An increase in RMS current would break the law of conservation of energy.
The amplifier in question was a fully balanced design with a patented circuit that created in effect complementary N & P channel output FETs. With zero negative feedback (possible because of a single pole HF response out to several MHz) this design delivered less than 0.001% THD+N and PSRR was off the scale far better than contemporary designs at the time, and both THD and PSRR were further improved by 20dB of feedback applied. And yes, this amplifier kept getting better as power supply capacitance was increased to silly amounts.
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And this amplifier kept getting better as power supply capacitance was increased to silly amounts
And what did you ear ? 😉 I made my math too, not ingeneer , simply HAM (F4xxx callsign)
Happy to read that i'm not totally fool 🙂
And what did you ear ? 😉 I made my math too, not ingeneer , simply HAM (F4xxx callsign)
Happy to read that i'm not totally fool 🙂
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It's 35 years ago and my memory for detail is not so great that I will pretend to be able to detail this differences I heard then today.
In a general sense I heard more realism. At the time I was the sound master for a large multi venue performing arts facility and worked extensively with orchestras, bands and singers. My reference for judging sound reproduction has always been and is the sound of real acoustic sources, such as instruments and voices.
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As long you know how to calculate and construct correct limmiters and soft start or what else is necessary in order to avoid problems, only the sky is the limit about the capacitors (personally I use in my amp 2x 240000 uF ).
Can you show me a scope picture with the difference?
Two other things:
- are you familiar with the term 'marketing'
- PSRR is a property of the amplifier. IF you get lower noise, that doesn't mean you changed the PSRR, you cannot change it with caps in the supply.
Blindly going for those who make a buck on what they sell is one thing, but sometimes thinking for yourself and really investigating is not a bad thing.
Jan
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a picture ?! 😉
@Jan ok, when i'll have found some cans to stack ... other amps are modified, i don't waste time dismantling and rebuild them ...
Marketing ploy ? I asked mysetlf too until i made tests
PSRR ? No , no, no ... previously said : resistance NOISE of the ZERO of the voicecoil and its line (including huge section wires) 🙄
That's because ripple is a function of current, frequency and capacitance. Plus resistances and caps result in low pass filtering.
However it's a case of diminishing returns. Thus cost effectiveness for the manufacturer.
Second psu for each phase, for each channel and for each section would do the job - the resulting reduce current demand from each section and you need less caps plus reduce cross talk.
By the way, as the others have stated, it's possible to design an amp to reject PS noise (hence high PSRR). The way is simple as the supply rails are actually additional inputs into the amp. So you mix in noise into the amp and use the topology design that amplifies both the signal and the noise to cancel out the noise. The reality is you don't need nV noise floor, in fact the amp can happily cope with quite a bit of noise.
The down side is that your amp is doing more work (less of a problem really if you're running class A) which loads more onto the power supply for AB/B/.../D/... etc.
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If you find that increasing your power supply capacitors improves your sound
may I suggest that you add a voltage regulator instead as this will not increase
the current pulses in the transformer, rectifier and capacitor. It will give you less
ripple and transistors last longer with heat than capacitors do.
may I suggest that you add a voltage regulator instead as this will not increase
the current pulses in the transformer, rectifier and capacitor. It will give you less
ripple and transistors last longer with heat than capacitors do.
A couple of years ago I squeezed in some more caps and CLC in front end PS to an Adcom 5400, and the ripple on the front end got so low that my DVM could not read it, so I had to buy a scope if I wanted 'proof.'
So Jan, if you want scope pics of c, cC, cCRC, cCLC, cCCLCC, etc, then I can bring some stuff to Burning Amp...?
So Jan, if you want scope pics of c, cC, cCRC, cCLC, cCCLCC, etc, then I can bring some stuff to Burning Amp...?
Angenal Gilbert Yeung of blue circle is the master of power supply capacitance. I was auditioning an integrated amp and they had me close my eyes and listen to my favorite test record. Capacitance packs were added without me knowing (he was pretty practices at this) and each time I knew when and heard a "relaxing" of the sound as well as soundstage width and depth improvement. Mostly it all just seemed to flow smoother and more effortlessly and feel more like real music.
Since then I've been sold that there isn't really an upper limit to what capacitance can do.
