My preamp is a Parasound PHP-850. It's a August 2001 acquisition. Here is its datasheet:
http://www.parasound.com/vintage/php850.phpI paid around $350 for it.
The Parasound preamp is a John Curl design. It does have tone controls but it also has a tone control defeat switch that I usually use.
The dealer allowed me to audition it along with 2 of the Parasound amps. He didn't know I was borrowing a 4B to audition as well.
I was replacing a Yamaha Integrated amp that was dying.
The Parasound Preamp with either of the Parasound amps (HC-1000A or HC-1500A) was an improvement over the Yamaha. I just didn't care for the sound. It was veiled and unnatural.
The Parasound Preamp with the Bryston power amp was on an entirely different level. Music was alive and had presence and power! It was an amazing difference.
At that point, the price difference between the Parasound amps and the Bryston was irrelevant. I was getting a Bryston.
It took me about a month to get up to the Nashville area to find a Bryston.
My preamp gets the job done, but one of these days, I want to pickup a BP-20 on the used market.
HsvHeelFan