Radford ZD 50 and ZD 100 schematic anyone ?

Hello

I also found this ZD50 output section schematic.

Bye

Gaetan
 

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homemodder said:
I bet these amps sound pretty good, gaetan8888 ???


Hello

I have the HD250 integrated amp, it sound very good, but the amp section topology was less good than the ZD50 and ZD100 but the HD250 preamp section are same than the ZD22.

The ZD50 and ZD100 ad a novel type of VAS and bias. The VAS section was isolated from the output by the Penultimate bias section.

As you can see in this simplified schematic.

Anyone seen this type of bias circuit before (the Penultimate bias) ?

I may seen that before but I don't remember where.

Bye

Gaetan

[IMGDEAD]http://d.yimg.com/kq/groups/7875825/or/208386291/name/ZD+instructions0006.JPG[/IMGDEAD]