Active or passive preamps?

I found that while a passive preamp did indeed provide the last n'th degree of detail, it did sometimes sound a little anemic with some source components. It sounded great with my tube phono stage, good with my cd player, and anemic with my tuner and tape deck.

If you just have one or two higher end source components that can drive a passive, go passive, otherwise an active is a more general solution. I noticed my new (used!) $4000 pass labs active-only preamp actually outperformed my old $1250 adcom while running in passive mode. Barely though! And that was while running with pass amps too! I don't think all passives are created equal - some have higher quality parts which affects the signal.

Check out the adcom gfp-750 - it has both active and passive modes. I think it's the best buy out there in used audio. Being able to just flip a front panel switch to go active/passive was a great feature. Plus you can resell it pretty easily.

John_1 is certainly right that not all passives are equal. Not only parts quality but the choice of attenuator matters. Most agree that stepped attenuators based on rotary switches are superior to potentiometers--though makers and users of very expensive pots will disagree. But assuming stepped is best, it can be series, shunt or ladder configuration. I see no excuse except money-saving for series, though some very prestigious active preamps--the CAT's, for example--use them. The switch matters too. Elma is good, but Shallco is impossible to beat in my experience. A DIY passive can compete with the best commercial ones available, and if you don't use more than two sources, it can be quite simple. But as others have said, your sources have to be up to driving a passive. However, if they aren't, why not aim for ones that are? The money you save not buying an active preamp should make this a practical option.

What's a source for diy passive preamps??

If you like analytical, detailed sound then use a passive pre-amp - or - like Wadia suggests, no pre at all! However, if you want "musiclaity" in your system, with a better level of dynamics, you need an active pre-amp that buffers the input and amplifies and attenuates the signal properly.

One source for DIY passive preamps is www.goldpt.com. Arne Roatcap has designed Elma switches with circuit boards, in various configurations, and has at least one schematic for a passive. He's a helpful source of advice too. If you want info from me on what I've built, email nicetom@sonic.net. I used Elma switches once, Shallco several times, from either The Parts Connection or directly from Shallco.