Hello
The amp section of HD250 integrate amp are same than the ZD100, here is the HD250 schematic.
http://www.audio-circuit.dk/Schematics/radford HD250-ZD22.pdf
Bye
Gaetan
The amp section of HD250 integrate amp are same than the ZD100, here is the HD250 schematic.
http://www.audio-circuit.dk/Schematics/radford HD250-ZD22.pdf
Bye
Gaetan
Hello
Here is a link to a simplified schematic of the Radford ZD amp
It is quite different than my HD250 amp.
http://d.yimg.com/kq/groups/7875825/or/208386291/name/ZD+instructions0006.JPG
Bye
Gaetan
Here is a link to a simplified schematic of the Radford ZD amp
It is quite different than my HD250 amp.
http://d.yimg.com/kq/groups/7875825/or/208386291/name/ZD+instructions0006.JPG
Bye
Gaetan
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
An externally hosted image should be here but it was not working when we last tested it.
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