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Old 18th December 2012, 01:28 AM   #81
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Originally Posted by Pano View Post
It has some tubes, I hope!
I hope NOT !
MUCH more interesting ......
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Old 18th December 2012, 03:00 PM   #82
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Originally Posted by petavgeris View Post
The uniqueness lies not in the aesthetics and how good the iron pieces look but how well they are designed and how well and precisely they have been wound. If you do not know the theory behind electromagnetism, it is not possible to design audio transformers. There exist numerous parameters and you have to manage all of them. Remember, this amp has absolutely nothing in signal path except interstage and output transformers.
Thanks for your kind words.
Peter.
Peter, thank you for sharing your experience. It's an extraordinary build and something to keep in our minds. However, what I'm wondering is, the reason for such design is for the quality of amplified signal, right? In that case the question becomes, how far should the amplifier design go when the speaker produces much more distortion than average build amplifier? In other words, is it worth the effort when such fine amplified signal gets "trashed" by the speaker itself?

Now, if the prime objective for such build was something other than the sound quality, then yes, I think it's worth the effort. What say you?
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Old 18th December 2012, 04:59 PM   #83
Cassiel is offline Cassiel  Libya
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I was thinking this not a typical DIY amp. Too much work. Are you selling it?
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Old 18th December 2012, 05:33 PM   #84
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Originally Posted by petavgeris View Post
...this amp has absolutely nothing in signal path except interstage and output transformers.
At least one power supply capacitor is in the signal path...
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Old 18th December 2012, 09:45 PM   #85
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Originally Posted by Evenharmonics View Post
Peter, thank you for sharing your experience. It's an extraordinary build and something to keep in our minds. However, what I'm wondering is, the reason for such design is for the quality of amplified signal, right? In that case the question becomes, how far should the amplifier design go when the speaker produces much more distortion than average build amplifier? In other words, is it worth the effort when such fine amplified signal gets "trashed" by the speaker itself?

Now, if the prime objective for such build was something other than the sound quality, then yes, I think it's worth the effort. What say you?
Thank you for your good words.
I think that some experienced guys who are well involved into building high quality amplifiers, can well imagine what I have been through in order to accomplish this project. The effort, pain and courage to finish it successfully could well be described as 'immense'.
Speakers do indeed produce high distortion compared to the one of the amplifiers, but experience has told me that the speaker AND the amplifier seen as a whole, account at least to the 80% of the sound we perceive. Plug on this amp a moderate speaker and you will listen good, plug a good speaker and you will listen very good, plug a very good speaker and you will listen extraordinarily good. You can't avoid the influence of the speaker but the critical role belongs to the OUTPUT STAGE. This is what I have gained from my experience building amps.

The objective of this amp was to give something unique in terms of performance AND aesthetics, both at the same time. I am the designer and manufacturer so I am not responsible to make the criticism. The end result is here, available to anybody who would like to experience something that probably has never been made so far.
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Old 18th December 2012, 10:04 PM   #86
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Originally Posted by Cassiel View Post
I was thinking this not a typical DIY amp. Too much work. Are you selling it?
I have been offered to manufacture this amplifier. It is obvious that its cost is outrageous, could be described as sky-high, but again this is in relation to the financial means of the owner. I am not selling the amplifier for my profit, was just asked to make something very good and of course this covers all financial aspects, parts cost, labour cost etc.

I am not selling this kind of amplifiers nor I have the intention to do it in the near future. I am designing and manufacturing amplifiers only on a custom order basis for some few people who want (and of course have the financial means) to acquire something that qualifies as exotic, both in terms of performance and aesthetics. Everything is done in full communication with the owner. I only deal with those who do not like (serious) compromises but prefer to enjoy their lives spending their free time together with their family or good friends listening to music.
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Old 18th December 2012, 10:06 PM   #87
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Originally Posted by Vincent77 View Post
At least one power supply capacitor is in the signal path...
Power supply caps are not part of the signal.
You may consider the cathode capacitor as part of the signal but this is another sory, some agree and some others disagree on this.
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Old 19th December 2012, 12:13 AM   #88
12B4A is offline 12B4A  United States
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Originally Posted by petavgeris View Post
Power supply caps are not part of the signal.
I have trouble reconciling this statement with the fact that power supply capacitors are part of the network of components that supply energy to every stage of the amplifier. This is especially troubling when I grant your statement to be true and make the logical move from there to wondering why the capacitors are there at all if they are not part of signal amplification.
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Old 19th December 2012, 12:20 AM   #89
cotdt is offline cotdt  United States
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Originally Posted by Vincent77 View Post
At least one power supply capacitor is in the signal path...
True... but why bring this up? The "signal path" used as a term, in most circles, does not include the power supply, even though the power supply is what generates the output. Just like when someone says "family" it may not include a long lost half brother regardless of immediate blood relations.

When someone says "no capacitors in the signal path..." most of us know what he means, even though technically this may be impossible to accomplish.
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Old 19th December 2012, 12:48 AM   #90
JoshK is offline JoshK  Canada
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The fact that you wound your own iron speaks volumes to your commitment to this project in my mind and I've seen not too many projects approach it.
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