,

(COL) 677-2010-00

Primary Z: 6000 ohms
Secondary Z: 3000/6000 ohms
Power: 20 watts

Collins, CTC audio transformer has lots of miles left. Sealed, bottom terminals, flanges.

Primary Z: 7500 ohms
Secondary Z: 200 ohms
Power: 2.0 watts

Precision Electronics 2 watt audio interstage transformer.

Primary Z: 4000/8000 ohms
Secondary Z: 1250/2500 ohms
Power: 12 watts

Freed coupling transformer. Hermetically sealed, electro-statically shielded. 800 working volts to ground. Level = 12 watts. Removed from new equipment.

Audio Transformer

(TA) F25426-1

Primary Z: 9000 ohms
Secondary Z: 2500/5000 ohms
Power: 1.5 watts

Audio transformer. DCR = 30 ohm, 1.5 watts, 18.5 ma.
NSN: 5950-00-645-1856.

Primary Z: 4000/5000 ohms
Secondary Z: 8000/10000 ohms
Power: 0.1 watts

UTC miniature audio transformer. Electrostatic shield. Does not have threaded base.

Primary Z: 5000/10000 ohms
Secondary Z: 25 ohms
Power: 10 watts

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.

Primary Z: 9000/10000 ohms
Secondary Z: 9000/10000 ohms
Power: 0.1 watts

TRW Pico audio transformer. 105ºC. NSN: 5950-00-449-1742.

Primary Z: 9000 ohms
Secondary Z: 3.2 ohms
Power: 2.0 watts

Atlantic Transformer Corp. audio transformer. (Looks like UTC). 2 watts. Electrostatically shielded. Hermetically sealed. Corner posts 1-3/16" c-c. NSN: 5950-00-615-4876. Beautiful!!

Pico Audio Transformer

(TA) M27/172-35

Primary Z: 5000/10000 ohms
Secondary Z: 2000 ohms
Power: 0.1 watts

TRW Pico interstage audio transformer. 300 ohm to 10 KHz. 10k center tapped to 2k split. 100 mw, 1 ma, 105ºC. 0.337" diameter x 0.469" high. Collins P/N: 677-1521-000.

Pico Audio Transformer

(COL) 677-0500-030

Primary Z: 5000/10000 ohms (10k c.t.)
Secondary Z: 5000/10000 ohms (10k c.t.)
Power: 0.6 watts

Pico audio transformer. Electrostatically shielded. P/N: L8645.

Collins Transformer,

(COL) 677-2300-00

Primary Z: 1500 ohms
Secondary Z: 3750 ohms
Power: 75 watts

Collins, CTC audio transformer has lots of miles left. Sealed, bottom terminals, flanges. 2 pc. available.  4" x 4-1/2" x 5-1/2"H

Primary Z: 14000 ohms
Secondary Z: 35000 ohms
Frequency Rating: 11000 Hertz

Audio transformer. Hermetically sealed. 2 : 1 ratio. Turret terminals and posts on bottom. NSN: 5950-00-648-5705.

Primary Z: 15000 ohms
Secondary Z: 47500/95000 ohms
Frequency Rating: 200 - 10000 Hertz

UTC audio transformer. Round. Hermetically sealed. Hook terminals. 1.175" c-c ears. NSN: 5950-016-4444.

Primary: 15k ohms @ 4 madc
Secondary: 4 terminals - 95k ohms split,
200 - 10,000 Hz, +11 dBM, 175 pk wv
Dimensions: 7/8"D x 1-3/8"H

Primary Z: 9000/18000 ohms
Secondary Z: 165 ohms
Power: 80 watts

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 Z: 9000/18000 ohms
Secondary Z: 125 ohms
Power: 175 watts

Thordarson Grade 1 Class A plate coupling audio transformer. Sealed. Bottom terminals.

<blockquote> ⢠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 </blockquote>

Audio Output

(TA) T101

Primary Z: 20000 ohms
Secondary Z: 600 ohms
Power: 2.0 watts

Freed 17042 audio output.

