Passive Preamps? Anyone?

Incidently, toward the end of the above Lightspeed thread, Nelson Pass contributes schematics for a buffered passive that employs optocoupler resistors. I don't know whether he is currently selling product based on this design. My read is that sonics of the AU$500 Lightspeed passive should equal or surpass the optical volume control in the $23K DartZeel NHB-18S.

I believe Nelson Pass already posted the schematic on the Pass DIY site as well. I saw a couple built by Audiogon member Rawsonte fly out of here of late.

As Pubul57 says the rsistor based design is much simpler. I'm tempted to break out my EVS nude attenuators and give them a test run in my new set-up. I looked at the Lightspeed thread and am curious about those attenuators as well. Anyone know a way to contact the manufacturer?

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.