DH200 modifications

 


The power supply caps upgrade (Cornell Dubilier) from 2 x 10000 uf to 4 X 14000uf per polarity including a lower impedance ground plate is show below:

Top view of amp:

 

Below is the (low cost) "low memory" input stage pcb built using a generic "Radio Shack (TD)" pcb:

(refer to   Design Details of Power Amp for topology of "Input stage")

 Below is 2 low cost VAS "low memory" cascode pcb built using a generic "Radio Shack (TD)" pcb:

(refer to   Design Details of Power Amp for topology of "VAS stage")

Below is the DH-200 driver pcb with integrated "low memory" input and VAS stages pcb. Note that it is a prototype so some damage was done to the pcb during several different kinds of modifications prior to this one:

 And the regulated power supply for the front end: