What do you think of this preamp design?

No one?

Ralph, I appreciate the offer. I may offend the designer of my single ended amp if I ask him to change his amp in any way (He is pretty legendary and has been building audio equipment since the early 70's). But I'll ask.

Ralph, I saw that opamp in the feedback loop was puzzled because they claim they don't use any chip based opamps in their amps.

BTW, I heard you're working on remote volume control for the MP3. When will it be ready? Did you see my thread on this forum about lack of a remote control being a deal breaker for preamps? More than I thought need remote.

That's great. Now only if you can put some RCA outputs on your MP3, I'll bite.

Ralph, don't you think you are asking a little too much? By doing this mod to a single ended amp, you likely will void the manufacturer's warranty and decrease the resale value of the amp. If someone modded one of your amps because another manufacturer says it will make your amp compatible with their preamp, wouldn't you void your warranty? I would not do this to my single ended amp or your amp for that matter. I would only let Atma-sphere touch my Atma-sphere amp.

Ngjockey, if the Audio-gd preamp sounds like any preamp made by PS Audio, I'll pass. I never liked any of PS Audio amps or preamps that I have heard over the years.

Apparently, the neat little thing about this preamp is you can swap different gain modules that were designed to sound like other classic solid state preamps by Mark Levinson, Accuphase, Music Fidelity, etc. As far as I know, Audio-gd does not have any gain modules that suppose to sound like PS Audio.

The Audio-gd C3 input impedance is 47 kOhms. I asked if it can be changed to 100 kOhms, and they said it was no problem. I wonder why they don't use higher input impedance.

Kirkus, I completely agree with you regarding the price of this unit. I'm not an electronics expert so I can't attest to the soundness of the design, but there is no US or EU based company (even if they manufacture in China) that can make a preamp or amp of this build quality for the price they're asking for. If this was a US based company, I wouldn't be surprised if the preamp was priced at $6000+.