Audio Transformer

(COL) 677-0425-00

Primary Z: 10000/20000 ohms (20k c.t.)
Secondary Z: 600 ohms
Frequency Rating: 200 - 20000 Hertz

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

Audio Transformer

(TA) L-382521

Primary: 18.5ma DC winding current
Secondary: 20ma DC winding current
Frequency Rating: 200 - 3000 Hertz

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.

Audio Transformer

(TA) L284341-1

Primary Z: 10000 ohms
Secondary Z: 60000 ohms
Power: 0.5 watts

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.

Primary Z: 50 ohms
Secondary Z: 50000 ohms
Frequency Rating: 50 - 10000 Hertz

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

<blockquote> ⢠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 </blockquote>

Primary Z: 500 ohms (tap for 200 ohms)
Secondary Z: 50000 ohms
Power: 0.1 watts

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

Microphone Adapter &

(MIC) 57A120D1

Primary Z: 82 ohms
Secondary Z: 100000 ohms
Frequency Rating: 300 - 20000 Hertz

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.

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

Primary Z: 75 ohms
Secondary Z: 100000 ohms
Frequency Rating: 200 - 500 Hertz

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

Audio Transformer

(TA) GAI-7203

Primary Z: 600 ohms
Secondary Z: 120000 ohms
Frequency Rating: 400 - 3000 Hertz

Audio transformer. 400 - 3000 cps. Hermetically sealed, electrostatically shielded. Gold turret terminals. NSN: 5950-00-647-5943.

<blockquote> ⢠Primary: 600 ohms C.T. @ 30 ma
⢠Secondary: 120,000 ohms C.T., 18 dBM
⢠Dimensions: 1.5" x 1.26" x 2.4"H </blockquote>

Primary Z: 333 ohms
Secondary Z: 120000 ohms
Frequency Rating: 60 - 10000 Hertz

Freed dual primary audio transformer.
NSN: 5950-00-647-6026.

Primary: 13v / 400 Hz Max
Secondary Z: 2000 ohms
Secondary has two split 2000 ohm coils

ADC audio transformer. 6 solder hooks. Threaded mounting studs. ADC P/N: A16176.

Primary Z: 300/600 ohms
Secondary Z: 250000 ohms
Power: 5.0 watts

Centroid Inc. audio input transformer. Sealed. Bottom terminals.

Karas vintage harmonik audio transformer. All stage ratio. New condition. Made in 1925. Only 1 available!

Primary Z: 1600 ohms c.t.
Secondary Z: 800 ohms
Power: 2.5 watts

Microtran audio transformer. 2.5 watt, 150 Hz-20,000 Hz. Hermetically sealed. Mounts by 4 bottom 6-32 studs @ 1.18" centers. DLA900-88-A-A386.

Primary Z: 293k ohms
Secondary Z: 600 ohms
Frequency Rating: 300-3.5K Hertz

UTC/TRW audio transformer. 300Hz (min) to 3.5KHz (max). Hermetically sealed. Internal electrostatic shield brought out to terminal. Turns ratio 1:22.3. Great headphone transformer for high impedance vacuum tube. DLA900-84-P-7603. K&S G-C_92.

Primary Z: 10000 ohms
Secondary Z: 365 ohms
Power: 9 watts

Microtran Audio Transformer. Hermetically sealed. 70 Hz to 20k Hz. 9 watts. Bottom turret terminals. 2-1/4" x 2" x 3-1/8". Mounting centers 1.68" x 1.43" on 8-32 studs. Made in 1970. Alt. P/N: TF4RX13FA, 1754680.

Primary Z: 5k ohms
Secondary Z: 600 ohms
Dimensions: 2-1/4" x 2-3/8" x 3"H

Stancor audio matching transformer. Primary: 5000 ohms, 4.15 Hy, 1500 turns (#34 wire). 115 ohms DCR. Secondary: 600 ohms c.t., 40mA, 82 turns (#25 wire), 0.5 ohms DCR. Hermetically sealed. 2-1/4" x 2-3/8" x 3"H.

Audio Transformer

(TA) TF4RX13YY

Primary Z: 4000 ohms
Secondary Z: 600 ohms
3mA DC

Microtran audio transformer. 4k Ohm c.t. to 600 Ohm c.t. 3mA DC. Hermetically sealed. 7/8"D x 1-7/16"H.