SOWTER AUDIO TRANSFORMERS
CLASSIC AMPLIFIER TRANSFORMERS

You can expect these transformers to sound the same or better than the original.

Dimensions may not match the original. Please request preferred package style when ordering. We are continually adding to this list. Please submit a custom design request if the transformer you are looking for is not here. Please ask support if you have any questions.

Quote TYPE AMPLIFIER SPECIFICATION SIZE
Buy 1060 MARSHALL DSL50 JCM2000

OUTPUT 6000 to 4/8/16 Ohms. 50W at 50 Hz 150 mA. Improved bass, bandwidth and harmonic reponse. Fits chassis with minor modification.

K
Buy 9079 DYNACO Stereo ST70 MAINS 360-0-50-360 V at 300 mA
6.3 V CT@ 4.5 A, 6.3 V CT@ 4.5 A, 5V @ 3A. 120+120 V primary. Style "T"
P
Buy UA21 OUTPUT 6600 43% taps to 16/8/4 ohms Style "T" or "S" on request. N
Buy 8966 QUAD II MAINS WW primary (100-120V) to 310-0-310 V @ 200 mA, 5 V @ 2A, 6.3 V CT @ 6A. Electrostatic screen. Fits on chassis but not in the original can. You may need to make an adapter plate. N
Buy 8967 MAINS EU primary (200-250V) to 310-0-310 V @ 200 mA, 5 V @ 2 A, 6.3 V CT @ 6A. Electrostatic screen. Fits on chassis but not in the original can. You may need to make an adapter plate. N
Buy 9842 CHOKE 20H at 20 mA.  DCR 500 ohms approx. Open frame. A
Buy 9156 RADFORD
Tech info on request
to support
OUTPUT T2063 (STA15 series 2) 
8K ohms 43 % taps to 16/8/3 ohms. 15 W at 20 Hz
N
Buy 9342 OUTPUT T2142 (STA15 series 3)
7.5K ohms 43 % taps to 16/8/4 ohms. 25 W at 20 Hz
N
Buy 9195 OUTPUT T2075 (STA25 series 3&4)
5K ohms 43 % taps to 16/8/4 ohms. 25 W at 20 Hz
N
Buy 9196 CHOKE T2165 (STA25) 3 H 250 mA 18 ohms N
Buy 9158 CHOKE T2072 (STA15) 10H 250 mA 67 ohms Open frame J
Buy 9157 MAINS T2064 (STA15)
0 10 210 230 250 V to 350-0-350 250 mA, 6.3 V CT @ 4 A, 6.3 V CT @ 4 A, 5 V  @ 2 A Fully shrouded
P
Buy 9194 MAINS T2093 (STA25)
2 x 110 120V to 350 V @ 400 mA,  120V @ 50 mA,  6.3 V CT @ 4 A,  6.3 V CT @ 4 A,  6.3 V @ 2 A  Fully shrouded
P
Buy 8994 ACROSOUND TO350 OUTPUT 6600 to 16/8/4 ohms. 100 W. Separate 43% UL winding P
Buy 1430 MULLARD 5-10 OUTPUT 8000 to 4/8/16 Ohms. 43% UL taps. 10W at 20Hz. 50mA dc. J
Buy UA21 MULLARD 20WLEAK STEREO 20 OUTPUT 6600 Ohms. 40W at 20 Hz N
Buy UA23 LEAK TL12 TL25 OUTPUT 8000 Ohms 30W at 15 Hz N
Buy 8950

Williamson Amplifier


Wireless World Reprint
OUTPUT 10K to 16/8/4 ohms. (Our own optimised design) P
Buy 8951 MAINS EU primary. 425-0-424 at 180 mA.
5V at 3A. 6.3V CT at 4A.
N
Buy 8609 CHOKE 30 H 40 mA A
Buy CA15 CHOKE 10 H 200 mA F
Buy U070 GEC 100 W UL Fixed bias
OUTPUT T1 4500 ohms, 100W at 25 Hz P
Buy CA09 Choke L1 5 H at 400 mA J
Buy CB25 Choke L2 20 H at 50 mA A
Buy M071 MAINS T2 650-0-650 at 325 mA, 6.3 V CT at 5 A, 4 V at 7 A, 75 V at 10 mA Q