Benoit62
New Head-Fier
I am the happy owner of a Stax SRA-3S amp (rebuilt -all recapped- by the seller, purchased some years ago, and used from time to time).
I recently discovered a strange issue : on both channels, on treble peaks/transient/abrupt notes (i.e : maracas recorded very close to microphone, or some synthetizers...), I can hear a kind of scratching noise, covering the treble signal.
This is not a level input / saturation issue, for lowering my dac output even to minimal level gives exactly the same result.
I have this scratching noise on all my Stax headphones, and it comes for sure from the SRA-3S amp, because the issue is not there when the headphones are used on two other amps (via SRD7 transformer box)
I wonder if this is just an old (60's) design issue, or some component failure (in this case this would be a bit mysterious, since it happens on both channels, the caps and valves are all recent, and the rest of the time the overall sound is clean...I cheked phono/pickup input using my dac on it to compare, and could hear the same scratching noise on treble : so it does not seem to come from the preamp parts, but more from the amp section)
Thank ou for your help...
I recently discovered a strange issue : on both channels, on treble peaks/transient/abrupt notes (i.e : maracas recorded very close to microphone, or some synthetizers...), I can hear a kind of scratching noise, covering the treble signal.
This is not a level input / saturation issue, for lowering my dac output even to minimal level gives exactly the same result.
I have this scratching noise on all my Stax headphones, and it comes for sure from the SRA-3S amp, because the issue is not there when the headphones are used on two other amps (via SRD7 transformer box)
I wonder if this is just an old (60's) design issue, or some component failure (in this case this would be a bit mysterious, since it happens on both channels, the caps and valves are all recent, and the rest of the time the overall sound is clean...I cheked phono/pickup input using my dac on it to compare, and could hear the same scratching noise on treble : so it does not seem to come from the preamp parts, but more from the amp section)
Thank ou for your help...
