Saturday, March 10, 2007

Quad 405-2 State of the Art


After several weeks of work I presented my latest revised Quad 405-2 on Ebay today.


The dual-mono power supply by Dada/JPE gives a dramatical improvement of channel-separation and stability (see the other article about the dual power supply below).


Of course it has OPA 604's on board and the internal cabling is High-end. In used 4x MJ15003 power-transistors in this one.
Click on the pictures for High-res.
I love soldering but I hate taking digital pictures.

Stefaan

4 Comments:

Anonymous Anonymous said...

Why did you use MJ15003 power-transistors instead of the zn3773 you use in your upgrade?

11:52 PM  
Blogger Stefaan said...

Hi,

Both transistors will do a very good job in the 405.

The 2N3773 is somewhat faster and the MJ15003 has somewhat more power.

Stefaan

10:04 AM  
Anonymous Anonymous said...

You might want to concider moving R30/31 to the other side of the PCB as this removes the heat source from C10

Stuart

3:34 PM  
Anonymous Anonymous said...

You might want to relocate R30/31 to the other side of the PCB as this removes the heat source from C30

Stuart

3:36 PM  

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