HI,
I found the schematic of the Classè DR9 power amp.
Does anybody have an advice on this amp? Since the cost for materials is not negligible, I wonder if it's worth.
Thanks
I found the schematic of the Classè DR9 power amp.
Does anybody have an advice on this amp? Since the cost for materials is not negligible, I wonder if it's worth.
Thanks
Its not a complicated amplifier looking at the schematic ---only 12 BJT,s in the power amp section .
Your costs then would be the power supply but you don't need the two US voltage tappings as you live in Italy =230 volts AC /50Hz.
I was wondering why no schematic for the rest of this amplifier ---till--
I found out they were rather "secretive " about the devices used --see-
Classe Audio DR-9 - Stereo Amplifiers & Pre-Amps - StereoNET
I hope you have the full details of devices & the rest of the circuits ?
Your costs then would be the power supply but you don't need the two US voltage tappings as you live in Italy =230 volts AC /50Hz.
I was wondering why no schematic for the rest of this amplifier ---till--
I found out they were rather "secretive " about the devices used --see-
Classe Audio DR-9 - Stereo Amplifiers & Pre-Amps - StereoNET
I hope you have the full details of devices & the rest of the circuits ?
yes, you can find the full schematic here (single channel)
http://www.analogue-repair.it/Immagini/DR3.zip
I wonder how it would play
http://www.analogue-repair.it/Immagini/DR3.zip
I wonder how it would play
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Still no information as to the output devices on your schematic just a ? mark .
I noticed that the input devices are marked MPS 8599 which several modern manufacturers have rightly labelled "audio " but my old equivalent book shows the original manufacturer has them as "audio--low noise " .
As they are at the input it would be logical to fit low noise BJT,s .
My old book labels them MOT but MOT is now MOT -Semicon and if you are looking for MOT devices it's now Hong Kong you get them from.
While Semicon has a German office I have a feeling its Taiwan ,maybe somebody can post the main manufacturing plant address ?
I noticed that the input devices are marked MPS 8599 which several modern manufacturers have rightly labelled "audio " but my old equivalent book shows the original manufacturer has them as "audio--low noise " .
As they are at the input it would be logical to fit low noise BJT,s .
My old book labels them MOT but MOT is now MOT -Semicon and if you are looking for MOT devices it's now Hong Kong you get them from.
While Semicon has a German office I have a feeling its Taiwan ,maybe somebody can post the main manufacturing plant address ?
I'm sorry I linked the wrong schematic! This is the right one:
http://www.analogue-repair.it/Immagini/dr9.zip
http://www.analogue-repair.it/Immagini/dr9.zip
I've converted to pdf
still Q8 code is missing (darlington npn before the output stage) and there is some doubt about the output inductance, but it seems to be a good starting point...
still Q8 code is missing (darlington npn before the output stage) and there is some doubt about the output inductance, but it seems to be a good starting point...