Today this MC-Preamp is far from being state-of-the-art. Nevertheless, I still use it and like to show it here. The preamp has symmetrical inputs and unbalanced outputs that deliver up to 200mV.

The schematics show a differential input with a MAT03 double transistor and its constant current source. Further amplification is provided by two OP27 op-amps. I have combined each amplifier board with its own power supply board. On that board there are the rectifier diodes, snubber and filter caps and a LM325 dual polarity tracking regulator. The two small laminated transformers are located in a separate case to prevent EMI problems.

The casework is bronze anodized aluminum, tinted glass and polished walnut burl wood.

Comments

• Alex Tech
• 19 May 2011 at 04:37PM
• Hi MARTIN, AGAIN, WHAT CAN I SAY. 10/10 WELL DESIGN UNIT. I LOVE IT.

• Stixx
• 10 October 2011 at 12:27PM
• Absolutely beautiful!