The volume control is set to "hardware control" via the DAC but still adjusted through the software interface.
I could put a pot before the amp input but the amp would still be running open so presumably this wouldn't stop the off pop.
I'll try a switch to the amp board and see if it still happens as suggested.
No, adding a potentiometer does not make the amplifier running "open". On the contrary. If you add a hardware volume control like a potentiometer, stepped attenuator or any other quality hardware solution it will do exactly as you operate it. It will have low volume if you turn it down. If turned down powering on a source will give a plop but far less loud/damaging. Also switching on a device with full output will not result in possible shock therapy and/or damage.
Software solutions give many (too much maybe) possibilities but when something goes wrong you may have full volume on the loudspeakers which might be not their favourite pastime.
Software solutions give many (too much maybe) possibilities but when something goes wrong you may have full volume on the loudspeakers which might be not their favourite pastime.
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Not sure if serious..
I'll be getting a few fresh 3e TPA3255 boards soon, which measurements should I perform straight out of the box and again after 72h of continuous use, and what differences will be visible in those measurements?
Also, what signal input should I be running in these first 72 hours - pink noise, or hip-hop, or..?
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As a tech I also testify... even if it makes me loose credibility
More in the field of electrolytic capacitors and coils but still. Also opamps that are just soldered in sound different after some time. Never found any difference in measuring but my ears did not lie. Well, I don't care what or why but I did learn to give devices some time powered on/playing before judging them.
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Anyone that has used Black Gate caps in the past can tell the same. I am in this hobby/profession for more than 40 years now, I build stuff like a madman (quantity and quality) and absolutely no one can convince me of the opposite.
It is not always so but sometimes the phenomenon occurs (and then it is repeatable with the same parts). One can stubbornly deny it because it is political correct to do so and ignore it or one can just accept the phenomenon without understanding it. I also can convince others if I wish but I don't. I am also a member of the "we" club you describe so I know what I say.
If one wishes to deny then it is simple: just let new equipment or new parts settle for a few hours and then judge the device/parts. Simple. No loss of credibility, no shame, no difficult explanations with nasty naysayers to do.
It is not always so but sometimes the phenomenon occurs (and then it is repeatable with the same parts). One can stubbornly deny it because it is political correct to do so and ignore it or one can just accept the phenomenon without understanding it. I also can convince others if I wish but I don't. I am also a member of the "we" club you describe so I know what I say.
If one wishes to deny then it is simple: just let new equipment or new parts settle for a few hours and then judge the device/parts. Simple. No loss of credibility, no shame, no difficult explanations with nasty naysayers to do.
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I'm building tube amps since 1988, before that I have worked with HF transmission. I have build tube amps and several other electronics for private users, professional musicians (classical music) and recording studios. I never heard that somebody denied the burn in phase.
To claim that one can measure everything is pure arrogance and total ignorance of science!
To claim that one can measure everything is pure arrogance and total ignorance of science!
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BTW, after over 30 years of experience I claim that solder joints need 48h to settle in. I had many customers in the last 3 decades who called me and said that it sounds hard or shrill after repairs. I had to tell the them to wait 2 days for solder joints and 50-100h for the new parts to settle in. All were satisfied, some of them were stunned about the change in sound.
The TPA3255 I have sounded totally shrill, uneven and ear piercing. I read here somebody claimed 70h burn in time. I calculated: Wednesday evening I would cross the 70h mark, then I sit down to listen and was also stunned about the quality of sound.
The TPA3255 I have sounded totally shrill, uneven and ear piercing. I read here somebody claimed 70h burn in time. I calculated: Wednesday evening I would cross the 70h mark, then I sit down to listen and was also stunned about the quality of sound.
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IMO Black Gate N series and NX are/were unique. That is if you have the patience to wait for them burning in as they really do need time. Haven't found anything better except film caps when possible as they tend to be larger. Todays polymer caps are not to be compared with BG.
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Agreed. I have noticed the same with solder. In fact I would say that this effect dominates over component (eg capacitor) burn-in.
