Waveform distortion on Aleph 30! - Page 3

panos29 · 20th May 2003, 07:45 PM

pic5

panos29 · 20th May 2003, 07:46 PM

pic6

panos29 · 20th May 2003, 07:47 PM

pic7

panos29 · 20th May 2003, 07:48 PM

and finally pic8!

panos29 · 22nd May 2003, 02:44 PM

Obviously there is no interest in measurements concerning the aleph diy clones. Probably these should not be judged at all based on square waves and this may be the truth, but I am concerned a bit about the square wave looks at high frequencies. Maybe Mr Pass alone, can make a simple comment about if these waveforms are the normal behaviour of aleph amps, or its just mine??

Sincerely,

Panos

nobody special · 22nd May 2003, 05:44 PM

Did you figure it out yet? I'm interested...

Asen · 22nd May 2003, 06:47 PM

The amp has a slight high-frequency roll-off, which may be is the reason for what you see on your scope when square waves are measured. Filters are easy to be seen in square waves.

Andypairo · 23rd May 2003, 07:48 AM

Quote:

Originally posted by panos29
Obviously there is no interest in measurements concerning the aleph diy clones. Probably these should not be judged at all based on square waves and this may be the truth, but I am concerned a bit about the square wave looks at high frequencies. Maybe Mr Pass alone, can make a simple comment about if these waveforms are the normal behaviour of aleph amps, or its just mine??

Sincerely,

Panos

I haven't my Aleph here (borrowed by a fiend) but if I remember well wavwforms were quite similar.

You can't expect a perfect 10 or 20 kHz square wave because its harmonics go well over the power bandwidth of the amp.

PS what's the impedance of your speakers?

Cheers

Andrea

panos29 · 23rd May 2003, 03:03 PM

Dear Andrea,

I thought I cannot expect perfect 10&20khz square waves, but my squarewaves seem to be way too bad at least to my limited experience with audio amplifiers. But every other simple push pull I have measured got better figures! Even a 20 year old pioneer I had in storage!
Anyway, all measurements were done on 8 ohm wire wound power resistors. The sound is very good on my Tannoys HPD385s in 90 lt ported cabinets, but very uncontroled and harsh on my mission 762s. As a pre I use my aleph-P clone and source is a heavily tweaked pioneer PD-S707.

Andypairo · 23rd May 2003, 03:39 PM

I have experienced some lack of control in the bass region (B&W DM604) , and this evening I'm going to a friend's house to listen to it with a audax TL kit, the "Nausicaa"; my friend reported some problems, probably due to the low impedance of the speakers, tomorrow I'll be more precise....

Cheers

Andrea

22nd May 2003, 02:44 PM	#25
panos29 diyAudio Member Join Date: Dec 2001 Location: ATHENS, GREECE	No Interest Obviously there is no interest in measurements concerning the aleph diy clones. Probably these should not be judged at all based on square waves and this may be the truth, but I am concerned a bit about the square wave looks at high frequencies. Maybe Mr Pass alone, can make a simple comment about if these waveforms are the normal behaviour of aleph amps, or its just mine?? Sincerely, Panos

22nd May 2003, 05:44 PM	#26
nobody special diyAudio Member Join Date: Oct 2002 Location: USA	Did you figure it out yet? I'm interested... __________________ Nobody

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22nd May 2003, 06:47 PM	#27
Asen diyAudio Member Join Date: Jan 2001 Location: Sofia	The amp has a slight high-frequency roll-off, which may be is the reason for what you see on your scope when square waves are measured. Filters are easy to be seen in square waves.

23rd May 2003, 03:03 PM	#29
panos29 diyAudio Member Join Date: Dec 2001 Location: ATHENS, GREECE	Dear Andrea, I thought I cannot expect perfect 10&20khz square waves, but my squarewaves seem to be way too bad at least to my limited experience with audio amplifiers. But every other simple push pull I have measured got better figures! Even a 20 year old pioneer I had in storage! Anyway, all measurements were done on 8 ohm wire wound power resistors. The sound is very good on my Tannoys HPD385s in 90 lt ported cabinets, but very uncontroled and harsh on my mission 762s. As a pre I use my aleph-P clone and source is a heavily tweaked pioneer PD-S707.

23rd May 2003, 03:39 PM	#30
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	I have experienced some lack of control in the bass region (B&W DM604) , and this evening I'm going to a friend's house to listen to it with a audax TL kit, the "Nausicaa"; my friend reported some problems, probably due to the low impedance of the speakers, tomorrow I'll be more precise.... Cheers Andrea

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