Radford ZD 50 and ZD 100 schematic anyone ? - diyAudio
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Old 20th February 2008, 08:34 AM   #1
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Default Radford ZD 50 and ZD 100 schematic anyone ?

Does anyone have the schematic of either one or both of these amps ?

Regards

Charles
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Old 20th February 2008, 03:34 PM   #2
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Hello

The amp section of HD250 integrate amp are same than the ZD100, here is the HD250 schematic.

http://www.audio-circuit.dk/Schemati...HD250-ZD22.pdf

Bye

Gaetan
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Old 20th February 2008, 03:49 PM   #3
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Hi Gaetan

This is indeed supercooooooool !

Thanks

Charles
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Old 3rd April 2008, 08:25 AM   #4
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There seem to be large differences regarding layout etc between these three, so I would be grateful if someone had the ZD 50 and ZD 100 manuals since this would make servicing easier.

Regards

Charles
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Old 20th February 2009, 09:14 AM   #5
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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/...ctions0006.JPG

Bye

Gaetan
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Old 20th February 2009, 09:24 AM   #6
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I bet these amps sound pretty good, gaetan8888 ???
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Old 20th February 2009, 09:39 AM   #7
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Hello

I also found this ZD50 output section schematic.

Bye

Gaetan
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File Type: jpg zd50 output schematic.jpg (48.3 KB, 237 views)
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Old 20th February 2009, 09:40 AM   #8
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Hello

I also found this ZD50 power supply regulator section schematic.

Bye

Gaetan
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File Type: jpg zd50 power supply regulator schematic.jpg (46.9 KB, 201 views)
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Old 20th February 2009, 09:49 AM   #9
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Quote:
Originally posted by homemodder
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

Click the image to open in full size.
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Old 20th February 2009, 11:16 AM   #10
jaycee is offline jaycee  United Kingdom
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it's what we would now refer to as a diamond buffer. See Steve Dunlap's KRILL amplifier on this board for use of one.
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