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Transformers
Home Page Index Page Transformers Audio & Interstage Transformers
 
 
Audio & Interstage Transformers

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.
 

Tube to Line Transformer
50 / 125 / 200 / 333 / 500 ohm

(TA) A3024
Merit tube to line transformer.

• Primary: 50 ma max, 1-2-4 = 20,000 ct,
1-3 = 10,000 ohms, 1-2 = 5,000 ohms
• Secondary: 50 / 125 / 200 / 333 / 500 ohm
• Dimensions: 2-5/8" x 3" x 3-1/8"H
$18 each
 
$49 each

Audio Transformer
(TA) A-130199-77
Autodyne Mfg. Co. audio transformer. Unknown specs. Hermetically sealed. Turret terminals / posts on bottom. Electrostatically shield core. Primary labeled "FIN" & "ST", dual winding. Secondary: labeled "GND & LOW" and has shield terminal. 3-1/4" x 3-5/8" x 4-1/4"H. NSN: 5950-00-647-8063.
 

Audio Transformer
150 & 600 Ohm

(TA) 7496211P001
ADC audio transformer. Hermetically sealed.

• Primary: 30 ohm, 30 dBm, 30 Hz - 15 KHz
• Secondary: 150 & 600 ohm
• Dimensions: 2-1/4" x 2-5/8" x 1-7/8"H
$10 each
 
$19 each

McIntosh Labs
Power Transformer
(TP) 043-155
McIntosh Labs power transformer. Type M215. Made by Bendix for McIntosh. Military boxed from 1950's. Only 3 on hand. NSN: 5950-00-922-8488.
 

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
$395 each
 
$89 each

Driver Transformer
30 watts

(TA) A3121
Merit universal driver transformer. 30 watts. 600 ohm line to class B grids. Variable ratios: 11 variations from 1: 0.75 to 1: 3.0. Dimensions: 3" x 4" x 3-1/2"H.
 

Driver Transformer
15 watts

(TA) A3120
Merit universal driver transformer same as left except 15 watts. 600 ohm line to class B grids. Variable ratios: 11 variations from 1: 0.75 to 1: 3.0. Dimensions: 3" x 4" x 3-1/2"H.
$65 each
 
$45 each

Audio Output Transformer
10 watt

(TA) 155-149496
Ensign audio output transformer. PC mount. 10 watt. 10 tap input with DCR's ranging from 200 to 700 ohm. We do NOT know the corresponding impedances. 8 ohm output leads with spade terminals. 1-9/16" x 1-7/8" x 1-1/4"H.

NOTE: This is a protected component and a specific drawing is not available.
 

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
$8 each - $7 (10+)
 
$165 each

Line Transformer

(TA) 24571
70.7 volt line transformer.

• Input: 0.5 - 1 - 2 - 4 or 8 watts
• Output: 4 - 8 or 16 ohms
• Dimensions: 1-1/2" x 1-5/8" x 1-7/8"H
 

Audio Transformer
600 ohm : 600 ohm c.t.

(TA) A16487
ADC audio transformer. 600 ohm : 600 ohm center tapped. Sold in matched pairs. 9/16" cubed. Gates P/N: 478-0282-000.
$9.95 each
 
$35 per pair

Output Transformer

(TA) TA42
Stancor output transformer. 300 mw.

• Primary: 500 CT - DCR 40 ohm
• Secondary: 4 / 8 / 16 ohm - DCR 1.2 ohm
• Dimensions: 3/4" x 1" x 3/4" high
 

Crossover Network
16 Ohm / 3500 cps

(TA) X36
Electro-Voice audio cross-over network transformer. Sealed. Terminals side bottom. 2 pcs. available.

• 16 ohm, 3500 cps
• Dimensions: 3-1/4" x 3-1/2" x 3-1/2"H
$35 each - $30 (3+)
 
$49 each

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
 

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
$25 each - $21 (3+), $18 (10+)
 
$109 each

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
 

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
• Seconary A: 250,000 ohm
• Dimensions: 3-1/4"D x 4"H
$129 each - $117 (3+)
 
$109 each - $99 (3+)

Audio Output

(TA) T101
Freed 17042 audio output.

