The Echoke is a completely built and tested module. The Echoke can replace existing traditional chokes.
Traditional chokes work very well in general, but have a few disadvantages :

• large weight 
• large dimensions 
• magnetic strayfield which can induce hum in surrounding electronic circuit.

The E-choke solves these problems en gives up till 70dB supply ripple reduction at currents up till 400mADC 
Additionally a large reduction of the intermodulation distortion will be reached.

UL40S2, triode, without E-choke	UL40S2, triode, with E-choke

Specifications

• Imax out 400mAdc
• Vmax in 450Vdc (can be adapted to 600Vdc max when changing input capacitor to suitable working voltage)
• ripple 15Vtt (maximum input ripple)
• C-in 330uF/450V (included on module): C-in may be reduced linearly when current consumption is lower than 400mA.
  C-in must be reduced when valve rectification is applied.
  C-out 330uF/450V (externally required, recommended value)

   

• Voltage drop <17Vdc (in-out at 400mAdc load)
• Dissipation <5W
• Heatsink integrated, connected to gnd
• Rejection:
  >40dB, time modus off (mostly used with class AB amplifiers)
  >60dB, time modus on (recommended for class A amplifiers)
• short circuit NOT protected, always include fuse at module output

Downloads:

(Dutch) background article from Menno van der Veen:
NL_Tentlabs / VDV E-choke design (PDF)

(ENGLISH) background article from Menno van der Veen:
UK_Tentlabs / VDV E-choke design (PDF)