E A Sowter Ltd PRO VINTAGE TRANSFORMERS

9970 Microphone input REDD47 etc
Recording quality microphone transformer designed for this excellent amplifier originally used by the Beetles at Abbey Road. Ratio 1:7 with 35% secondary tap. Very large 100% Mumetal core and thick Mumetal can. Colour coded leads. Primary inductance 15H approx -0.5 dB at 8 Hz with 200 ohm microphone. Can size 45 mm dia 52.5 mm high mounting grommet or 2 x M3 holes.
Schematic
Price: £66.68

Package style

9980 Output transformer for REDD47 etc
Recording quality output transformer designed for this excellent amplifier originally used by the Beetles at Abbey Road. The design is based on the original but with our our enhancements. Ratio 7:1+1. 10K/200+200 ohms. Normally used with secondary windings in parallel to give a +18 dBu at 20 Hz but may be series connected for +26 dBu at 20 Hz with secondary windings in series. Very large 40% Mumetal 50% M6 core for high output level, ultra low distortion and exceptional dynamic range. and thick Mumetal can. Colour coded leads. Bandwidth 10 Hz to 50 kH. Can size 45 mm dia x 52.5 mm high mounting grommet or 2 x M3 holes.
Schematic
Price: £66.68

Package style

9775 Langevin AM16 Input Transformer
High performance configurable transformer for repair or reconstuction of the Langevin AM15 microphone/line amplifier. Input 50/150/600 ohms. Output two 2.5K windings. Full geometric balance. Mumetal can 34 mm dia x 37.5 high. Colour coded leads. max input level +17 dBu at 50 Hz
Information
Price: £56.55

9765 Langevin AM16 Output Transformer
High performance configurable transformer for repair or reconstuction of the Langevin AM15 microphone/line amplifier. Incorporates 4 tightly coupled primary windings for this push-pull split load transistor circuit. Output configurable for 150/600 ohms. Max output level +35 dBu at 50 Hz. Mumetal can 45 mm dia x 52.5 mm high. Colour coded lads.
Information
Price: £56.55

9186 Altec 1566b Mic Pre Mains
Fully shrouded with colour coded leads. WW Primary 120,110 V Twin winding. 110V at 30 mA, 22 V CT 0.5 A.
Generously designed mains transformer with low loss M6 core for this easy to make high performance microphone amplifier. See also input type 4935 and output type 8940. Circuits available.

Price: £85.25

9745 Altec 436C Line output
15kCT/150+150 ohm output transformer for driving a balanced line from push-pull 6CG7 etc. 100% M6 core for high level capability and low distortion. Twin secondaries for 600/150 ohm outputs. Voltage ratio 10CT:1+1 Max dc per side of primary 30 mA. Colour coded leads. Size A Supplied with end frames for vertical or horizontal mounting.
Price: £52.44

9795 Altec 436C Compressor Mains Transformer
Fully shrouded with colour coded leads. WW Primary 120,110 V Twin winding. 117V at 100 mA, 6.3 V CT 1.8 A. Electrostatic shield for power line noise supression.
Generously designed mains transformer with low loss M6 core for this easy to make high performance compressor. See also type 3575 bridging input and output type 9745. Circuits available. Size "E" Fully shrouded.

Price: £88.25

9375 Telefunken plate choke for V72 etc
750H approx with no dc applied. DC resistance 14.6 k ohms.
Dimensions 37.5 x 35 x 45.5 mm. Suitable for very low anode current circuits (~1 mA) Termination options (solder tags illustrated) Wound using 2 chamber bobbin for high self resonance frequency. Size j. Termination options (solder tags illustrated)
Links
Price: £50.67

Package style

9129 Telefunken V74 Output
Ratio 8:1+1+.7 Max output level +20 dBu. 3 separate secondary windings. 100% M6 core. Original chassis may require holes drilling to fit. Termination options (solder tags illustrated) Size j
Price: £40.31

Package style

1004 Telefunken V76 Input
High performance high ratio 200 Ohm Mic input transformer. Ratio 0.5+0.5:30 100% Mumetal core. 6 winding sections with 4 internal electrostatic screens. Size j No clamp. Colour coded leads. Fits original can. Can be supplied with a 45 mm dia round can if required.
Info
Price: £54.45

9084 Ampex 351 Line Output. 15K/600 +NFB
Ratio 5.55CT:1CT:1. Separate winding for negative feedback. Total dc resistance referred to primary 1500 ohms. Max imput level +38 dBu. Fully shrouded package size SA. Colour coded leads.
Circuit
Price: £52.45

9735 Ampex 350/351 Input 200/50k ohms
Ratio 1+1:32. Input can be configured for 50 or 200 ohms. Max input level +12 dBu at 50 Hz. 100% Mumetal core and can. Colour coded leads.
Price: £52.18

Package style

9915 Ampex 350 Line Output 15K/600
Line output for Ampex 350. Single ended output for 6F6 tube. Output can be strapped for 150 or 600 ohms. Fully shrouded size "D" with colour coded leads. Circuit available on request. Weight 1.0 Kg.
Price: £65.99

