SOWTER AUDIO TRANSFORMERS
POWER SUPPLY FILTER AND PLATE CHOKES

Chokes for valve amplifier power supplies

Our chokes are wound on M6 cores with factory adjusted gap. We can make various types of choke as fillows:

  1. Capacitor input filter
  2. Choke input filter.
  3. Plate (Anode) chokes.
  4. Balanced chokes

Chokes for capacitor input filters are the most frequently used but choke input filter chokes provide better regulation of the power supply though are much larger.

To calculate the voltage and current for various power supply configurations please use the formulae on our site.

Plate chokes for use in parallel feed amplifiers are specially designed using a two chamber bobbin and additional insulation to maximize the self resonance frequency.

Bifilar wound balanced chokes and other special chokes can also be supplied.

Our filter chokes are normally supplied in an open frame (Style "O") package.  Fully shrouded (Style "S") is available for a small extra charge. Style "S" is included in the price for plate chokes.

CUSTOM DESIGNED CHOKES Popular designs are listed below but we can make custom designs at no extra charge. To order a custom design please submit your specification using the link: CUSTOM DESIGNED CHOKES. We will send you a firm quotation and a design reference so you can order from our webshop.

For tapped equalizer chokes see EQ Inductors.

CHOKES
(For use as Capacitor input filters only)
CLICK HERE FOR DIMENSIONS
  TYPE L (Henrys) I DC (mA) R (ohms) SIZE WEIGHT (Kg)
Buy CB01 1 200 16 A 0.5
Buy CB02 1 400 12 C 0.7
Buy CA03 1 500 7 E 1.1
Buy CA04 1 800 7 I 1.5
Buy CA05 1 1200 7 L 2.6
Buy CB06 2 100 37 A 0.5
Buy CB07 5 200 53 D 0.9
Buy CA08 5 300 40 F 1.2
Buy CA09 5 400 42 J 1.7
Buy CA10 5 500 36 L 2.6
Buy CA11 5 800 30 N 4.6
Buy CA12 5 1000 22 P 6.4
Buy CB14 10 100 156 B 0.6
Buy CA15 10 200 71 F 1.2
Buy CB16 10 300 55 L 2.6
Buy CB17 10 500 47 N 4.6
Buy CA18 10 550 73 N 4.6
Buy CB19 10 600 33 P 6.4
Buy CA20 10 800 30 Q 9.4
Buy CA22 12 150 101 E 1.1
Buy CB24 18 70 258 C 0.7
Buy CB25 20 50 451 A 0.5
Buy CB26 20 100 169 E 1.1
Buy CA27 20 150 162 F 1.2
Buy CA28 20 200 157 J 1.7
CHOKES
(For use with choke input filters)
  TYPE L (Henrys) I DC (mA) R (ohms) SIZE WEIGHT (Kg)
Buy 8970 10 H 500V 100 190 D 0.9
Buy 8971 10 H 600V 200 151 J 1.7
Buy 8972 10 H 650V 300 89 M 3.4
PLATE CHOKES
Buy 8901 50 H
1000V @ 30 Hz
100 150 N 4.6
Buy 8982 100 H
400V @ 30 Hz
50 310 K 3.3
Buy 8985 50 H
400V @ 30 Hz
40 260 J 1.7
Buy 9080 50 H
400V @ 30 Hz
25 550 F 1.2