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A unique Pro-Ject Phono Box MM/MC phonostage fitted into a new case with an over engineered power supply.
The original Phono Box shipped with a 16V AC mains adapter. Inside the box, this was half-wave rectified with just one diode for each rail. The half-wave rectified voltage supplied a reservoir capacitor which then supplied a 15V regulator with some filter capacitors. A very primitive power supply indeed and part of the reason these units are so cheap.
I have upgraded the power supply by a significant margin using off the shelf parts and installed everything in an old steel case with a sturdy switch and an IEC socket.
A 12VAC twin output transformer rated at about 60 watts feeds a high quality rectifier and dual rail voltage regulator. The output rails have been set to +/- 15V. The original power supply components on the Phono Box have been removed and the new supply lines soldered to the board.
The case has been made safe with a soldered ground connection. The large cut-outs originally intended for a heatsink have been blocked off with a piece of hardboard. Whilst there are still some holes in the case, you cannot reach any live parts with a finger.
It looks ugly, but it sounds much better than the original with tighter bass and a faster overall response.
Supplied with the original Phono Box case and an earth cable with a croc-clip on one end and a 4mm plug on the other to mate with the ground socket on the chassis.
A phono stage for enthusiasts.
Here are the videos showing the Project in action. I have used Shure SC35C MM, Ortofon 2M Red MM and Denon DL-102 HOMC to test out the Project.
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Click here to buy, and to see similar items on eBay
Category: Sound and Vision:Home Audio and HiFi Separates:Amplifiers and Pre-Amps
Location: norwich