9185 GATES M5167 Line Output
Line output for Gates STA-LEVEL Compressor M5167. Fully shrouded size "J" with colour coded leads. 8000 ohms CT to 150 ohms. A high power transformer giving plenty of level and a low output impedance. Circuit available on request. Weight 2.1 Kg.
Price: £63.61

9880 GATES M5167 STA-LEVEL Compressor Mains Transformer
Fully shrouded with colour coded leads. WW Primary 120,110 V Twin winding. 250-0-250V at 100 mA, 6.3 V CT 2.5 A. 5V@2A. .Electrostatic shield for power line noise supression.
Generously designed mains transformer with low loss M6 core for this easy to make high performance compressor. Circuits available. Size "L" Fully shrouded. See also type 9185 output and type 8540 input transformers.

Price: £120.82

9890 CCA LA-1D Compressor Line Output
Line output for CCA Electronics Corporation Compressor LA-1D. Fully shrouded size "D" with colour coded leads. Push-Pull 20,000 ohms CT to 150 +150 ohms. Full geometric balance. Replacement for Chicago B02. Circuit available on request. Weight 1.0 Kg.
Price: £72.59

7490 Lustraphone M10 Input Transformer 1:10 with a 1:1 tap
Ratio 1:10 with tap for 1:1 Max input level +9dBu. Sowter designed transformer replacement for the original Lustraphone transformer. Internal electrostatic shield to ensure good comon mode noise rejection. Mumetal can 34 mm diameter with colour coded leads and threaded mounting boss.
Price: £40.40

9527 Pulteq EQP1 Mic Pre Mains
Fully shrouded with colour coded leads.Size "J". WW Primary 120,110 V Twin winding. 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. Generously designed mains transformer with low loss M6 core will power 1 or 2 channels. 50/60 Hz
Larger than original but still fits on chassis with minor modification
Price: £111.38

9330 Pulteq EQP-1A 2k5/10KCT Amp input
Ratio 1:2 CT. Max input level +20 dBu. Sowter designed transformer similar to Triad HS-29. Internal electrostatic shield to ensure good comon mode rejection for accurate phase splitting at high frequencies. Mumetal can with colour coded leads.
Price: £36.64

9530 Pulteq EQP-1A 15K/600 PP Line op.
Ratio 10CT:1+1 4% NFB. Max output level +23 dBu. Total dc resistance 38 ohms ref secondary. Can be configured for 600 or 150 ohm secondary. 50% Mumetal core for exceptional bandwidth. Termination options (solder tags illustrated) Size j OCC wire option
Data sheet
Price: £40.31

OCC WIRE (£12.05 price increase)

Package style

8940 Teletronix LA-2A DIY. 5K/600 Line op.
Ratio 3:1. 5k/600 ohms output transformer for driving balanced line from ac coupled cathode follower or SRPP circuit. Total dc resistance ref secondary 17 ohms. Colour coded leads. Size A. Max output level +17 dBu. 50% Mumetal core for exceptional bandwidth and dynamic range.
Circuit
Price: £58.40

Click for PCB pins (£2.48)

1010 15K/600 LA-2A 1968 15K/600 Line op.
Ratio 5:1. 15k/600 ohms output transformer for driving balanced line from ac coupled cathode follower or SRPP circuit. Total dc resistance ref secondary 30 ohms. Colour coded leads. Size A. Max output level +30 dBu. 50% Mumetal core for exceptional bandwidth and dynamic range. Similar to UTC A24 but with improved bandwidth.
Data sheet
Price: £58.40

Click for PCB pins (£2.48)

1009 Teletronix LA-2A 1968 Input transformer
600 ohm to 50K input transformer ratio 1:9.1 Bandwidth -1.6 dB 20Hz to 20 kHz. Similar to UTC A10. Mumetal can with colour coded leads or PCB pins
Data sheet
Price: £43.03

Click for PCB pins (£2.48)

0208 Teletronix LA-2A Mains EU Primary.
Power transformer for Teletronix LA-2A Compressor.
240, 220, 200, 0, -10 Primary. 250-0-250 at 40 mA. 6.3V CT at 2 A. Internal electrostatic shield for reduction of noise caused by power line transients. Fully shrouded package. Size "F".
Circuit
Price: £96.04

0295 Teletronix LA-2A Mains WW Primary.
Power transformer for Teletronix LA-2A Compressor.
2 x 120,110 V Primary. 250-0-250 at 40 mA. 6.3V CT at 2 A. Internal electrostatic shield for reduction of noise caused by power line transients. Fully shrouded package. Size "F".
Circuit
Price: £96.04

8751 Neve/Darlington Line Output
Ratio 1:1.5. Sowter replacement design for Neve P/N L01166. Optimised for voltage drive circuit. Max output level +30 dBu. Total dc resistance ref secondary 39 ohms. Size "OB" (Width 46 mm)
Price: £39.89

