Hi,

It was a project published in the 90's in Construire HiFi by Ciro Marzio and Christiano Gelasi. The original used a simple single valve stage with a good quality output transformer...

The current design derived from that but heavily modified by members of the LLDHC uses parallel feed output transformers (S&B TX-101 silver) and a transfomer volume control (S&B TX-102 silver) with battery biasing for the grid and Mundorf Silver parallel feed coupling capacitors.

Valve these days is the russian 6S45 but WE417a, 437a and others can be used.

Anode load choke - you have a number of options, PSU Valve rectified, choke input with extra LC filter section and no electrolytic capacitors.

Gain is around 20db, output impedance around 150 Ohm, distortion is pretty low for non nfb circuitry, single valve stage, 2 silver wound transformers & 2 silver foil capacitors is all there is for the signal circuit and all she wrote.

For myself I keep things much abriged and I stick to a Music First Audio passive, Euridice's come into their own in multiamped, multiway systems using passive line level LC Crossovers and Equalisation.

Ciao T