pinkmouse said:
Upupa Epops said:
I'm not too fussed about roundy square waves (mine looked perfect when i tested it!!!), or any other things, mine sounds awesome, that's what matters 😉
Aaron
Well if I have said it once I have said it a thousand times, if you want to stop the ringing then answer the damn phone! 🙂
Regards
Anthony
Regards
Anthony
Upupa Epops said:
If you look back to the scope pics a few pages ago you will see the difference! 🙂
Unfortunately, I only have several DMMs and a scope. I would like to get some distortion and frequency response measuring kit, but as always, the problem is money...
At 10kHz i too seriously doubt that you can see a difference at all.
But i can not imagine anyone claiming that linearity at 20kHz is the same for a 4 or a 40 MHz device.
I am quite surprised to read that it makes no difference what bandwidth a device has behind a 500 KHz filter.
Can someone stop the ringing in my head ?
I cant seem to find the button.
But i can not imagine anyone claiming that linearity at 20kHz is the same for a 4 or a 40 MHz device.
I am quite surprised to read that it makes no difference what bandwidth a device has behind a 500 KHz filter.
Can someone stop the ringing in my head ?
I cant seem to find the button.
Regarding Riniging or other form of Component interactions, my favourite is "Sympathetic Resonance", at what point does it become applicable to real world listening?
I mean is this, surely more noxious effects are background noise or dynamic compression and so on. What noticeable effect does a microsecond burst of ringing or overshoot have on the final product?
Regards
Anthony
I mean is this, surely more noxious effects are background noise or dynamic compression and so on. What noticeable effect does a microsecond burst of ringing or overshoot have on the final product?
Regards
Anthony
Al, I saw your final part list. There is compensation capacities 22 pF, while at first there was 390 pF. It is reason, why is 10 kHz perfect, not changing of output devices ( I hope ). 😎
Pavel, I never used the 330pF, until I started tweaking the compensation cap, both outputs used 47pF.
Anthony, ringing on a transient produces high frequency distortion, this can lead to a false perception of detail and clarity.
Anthony, ringing on a transient produces high frequency distortion, this can lead to a false perception of detail and clarity.
Al,
as you already have your paws spread, let me give you a hug.
Very kind to do that just for me.
as you already have your paws spread, let me give you a hug.
Very kind to do that just for me.
rounding
The mj15003/4 are relatively slow, but in the context of reproducing music replayed from a CD or equivalent source lets not kid ourselves they are plenty fast. If the newer transistors sound better it's probably to do with gain linearity, high current Hfe, etc. The fact that the newer transistors have their die optimized for audio use makes a huge difference. For those that haven't seen them, in the datasheets On Semi actually quotes a specific and low, level of distortion for these transistors (mjx21193/4, mjl2301/4281) when used in audio circuits.
Al (PinkMouse), if you have a PC with a good soundcard, check out www.rightmark.org , they have a free (GPL) piece of software for a pretty complete test of audio amps. If you have a 192k/24bit card it can give really, really good results. As soon as I get the big Krell running I plan on testing it with the software, maybe I'll stop and test the little krell...
Stuart
The mj15003/4 are relatively slow, but in the context of reproducing music replayed from a CD or equivalent source lets not kid ourselves they are plenty fast. If the newer transistors sound better it's probably to do with gain linearity, high current Hfe, etc. The fact that the newer transistors have their die optimized for audio use makes a huge difference. For those that haven't seen them, in the datasheets On Semi actually quotes a specific and low, level of distortion for these transistors (mjx21193/4, mjl2301/4281) when used in audio circuits.
Al (PinkMouse), if you have a PC with a good soundcard, check out www.rightmark.org , they have a free (GPL) piece of software for a pretty complete test of audio amps. If you have a 192k/24bit card it can give really, really good results. As soon as I get the big Krell running I plan on testing it with the software, maybe I'll stop and test the little krell...
Stuart
pinkmouse said:
Let's be safe, we fry 'm both !
If the familiar devices are all that bad, i do not understand why everybody liked Krell's, Threshold and Mark Levinson amplifiers.
In the top years of those i was amazed how difficult the three life made for exotic Japanese power amplifiers.
And those were already employing the fast devices in the 80s.
Makes me think of chip threads, with OPA's and AD797's on sale for 15 everyone is rambling on of how incredibly bad OP27's, NE5534, and the like are.
imo, a Rod Elliot with fancy outputs is still a Rod Elliot.
(i do not own a Rod Elliot)