Does anyone know much about AGI preamps?

I have had an AGI 511 pre-amp for some time and I love its supreme build quality and transparent nature. I just can't find any info on the darned thing. I know the company went out of business in the 80's, but there is not a shred of evidence of their existence on the web. I can't find any specs on the thing. I have only seen two others go for sale ever; they seem pretty rare. If anyone knows where I can get some info, or knows anything about the preamp, it would be appreciated. Thanks.

Showing 4 responses by geojap

Well, just the basic facts, I think. I have seen one or two web pages where people mentioned modifications to it. What would the improvements be, exactly? I was mainly wondering what the basic specs were. Like S/N ratio (it almost seems to me to be passive, so would this even apply?), the stereo channel separation (dB), distortion (%), and also the relative quality of the pots/wiring/electrical components. I know nothing about this unit and it intrigues me because it sounds so good and appears to be built so well. It would be cool to know what flavors of equipment with which it performs best. I have it hooked up to a Myryad CD player and a McIntosh MC-2205 and it sounds preeeetty good. Thanks very much, Jason.
Wow, I bought this unit on a strong recommendation for $220, and now after reading your descriptions I feel like I've gotten away scott-free with the Great Train Robbery. Now I know the explanation for the sound that I hear from it. My hat goes off to Dave. Good job.

These are the web sites that I found that only briefly mention the AGI 511a and modification, but there is no detailed explanation to it.

Thanks for the tips about the modifications. I know a local electronics wizard here in Austin that I will ask to look into these changes. As you mentioned interconnects, I am using some extremely dull-sounding Acoustic research cables and have been researching replacements. I initially considered Nordost Blue Heavens, but then I found a DIY recipe on the web for teflon-coated silver wire interconnects, and I'm going to give them a shot first. The URL is below. Check it out. It's a much more coherent plan than most others I've seen on the internet.

Thanks very much, guys. Happy Listening to you.
Sean, yes, I have used two of my TT's with the AGI so far. A Technics SL-D2 and a Pioneer PL series (either a 550, 560, or 570, I can't exactly remember which I've got back there rtight now). I do very much like the way vinyl sounds on it, but I have spent more time putting together a DIY record vacuum than listening to vinyl lately. After I've cleaned a few records I'll give it a critical listen. Are there some better TT's you could recommend? I love auditioning and looking at new stuff. I've considered looking into the Thorens TD-124. Someone here in Austin who owns a hi-fi shop talks about them like they have all been touched by King Midas. Thanks very much, Jason.
Sure, I'm game to to try looking at the phono stage. If you'd like to email me, it's