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Old 4th March 2010, 12:35 PM   #21
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How do people think, is it a good idea to implement BSS192 transistors instead of IRF9610 in Aleph-5 schematics?
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Old 4th March 2010, 08:00 PM   #22
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Worth a try. The original IRF9610 aren't all that great due to
the "IR P channel issue" where the transconductance has a
gain shelf in the audio band.

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Old 4th March 2010, 09:05 PM   #23
galop is offline galop  Slovenia
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I dont know where can i ask question about A5.How can avoid a thump(about 6v dc)on output when i power on the aleph?Thank you
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Old 4th March 2010, 09:10 PM   #24
Blues is offline Blues  United States
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Try a 3 to 4 uF cap across the zener ref on the CCS of the input differential.
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Old 4th March 2010, 10:16 PM   #25
Rony1 is offline Rony1  United States
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This is exactly what I found! I got my hand on an original A5 and have been listening for a few days now. Like you describe F5 is wonderful, very crisp, but A5 has more detail, open and focus. The F5 lacks the detail, I could clearly hear more "noise" in between instruments playing, and this is without playing loud. The A5 better defines the individual instruments and positioning, it also has a warmer sound, not as sharp as the F5. My guess is that the pure class A SE design of the A5 is the main reason, push-pull on F5 output stage is not as good of a match to air properties as of being SE.

Saying that this is very system dependent, you need to have good speakers to be able to tell these differences. If your speakers are not that detailed at the hi frequency band then F5 may sound better, but it is actually not in my opinion.

Again do not get me wrong, F5 is an AMAZING SOUNDING AMP, but to my ears A5 is even better, at least in my system.

I am wondering what are the conditions for the A5 to clip? I am using an Aleph P, which has 16 dB gain I believe, using RCA - unbalanced. I can run full volume, using RCA on A5 or 20 dB gain, and I do not believe I hear any clipping. I have to be careful though…

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Originally Posted by galop View Post
Thank you,i will put bridges on bottom plate when will replace PSU resistors with coils,because bottom plate is even hotter.Hm i think the aleph 5 is better ,after listening about 5 hours of jazz and acoustic music on A5 i plug back F5 and sound become less detailed and open,more flat,maybe because of my loudspeakers.Dont understand me wrong,F5 still sound superb, but A5 is sounds better on my speakers.
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Old 5th March 2010, 12:27 AM   #26
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Quote:
Originally Posted by Rony1 View Post
This is exactly what I found! I got my hand on an original A5 and have been listening for a few days now. Like you describe F5 is wonderful, very crisp, but A5 has more detail, open and focus. The F5 lacks the detail, I could clearly hear more "noise" in between instruments playing, and this is without playing loud. The A5 better defines the individual instruments and positioning, it also has a warmer sound, not as sharp as the F5. My guess is that the pure class A SE design of the A5 is the main reason, push-pull on F5 output stage is not as good of a match to air properties as of being SE.

Saying that this is very system dependent, you need to have good speakers to be able to tell these differences. If your speakers are not that detailed at the hi frequency band then F5 may sound better, but it is actually not in my opinion.

Again do not get me wrong, F5 is an AMAZING SOUNDING AMP, but to my ears A5 is even better, at least in my system.

I am wondering what are the conditions for the A5 to clip? I am using an Aleph P, which has 16 dB gain I believe, using RCA - unbalanced. I can run full volume, using RCA on A5 or 20 dB gain, and I do not believe I hear any clipping. I have to be careful though…
How does the lower end compare? Which has better bass? Tighter and/or better defined? I am contemplating building the Aleph5. I think I have a sense of the mid and highs i can expect because I have an Aleph3 but it is lacking in the low end.
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Old 5th March 2010, 12:57 AM   #27
Rony1 is offline Rony1  United States
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The Aleph 5 low end is beautiful, nice tight and plenty. The Aleph 5 can handle more power so when you raise the volume you do not get the distortion like in the F5, this is true across the whole frequency band. You just need to let the Aleph 5 warm up to operating temperature, at least 1 hour, to get the bass to its optimal tightness. For modest volume the F5 low end is also impressive, this amp is really a masterpiece, so simple but yet so incredible.

I Also wanted to add that what I found is that it does not matter what type of music you listen to, Jazz, Classical, or Rock the Aleph 5 is good for all of them. The same is true for the F5, I could not say that one is better for a particular type of music. Again it’s the whole package not just the Power Amplifier that makes the final sound.

When your system is good you can raise the volume and still be able to enjoy the music, the distortion is very low so it is not painful. Just be careful not to damage hearing, there is no reason to listen to loud music for long periods, it is tempting though...
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How does the lower end compare? Which has better bass? Tighter and/or better defined? I am contemplating building the Aleph5. I think I have a sense of the mid and highs i can expect because I have an Aleph3 but it is lacking in the low end.
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Old 5th March 2010, 02:15 AM   #28
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Originally Posted by Rony1 View Post

When your system is good you can raise the volume and still be able to enjoy the music, the distortion is very low so it is not painful. Just be careful not to damage hearing, there is no reason to listen to loud music for long periods, it is tempting though...
What kind of speakers do you use, may I ask? Sensitivity, nom. impedance etc. Thanks
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Old 5th March 2010, 02:37 AM   #29
Rony1 is offline Rony1  United States
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At the moment DIY Statement Monitors, 86 dB, 4 Ohm. You can find them on the HTGuide forum. Low end is not as powerful as the full size Statements (my brother built both of them) but incredible low end. The 7" 4 Ohm RS Dayton is really good.


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What kind of speakers do you use, may I ask? Sensitivity, nom. impedance etc. Thanks
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Old 5th March 2010, 04:37 AM   #30
Blues is offline Blues  United States
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[QUOTE=Rony1;2107540The Aleph 5 low end is beautiful, nice tight and plenty. The Aleph 5 can handle more power so when you raise the volume... [/QUOTE]

Aleph CS working...
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