<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%> SOWTER VINTAGE AUDIO TRANSFORMERS
Sowter vintage audio trnasformers
Sowter Audio Transformers (E A Sowter Ltd.)

VINTAGE RECORDING STUDIO PRODUCTS
replacement vintage audio transformers A NEW SERVICE for recreation or replacement or repair of vintage studio compressors, microphone amplifiers, equalizers, bridging and distribution amplifiers etc using tubes or transistors. There may be small differences in dimensions, taps and in the detailed specification but we are confident these transformers will have the "original sound"

CUSTOM DESIGN SERVICE We are extending our custom design service to include this type of transformer. We will not make a charge for the design provided we accept the requirement as being of general interest. We can work from circuits, actual transformers loaned to us or from specifications. We may offer the service on a "best efforts" basis if we cannot be sure of meeting a particular performance.

EQ INDUCTORS  Please see separate page

GENERIC PRODUCTS Many manufacturers used generic transformers which you may find on our Pre-Amp and Line Amp page or our Pro-Audio page. Please feel free to contact technical support for assistance.

PRICE and SHIPPING cost can be found by clicking on the type number or using SEARCH an using the type number as the search word

PRO VINTAGE PRODUCTS 
Type Equipment Description Voltage
ratio		 Z ratio Total DC res ref pry
ohms		 Max level at 50 Hz
 Package size/style/core
9820 API 312 Mic Pre and Line amp Input 1:4.37 150/600:11.5k 149 0 dBu "e" Mumetal, Mumetal can
9825 Output 1+1+1+1 75:300+75 31.5 +30 dBu "j" M6
9775 Langevin
AM 16		 Input 1Ct+1CT:4+4 50,150,600/
2k5 + 2K5		   +17 dBu "f" Mumetal
Mumetal can
9765 Output 1+1+1+1:1+1  600/150,600    +37 dBu "j" M6
Mumetal can
9375 Telefunken V72 etc Plate choke 750H approx at 1kHz with no dc 
DCR  14.6 kohm 		 "Aj" Gapped M6
1004 Telfunken V76 Input 0.5 + 0.5:30 200/180k 9
ohms		 +12
dBu		 "j" Mumetal
Fits orig. can
9129 Telfunken V74 Output 8:1+1+0.7 2K/30ohms 584 ohms +20 dBu "j" M6 U-Clamp
9186 Altec 1566a Microphone Preamp.  Circuit on request Mains ww primary.  110 V 30 mA, 22V CT 0.5 A "SD" M6 Shrouded
4935 Mic input  1CT:7 200CT/100k 40 ohms +12 dBu "e" Mumetal, Mumetal can
8940 Output 3:1 5k/600 15 ohms (sec) +28 dBu "k" 70% Mumetal Open frame
3575 Altec 436C Compressor
 Bridging input 1:1CT 10K/10K 1.8K +26 dBu "e" Mumetal, Mumetal can
9745 Line Output 10CT:1+1 15K/150+150 77 ohms (sec) +28 dBu "k" M6
U-Clamp
9795 Mains  ww Primary "SE" M6
Shrouded
8540 Gates M5167 compressor. (PP 6V6's) Circuit  Line input  1:4 600/10kCT 120 +16 dBu "e" Mumetal, Mumetal can
9185 Line output 7.3:1 8kCT/150 40 ref sec +40 dBu "SJ" M6 Shrouded
9062 CCA Electronics Corp LA-1D

Circuit

 Line Input 1CT:4+4 600/50K CT "j" Mumetal, Mumetal can
9890 Line Output 5.77CT:1 20K/150+150 "SD" M6 Shrouded
9084 Ampex 351 Line out 5.55CT:
1CT+1		 15K/"600"
+NFB		 1500 +38 dBu "SA" M6
Shrouded
9735 Ampex 350/351 Input 1+1:32 50+50/50K 28 +12 dBu "fF"  Mumetal,
Mumetal can
9643 Fairchild type 670 Control amp output 4:1
9:1NFB		 10kCt/600
+NFB		 950 75 V rms
output		 "SI" M6 Shrouded
Fits into original can.
8344 Signal amp output 9+9: 1+1 60k/600 940 +30 dBu
output		 "jx" M6 Mumetal can
8345 Control amp input 17+17:
1+1		 600/170k 34 +16 dBu "j" Mumetal, Mumetal can
8346 Signal amp input 9+9:
1+1		 600/50k 65 +24 dBu "k" Mumetal, Mumetal can
9527 Pulteq
EQP-1A		 Mains transformer for 1 or 2 units.  WW Primary. Electrostatic screen
250-0-250 at 60 mA. 6.3 V CT@ 1.5 A. 
6.3-5-0 V @ 1.0 A for rectifier and pilot light.  50/60 Hz
Larger than original but still fits on chassis with minio modification.		 "SJ" M6