Package style

9160 Neve/Darlington Line Output
Ratio 1:1.5. Sowter replacement design for Neve P/N L01166. Optimised for voltage drive circuit. Max output level +27 dBu. Total dc resistance ref secondary 37 ohms. This is identical to type 8751 except we have used a 0.75 inch core instead if 1.0 inch. Ideal for rack mounting. Size "OA" ( Width 40 mm.)
Price: £39.89

Package style

9780 Neve Line Output
Ratio 1:1.5. Sowter replacement design for Neve P/N L02567/Marinair T1801. Ungapped version of P/N L01166 for Neve 183AM card which provides two separate outputs. Must be connected to pin "F" and used in conjunction with Sowter 8751. Max output level +30 dBu. Total dc resistance ref secondary 39 ohms. Size "OB" (Width 46 mm)
Price: £39.89

Package style

9145 Configurable Neve Mic/Line Input
300/1k2 to 1k2/4k8. Ratio 1+1:2+2 Sowter replacement design for Neve P/N 10468. Twin primary and secondary windings for various input configurations. Internal electrostatic shield and Mumetal can with colour coded leads.
Data sheet
Price: £38.84

9165 Neve Line Input
10k/2k4 to 2k4/600. Ratio 2+2:1+1. Sowter replacement design for Neve P/N 31267. Twin primary and secondary windings for various input configurations. Internal electrostatic shield and Mumetal can with colour coded leads.
Price: £38.84

9643 Fairchild Control amp output
Sowter replacement design for Fairchild 670. 10kct/600ohms Ratio 4:1 Feedback winding ratio 9.5:1 . Fully balanced M6 cored transformer using two chamber bobbin. Fully shrouded style S. Size I.
More info
Price: £102.96

8344 Fairchild Signal amp output
Sowter replacement design for Fairchild 670. 60kct/600ohms Ratio 9+9:1+1. M6 core in Mumetal can with colour coded leads. Size j
More info
Price: £62.89

8345 Fairchild Control amp input
Sowter replacement design for Fairchild 670. 600 ohms/170k ohms. Ratio 17+17:1+1. Mumetal core
core in Mumetal can with colour coded leads. Size j.
More info
Price: £65.12

8346 Fairchild Signal amp input
Sowter replacement design for Fairchild 670. 600 ohms/50k ohms. Ratio 1+1:9+9. Fully balanced two chamber bobbin and Mumetal core. Mumetal can with colour coded leads.
More info
Price: £111.88

9770 RCA BA-6A Output Transformer
Replacement output transformer for RCA BA-6A limiting amplifier. Push-Pull 6V6 8000 ohms to 600 ohms. Full geometric balancing. 10 sparate winding sections for excellent bandwidth and transient response. Size "K" fully shrouded construction. Colour coded leads.
More information
Price: £106.13

9830 RCA BA-6A Compressor Interstage
High performance configurable transformer for repair or reconstuction of the RCA BA-6A Compressor. Radiometal (50% Nickel) transformer in Mumetal can. Will fit into original 78 x 100 mm can. Impedance ratio 10k CTK/10k.. Max level +3 dBu. Colour coded leads.
More information
Price: £104.89

9835 RCA BA-6A Input Transformer
High performance configurable transformer for repair or reconstuction of the RCA BA-6A Compressor. Ratio 600/150 CT: 10K. Max input level (600 ohm configuration) +16 dBu. Colour coded leads.
More information
Price: £65.12

9935 API 525 Replacement for AP 2623
Ratio 1:1:1 For output and control amplifier. Max input level +26 dBu at 50 Hz. High performance Sowter transformer for API 525 compressor. Replacement for AP 2623-1,2,3,or 4 M6 core with colour coded leads. Mounts with two holes in side of core. Plan view: 43 x 36 mm. 24 mm above and 8 mm below PCB
Circuit
Price: £35.75

9820 API 312 Input type AP2622
Replacement for AP2622 . Primary has 2 equal 150 ohm windings which can be used in series or parallel for 600/150 ohms input. ratio 1:4.4 or 1:8.8. 100% mumetal core and can. Colour coded leads or optional PCB pins.
Information
Price: £39.20

Click for PCB pins (£2.48)

9825 API 312 Output type AP2503
Replacement for API 2503-1/2. 4 identical 75ohm windings quadrifilar wound. A multipurpose transformer with an incredible HF response. +30 dBu output at 30 Hz configured as 1:2
Information
Price: £35.75

Package style

9905 AM 864/U Mains Transformer
Fully shrouded with colour coded leads. WW Primary 120,110 V Twin winding 50/60 Hz. 175-0-175 at 40 mA, 6.3 at 2 A 5V at 2 A. Internal electrostatic shield for supply line noise isolation. Generously designed mains transformer with low loss M6 core for this easy to make compressor amplifier. See also input type 8540 , output type 9900 and choke type CB24. Schematic available. Size "I"

Price: £118.90

7456 600/30k Very high level input. 1:5.9
High level, very high performance line input transformer. Mumetal can with M3 threaded mounting holes and colour coded leads.
Suitable as replacement for original transformer in Trident A range, B range, Fleximix and other vintage recording studio units. Replacement for Marinair ZUTT012a
Data sheet
Price: £42.43