@kofibaffour : I am sure it's my pre Amp.
I guess it has to do with aging components.
But I hope someone can give me clues?
Sound becomes less open/smeared (less detailed)
Hi all.
Strange phenomena but when I play music (and leave my set on for days) the sound becomes less detailed (smeared). I know it's the pre amp (Bryston BP25).
After switching it off and then switching it on (after waiting a couple of minutes) the sound is more open and detailed.
It's strange because I also have the general experience when listening to stuff which has been turned on not long ago, sound is a little harsh and grainy at first. With use it gets more fluid and smooth. But my experience with this preamp is many times the opposite (but just after many hours).
Can someone explain this behaviour?
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- 29 posts total
I am by no means an engineer, but what you describe sounds like some component in you preamp is reaching a saturation level and not normalizing or discharging as it should. Most older devices need to be re-capped at some point. Replacing old capacitors seems to be something that many audiophiles have done to their older power supplies more often than anything else. I just had my old Linn LP12 PS re-capped a few months ago. Since caps take up a charge and then discharge it in order to stabilize power, it may be the issue. |
@maam522a : I suspect the electrolytics although I can’t see anomalies. |
Long-time Bryston owner here and, yes, I have the BP25 also in its 26th year with still great performance and no problems. Please contact Bryston technical support with your questions and, yes, I am speaking from experience. They are excellent to work with though it might take them a day or two to get back to you. Just go to the main website and scroll down. You'll see the contact form with a box for your question at the bottom of the page. This is the best and fastest course to a good result. Bryston – Music for a Generation
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If I were you , I’d contact Bryston. Then I would ship the pre and have it brought back up to spec. I recently sent a pair of mono bloc amps to a different manufacturer because ONE had an issue. At 55 lbs each, I was hesitant to ship the second as I perceived that it was FINE. The one with the issue had a bad resistor . But once on the test bench , they were BOTH diagnosed with weak diodes in their rectifier circuits. My point is your pre needs to go on the diagnostics bench. I would recommend using Pirate Ship too. Best of results, Mike B. |
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