Shrouded
3603 EQ input
(Triad HS-56)		 1CT:1 600/600 150 +17 dBu "e" Mumetal, Mumetal can
9330 Amp input
(Triad HS-29)		 1:2CT 2k5/10k
 112 +16 dBu "e" Mumetal, Mumetal can
9530 Amp output
Peerless S-217-D		 10CT:1+1
NFB 4% of primary		 15k/600 
15K/150		 39
ref secy		 +23 dBu "j" open 50%
Mumetal
9325 Passive EQ inductor 150/82/68/47/33/27 mH
15/11/10/8/6/5 ohms		 Ferrite

"e"  Mumetal can
0295 Teletronix
LA-2A Compressor

 

More info

 Mains Transformer WW primary 2 x 120,110  V. Electrostatic shield. 250-0-250 V  40 mA. 6.3V CT at 2 A.  "SF"
M6 Shrouded
0208 Mains Transformer 240, 220, 200, 0, -10 Primary. Electrostatic shield. 250-0-250 V  40 mA. 6.3V CT at 2 A.  "SF"
M6 Shrouded
1009 Amp input
1968 original version 
UTC A10 replacement		 1:9.1 600/50k 42 +15 dbu "f" Mumetal 
Mumetal can
4383 Amp input 1:4CT 600/10k
47k load ok		 112 +16 dBu "e" Mumetal, Mumetal can
1010 Amp output
1968 original version 
UTC A24 replacement		 5:1 15k0/600 30 ref secy +30
dBu
output		 "k" open
50% Mumetal
8940 Amp output 3:1 5k0/600 17 ref secy +17 dBu
output		 "k" open
50% Mumetal

8751		 Darlington  Line Amplifier 600 ohm line Output transformer
 1:1.5 N/A 39 +30 dBu "OB" open
U-Clamp M6
Original version P/N L01166
9160 1:1.5 N/A 37 +27 dBu "OA" open
U-Clamp M6, P/N L01166 reduced size
9780 1:1.5 N/A 39 +30 dBu "OB" open
U-Clamp M6
Ungapped for use with pin "F" only. P/N L02567/T1801
9145 Input transformer
P/N 10468		 1+1:2+2 300/1k2 to 1k2/4k8 190 +18 dBu "e" Mumetal,
Mumetal can, Normal laminations.
9165 Input transformer
P/N 31267		 2+2:1+1 10k/2k4 
to 2k4/600		 1k8 +24 dBu "e" Mumetal,
Mumetal can
7490 Helios etc Input transformer
Lustraphone M10 		 1:10 tap for 1:1 200/20K  _9 dBu "eE" Mumetal,
Mumetal can
Threaded boss
7456 Trident A range, B range, etc Input transformer
Marinair ZUTT012a		 1:5.9 600/30K 179 +20 dBu "jE" Mumetal
Mumetal can
9930 Gyraf Passive EQ 267 mH inductor tapped at 269,169,69,22 mH Replaces separate 100,100,47.22 mH inductors shown on schematic "e" Ferrite
Mumetal can
9540 Input 1:1 200/200 ohms +10 dBu "e" Mumetal,
Mumetal can
8403 Output 1:1+1 600:150+150 65 ohms +34 dBu "j" M6
Options
9835 RCA BA-6A
Limiting amplifier		 Input  1CT:4.08CT 600/150 
to 10k		 131 +16 dBu "Ii" Mumetal,
Mumetal can
9830 Interstage 1CT:1 10KCT/10K 1680 +36
dBu		 "Jk" Radiometal
Mumetal can
9770 Output for 6V6 PP
 3.65 CT:1 8k/600 506 +30
dBu
output		 "SK" Fully Shrouded
M6
1100 Ferrograph tape head input transformer For series 3 etc 6:1 300/10k     "e" Mumetal,
Mumetal can