• 20k ohm @ 5ma
• 600 ohm, 500v
• 3 dB, 50 - 12 kHz
• Dimensions: 2"D x 2-1/4"H
 

Audio Transformer

(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
$39 each
 
$12 each - $10 (3-9), $9 (10+)

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
 

Audio Transformer
1k, 2k, 4k, 8k, 32k Ohm input / 0.5, 2, 8 Ohm output

(TA) AT1973
Hytronics 50 watt audio transformer.

• 70Hz - 10 KHz
• Input: 1k, 2k, 45, 8k, 32k ohm
• Output: 0.5, 2 8 ohm
• Dimensions: 3-1/4" x 2-1/4" x 2"H
$45 each - $39 (3+), $35 (10+)
 
$49 each

Input Transformer
250 Ohm Primary / 2500 - 4600 Ohm Secondary

(TA) T7185
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
 

Input Transformer
18 ohm DCR : 24 ohm DCR
(TA) L12-200-16027
Great Electrical Corporation input transformer. 18 ohm DCR : 24 ohm DCR. Not exactly sure what the impedance is of this little jewel. It is excess from a 1980's era manufacturer. 5/8" x 9/16" x 9/16"H. Made in Taiwan.
$10 each - $9 (3+), $8 (10+)
 
50¢ each - 40¢ (25+), 33¢ (100+)

Audio Transformer
280wv

(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
 

Audio Transformer

(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
$24 each - $21 (6+)
 
$35 each

Mini Molded PC Mount
Audio Transformer

(TA) SMB528032
Torotel audio transformer.

• 800 ohm: 800 ohm CT
• 500 mw maximum
• Dimensions: 3/4" x 7/8" x 5/8"H
 

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
*** SOLD OUT ***
 
 
$10 each - $9 (3+), $8 (10+)

Antique Hollywood Transformer
"Hollytran"

(TA) 2827
Hard to find antique Hollywood Transformer "Hollytran." Interstage transformer for vacuum tube amplifiers. Octal plug base. 2" x 2-3/4" x 3"H. Made in 1950's.

• Primary: 200 - 50 ohm
• Secondary: 120,000 - 30,000 ohm
$65 each

(TA) 2828
"Hollytran" transformer same as above except:

• Primary: 25,000 - 6,250 ohm
• Secondary: 20 - 5 ohm
 

Antique Hollywood Transformer
"Hollytran" (cont'd)

(TA) 2829
"Hollytran" transformer same as left except:

• Primary: 10,000 - 2,500 ohm
• Secondary: 100,000 - 25,000 ohm
$75 each

(TA) 2830
"Hollytran" transformer same as above left except:

• Primary: 200 - 50 ohm
• Secondary: 100,000 - 25,000 ohm
$109 each

(TA) 2831
"Hollytran" transformer same as above left except:

• Primary: 25,000 - 6,250 ohm
• Secondary: 50 - 5 ohm
$85 each
 
$85 each

UTC Audio Transformer
500 Ohm ct to 600 Ohm ct

(TA) SS0-19
UTC audio transformer.

• 100 mw, 10 ma, 175wv
• 500 ohm CT to 600 ohm CT
• Dimensions: 1/2" x 3/4" x 3/4"H
 

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
$4 each
 
$24 each - $21 (3+)

PC Mount Audio Transformer
1 : 1 Ratio / 470 µH

(TA) 1361-1-470
Ferrite cored 470 µH: 470 µH PC mount audio transformer.

• 0.05 ohm DC resistance
• 2.2 amps
• Ratio: 1 : 1 / 470 µH
• Dimensions: 7/8" x 3/4" x 3/4"H
 

Raytheon Audio Transformer
600 Ohm to 1k Ohm

(TA) 292-4961G1
Raytheon audio transformer.

• Primary: 600 ohm (130 ohm DCR)
• Secondary: 1000 ohm (25 ohm DCR)
• 9mw, 175 wv
• Dimensions: 1-3/4" x 1-5/8" x 2-5/8"H
$2 each - $1.75 (3+), $1.39 (25+)
 
$19 each

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
 

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
$125 each
 
$95 each
For More Information
E-mail: grinnell@surplussales.com

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