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technics SU-CH9 mini-system amplifier
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Greg Allen
Sep 4, 1998, 3:00:00 AM9/4/98
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This is a Bi-Amp from a Technics mini-system from about 1990/91. After 15
minutes of use, at moderate volume levels the bass side amplifier cuts out
on both channels with a loud click (heard on the speakers). Power off, wait
a few seconds, power on fixes it. No visible signs of fault - dust etc. Any
clues, or suggestions for repair (London UK).
minutes of use, at moderate volume levels the bass side amplifier cuts out
on both channels with a loud click (heard on the speakers). Power off, wait
a few seconds, power on fixes it. No visible signs of fault - dust etc. Any
clues, or suggestions for repair (London UK).
cheers,
Greg Allen
Mzacharias
Sep 8, 1998, 3:00:00 AM9/8/98
to
Hope I'm not stating the obvious, but solder connections in the area of the
outputs (or output IC). might be a good place to start. Also look at the
regulator transistors, and generally inspect for bad solder connections. If
there are none, there could be an actual amp circuit problem (especially if
it's an output IC or flat-pack transistors).
outputs (or output IC). might be a good place to start. Also look at the
regulator transistors, and generally inspect for bad solder connections. If
there are none, there could be an actual amp circuit problem (especially if
it's an output IC or flat-pack transistors).
Mark Z.
Wichita, KS.
John Woodgate
Sep 8, 1998, 3:00:00 AM9/8/98
to
In article <6sovl3$8fh$1...@plug.news.pipex.net>, Greg Allen
<Greg....@dial.pipex.com> writes
>This is a Bi-Amp from a Technics mini-system from about 1990/91. After 15
>minutes of use, at moderate volume levels the bass side amplifier cuts out
>on both channels with a loud click (heard on the speakers). Power off, wait
>a few seconds, power on fixes it. No visible signs of fault - dust etc. Any
>clues, or suggestions for repair (London UK).
>
What does it use for audio output stages? If it's a module (black case
about 75 by 50 mm, with several pin-outs), the thermal protection may be
operating. Is any ventilation obstructed?
>
<Greg....@dial.pipex.com> writes
>This is a Bi-Amp from a Technics mini-system from about 1990/91. After 15
>minutes of use, at moderate volume levels the bass side amplifier cuts out
>on both channels with a loud click (heard on the speakers). Power off, wait
>a few seconds, power on fixes it. No visible signs of fault - dust etc. Any
>clues, or suggestions for repair (London UK).
>
about 75 by 50 mm, with several pin-outs), the thermal protection may be
operating. Is any ventilation obstructed?
>
--
Regards, John Woodgate, Phone +44 (0)1268 747839 Fax +44 (0)1268 777124.
OOO - Own Opinions Only. You can fool all of the people some of the time, but
you can't please some of the people any of the time.
cmen...@gmail.com
Aug 18, 2013, 7:47:10 AM8/18/13
to
El viernes, 4 de septiembre de 1998 04:00:00 UTC-3, Greg Allen escribió:
> This is a Bi-Amp from a Technics mini-system from about 1990/91. After 15 minutes of use, at moderate volume levels the bass side amplifier cuts out on both channels with a loud click (heard on the speakers). Power off, wait a few seconds, power on fixes it. No visible signs of fault - dust etc. Any clues, or suggestions for repair (London UK).cheers,Greg Allen greg....@dial.pipex.com
Greg, you have a state of the art piece of equipment. It seems that maybe something related to temperature is bodering after a few minutes. review this and change the ventilation device is cheap and easy. I have one at home and one day decided to connect it to a pair of B&W DM603 that allows bywiring and the result I got is incredible. The quality of sound is hard to believe and has nothng to do compared to the original speakers. I also tried the same speakers with things like YAMAHA M65 (power amp 170 W per channel), YAMAHA RVX 795, Luxman 1000 series and none of them are close to the sound of hte Panasonic / Technics.Also I have apair of MS speakers and tried with again excelent results. Good luck with your SC.
> This is a Bi-Amp from a Technics mini-system from about 1990/91. After 15 minutes of use, at moderate volume levels the bass side amplifier cuts out on both channels with a loud click (heard on the speakers). Power off, wait a few seconds, power on fixes it. No visible signs of fault - dust etc. Any clues, or suggestions for repair (London UK).cheers,Greg Allen greg....@dial.pipex.com
Greg, you have a state of the art piece of equipment. It seems that maybe something related to temperature is bodering after a few minutes. review this and change the ventilation device is cheap and easy. I have one at home and one day decided to connect it to a pair of B&W DM603 that allows bywiring and the result I got is incredible. The quality of sound is hard to believe and has nothng to do compared to the original speakers. I also tried the same speakers with things like YAMAHA M65 (power amp 170 W per channel), YAMAHA RVX 795, Luxman 1000 series and none of them are close to the sound of hte Panasonic / Technics.Also I have apair of MS speakers and tried with again excelent results. Good luck with your SC.
Michael Black
Aug 18, 2013, 12:02:37 PM8/18/13
to
system is from 1990/91.
Read the date on the messages before you post. "Greg" isn't here anymore,
and chances are good he wasn't here much longer than that post. Hardly
anyone sticks around.
Michael
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