Netlist said:
The amp is stable both with unbalanced and balanced input. Only thing is that if I give "high level" input signal voltage at 100kHz, I see somewhat overshoot and ringing in the square wave which indicate excessive HF gain and low damping. All other characters are just fine.
I feel that the balanced input gives me somewhat better sound. The sound is a kind of young, determined, quick responding, clean, detailed and very much enjoyable. I am thinking that this amp could be used not for a sub system, but for my 2nd main system. I neither calculated nor measured the power. Anyhow, the sound level is loud, louder than enough.
Next week I will try 4ohm 92dB Ariel speakers.
This shows the face of the finished baby and the blue LED. Sized WxDxH 30cmx28cmx21.5cm.
JH
Attachments
Thanks; I knew it would be loud enough, certainly with your sensitive speakers.
I like the look of the amp, looks very solid and with the oversized heatsinks, it seems like you build a massive power amp. Compatible with Peter Daniel’s products!
/Hugo - happy now, with the blue led.😎
I like the look of the amp, looks very solid and with the oversized heatsinks, it seems like you build a massive power amp. Compatible with Peter Daniel’s products!
/Hugo - happy now, with the blue led.😎
Netlist said:
How to get a big big voltage swing without big big gain ? 😉
I try to built that soon.
What about a 1kW version ? 😎
Little Big Man
I have thought the heat sinks are oversized. But, I have found that they are of proper size. They are nearly cold on idling condition. Once the signal is injected, however, they get to rather warm. From this fact, the current booster is considered as being able to boost the current much more than required to the speaker impedance, probably even for the lower impedance speakers. If this is true, this amp would be of having a good output power. This is based on a presumption without any measurement or calculation, but with the heat sink temperature and with the quality of the sound.
Hmmm... I am very curious about the sound from my 4 ohm speakers. For the time being, however, nice music and movie sound firmly lock my *** into the listening seat. It seems that I should give a chance to the 4 ohm speakers later...
JH
With bread and coffee.
I have thought the heat sinks are oversized. But, I have found that they are of proper size. They are nearly cold on idling condition. Once the signal is injected, however, they get to rather warm. From this fact, the current booster is considered as being able to boost the current much more than required to the speaker impedance, probably even for the lower impedance speakers. If this is true, this amp would be of having a good output power. This is based on a presumption without any measurement or calculation, but with the heat sink temperature and with the quality of the sound.
Hmmm... I am very curious about the sound from my 4 ohm speakers. For the time being, however, nice music and movie sound firmly lock my *** into the listening seat. It seems that I should give a chance to the 4 ohm speakers later...
JH
With bread and coffee.
By the way, you guys are all doing extremely well, and it
looks like a much more interesting result than all those
gain-clones; after all, you actually got to do some real design.
😎
looks like a much more interesting result than all those
gain-clones; after all, you actually got to do some real design.
😎
Nelson Pass said:
Thanks, Nelson, wish I had more time for the moment.
You really give us a nice 'thumbs up' again.
Don't understand this. Asumed the 'X' is the same as the SuperSymmetry, it is possible to make an 'X' without OP's!? We've got all the recent Pass-designs, the AlephX...
Probably Bernhard wants to know if "This" circuit can be made without cfb-OP's? 😕 Please explain.
/Hugo - Is sure Bernhard will come up with something, one of these days.
Nelson Pass said:
I think we got real designs, also my new circuit with the additional transistors will work with rails up to +/-36V, and this will get lots of power
Netlist said:
Don't understand this. Asumed the 'X' is the same as the SuperSymmetry, it is possible to make an 'X' without OP's!? We've got all the recent Pass-designs, the AlephX...
Probably Bernhard wants to know if "This" circuit can be made without cfb-OP's? 😕 Please explain.
/Hugo - Is sure Bernhard will come up with something, one of these days.
My question was, if we do not use the cfb LM6181, but another vfb OP, will it still be supersymmetry ?
I already came up with my high power circuit, thats it.
For the moment I will forget about madness, its too much power for my 8 channels.
Also I found in this design the output devices will never run out of current so...
May be later.
DAMN!!!!!!!!!!!!!!!
I don't know if you have a BIG enough power supply for that little amp!
anyway, I can't wait to see it finished. You can nevery have enough power...........he he he he he he
Cheers..........
I don't know if you have a BIG enough power supply for that little amp!
anyway, I can't wait to see it finished. You can nevery have enough power...........he he he he he he Cheers..........
Bernhard said:
Bernhard,
As we discussed easrlier, the SS is a concept. It can be implemented with CF or VF opamps, or discrete devices for that matter. It is the unique cross-coupled feedback links that give it the SS signature. AFAIK, there is no reason why it could not be build with tubes (now there's a challenge if you want one).
Jan Didden
Attached shows PASS_YAX2_JH with 4 ohm 92dB Ariel speakers.
Loudness and sound quality are good. My immediate impression is however that they do not match well, particularly against bottom frequencies, which play important role of musical foundation. In this respect, the 6 ohm 86dB (maybe 88dB) Phase Technology PC80 speakers are much better for this amp to my subjective ears.
JH
PS. Wife's eyes shoots at the mess of living room. Garl...
Loudness and sound quality are good. My immediate impression is however that they do not match well, particularly against bottom frequencies, which play important role of musical foundation. In this respect, the 6 ohm 86dB (maybe 88dB) Phase Technology PC80 speakers are much better for this amp to my subjective ears.
JH
PS. Wife's eyes shoots at the mess of living room. Garl...
Attachments
jh6you said:
Yeah , I feel the same with Dynaudio , a pair of old small IMAGE ,
they are 89db into 6 ohm , but that mpedance is easy to drive into low frequencies.Otherwise there are 90db into 8 ohm loads speakers , (BandW) that presents peaks of low impedance in those ranges of freq were more energy is needed.
I've heard that those WIVES can require very large heat sinks to
dissapate extra heat sometimes... It's also rumored that they
have very LOW impeadences and can be very difficult to drive
to happy output levels!... but this is all theoretical to me because
i have no practical experience in dealing with them!
BTW, nice Ariel's JH... do you have a Tube SET amp to drive them?
moe29
dissapate extra heat sometimes... It's also rumored that they
have very LOW impeadences and can be very difficult to drive
to happy output levels!... but this is all theoretical to me because
i have no practical experience in dealing with them!
BTW, nice Ariel's JH... do you have a Tube SET amp to drive them?
moe29
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