X100 backengineered here

[DarkOne]

Thanks for your rule of the thumb mr.Pass.
The distortion you are talking about is seen in my mesurements
Probably the reason why I could not hear the difference is that I don't listen very loud, so output devices operate in class A most of the time. When I play loud my loudspeaker start to resonate, so I don't hear amplifier's but loudspeaker's flaws. Maybe with new loudspeakers (in progress) I will hear the difference and decide to raise idle current to 3-4 amps (maybe more )

Regards
Robo

[Wavebourn]

Originally posted by Petter


I am very interested in feedback on this design (which is based on patents held by http://www.passlabs.com and thus not available for anything but research).

They forgot to patent a method of connecting of wires using high temperature.

The amp will defenitely work fine, but I'd add a servo loop to avoid the need to carefully match pairs.

[Wavebourn]

Originally posted by LBHajdu
I just wanted to draw peoples attention to this interesting push-pull X design. The author has built it and says good things about it.

My AB amp inspired by AlephX

Leve

Classical opamp with differential output.

[Villaw]

Has anyone managed to print our a pcb layout of this yet? I would be quite interested in comparing the sounds of these designs with other so called "famous" designs, even though 25w is well below the "ideal" power output for me.

Obviously dont want to infringe any copyright/patent protections here so Mr. Pass if I'm stepping on some toes here please let us know.

[DarkOne]

Originally posted by Wavebourn


They forgot to patent a method of connecting of wires using high temperature.

The amp will defenitely work fine, but I'd add a servo loop to avoid the need to carefully match pairs.

Why DC servo? It has DC offset about 30mV. Transistors are matched to get low DC on output, but more important benefit is less distortion, because matched transistors are mirror like images of each other (better cancelation of distortion).

Robo

[Villaw]

ZZZZZZZZZZZZZZZZ..................

[DarkOne]

Originally posted by Villaw
Has anyone managed to print our a pcb layout of this yet? I would be quite interested in comparing the sounds of these designs with other so called "famous" designs, even though 25w is well below the "ideal" power output for me.

Obviously dont want to infringe any copyright/patent protections here so Mr. Pass if I'm stepping on some toes here please let us know.

PCB Layout is available (just email me toudy@chello.sk)
I have no comparsion with another "famous" designs yet
It's not 25W amp. My current amp runs +-24V power supply and can push more than 80W with less than 1% THD. I't bias has been set to give 25W@8ohm in class A, then it will switch to class AB at higher level.

Regards
Robo

[h_a]

@Petter: X5-service manual is now available! So if you want to further refine your X100, don't hesitate!

Cheers, Hannes

[Nelson Pass]

Originally posted by h_a
@Petter: X5-service manual is now available! So if you want to further refine your X100, don't hesitate!

Technically it's not. I recently sent a copy to a user with a need,
however you are free to distribute it discreetly via email on this
forum.

[h_a]

Of course!!

Shame on me for not being more precise on that point!

I'm absolutely sure nobody here (including me) is going to handle such valuable stuff other than in a sense that has your thumps up!

Thanks and sorry for being not more clear, Hannes