Passive Preamps? Anyone?

He keeps a low profile; emailing him through that forum is probably the best way.

One more I forgot to mention is from ElectraPrint marketed by their Electra-Fidelity subsidiary. Three versions (at least) all very reasonably priced.

Jack Elliano, ElectraPrints guiding light is considered to be one of the industries gurus when it comes to building audio output transformers, chokes, and power transformers.

After reading 63 pages on the DIY Audio forum and speaking to George I decided to pull the trigger on the Lightspeed. Also, I figure if Nelson Pass got into the mix on LDRs it is worth checking out.

Dave, did you ever get them implemented in the active preamp. I can't remember if you posted the outcome on DIY Audio.

Clio, I acquired the LDR piece parts, but abandoned the project due to problems getting LDRs to track closely in a high-impedance volume control for a balanced tube preamp. I've been waiting on Unixman from that thread to complete a rather complex digital control system that would resolve this issue. But assuming you need a single-ended passive of around 10K impedance, the Lightspeed should do fine. Looking forward to your findings.

Actually I would have preferred balanced, but the cost was prohibitive due to the added parts and work involved. George wasn't excited about tackling the project either. I was able to get him to build me one with dual volume controls so I could have a balance option.

My DAC has an output impedance of 50 ohms and my amps an input impedance of 100k ohms. The Lightspeed should be fine I imagine.