I'm using the Robert Grodinsky Research RGR-4 as my main preamp. List price $650. I bought mine used on eBay for $200. Sonically competitive with any of today's expensive - and overpriced! - preamps. Mr. Grodinsky was a talented engineer whose main business was the company RG Dynamics for the pro audio market. His first preamp was the RG Dimension 3. That evolved into the RGR-4. I have many preamps - both tube and transistor - in my collection. Yet I choose to use this one!
