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Old 21st December 2008, 10:37 AM   #151
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Quote:
Originally posted by ostripper

because of your ground referenced cascode in the VAS...
I got rid of mine ,a further departure from the symasym.
Hi OS,
The real Mona Lisa here is this VAS and I'm not about to paint a mustache on it
There is an old expression: "If it ain't broke..."

PSRR of this amp is at least 20db better than my Patchwork (I won't comment on other amps I've simmed ). If this is still not good enough, the door is open to supplying the front end separately.
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Old 22nd December 2008, 07:48 AM   #152
KLe is offline KLe  Australia
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Nice John and stunningly nice PCB
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Old 22nd December 2008, 08:10 PM   #153
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Quote:
Originally posted by KLe
Nice John and stunningly nice PCB

Thanks KL,
I have the new layout with copper silkscreen board fully populated and tested. It passed with honours.
Shot of the top:

Click the image to open in full size.

And of the many legged bottom:

Click the image to open in full size.
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Old 22nd December 2008, 08:28 PM   #154
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SS (t-trak) porno.... an anology to the "tube porno" on
the "other side"...awesome stuff... I WANT A laser printer..

OS
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Old 22nd December 2008, 09:25 PM   #155
AKSA is offline AKSA  Australia
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Enough to make a hardened audio designer cry......

Beautiful work, John!

Hugh
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Old 22nd December 2008, 10:13 PM   #156
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Quote:
Originally posted by ostripper
SS (t-trak) porno.... an anology to the "tube porno" on
the "other side"...awesome stuff... I WANT A laser printer..

OS
Thanks OS,
Did you get that email I sent you? Offer still stands.


Quote:
Originally posted by AKSA
Enough to make a hardened audio designer cry......

Beautiful work, John!

Hugh

Thanks Hugh,
If you can't make them better, at least make them prettier.

I'm now officially ruined. I can't do any better than this design and really there isn't any reason to try. I don't need or want a better amp than this - I (and most others) wouldn't hear the difference anyway. It has low noise, it has high speed, amazing stability, very good PSRR, beautiful clipping performance. It has high power and the ability to drive a low impedance load. Oh, and it sounds great.
It's like the first season of Californication - where to go for season 2 but down?

The above may sound like bragging but anyone who has been reading this thread will know the difference. This is just my adaptation, my lucky changes, my paint brush smearing the brown CIL latex on the Da Vinci masterpiece.
My Abomination!
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Old 22nd December 2008, 10:22 PM   #157
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You can do 3 things to keep busy..MJL..

1. Offer your splendid design (PCB,silkscreen,etc)
for all to do..offer occasional support for (noobs).

2. Port your design for more power (higher rails, more OP
devices , or FET OP's)

3. As you seem to be a "one man board factory" sell
some to prospective constructors.

I am only a couple months behind you and I plan for all 3..
OS
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Old 22nd December 2008, 10:32 PM   #158
AKSA is offline AKSA  Australia
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John,

The work has just begun. OS is right. Stick with this power rating for the moment, now concentrate on the enclosure design, so you can offer plans, or even completed metalwork. Then you do all the assembly instructions; documentation is a long, difficult process and involves a lot of paraphrasing and photography.

Then you have to do advertising copy. 'Best amp in the world, biggest keeper in high end, yada yada, with sexy photos and endorsements.

Finally, you need reviews. This is another minefield, as you have to keep these guys on side. Be aware the product will be based on appearance first, perceived quality second. Reviews are very helpful, particularly if you can get some academic critic to rabbit on about the hermetic imaging, and elegantly encapsulated bass. A crystalline top end will help too!!

The product is technically very good, exceptional even, so you need to concentrate on presentation and marketing. If selling to the DIY crowd, the requirement is different, with more emphasis on performance and low cost.

Perhaps when you've negotiated this minefield we can all band together and form an association to protect our market position!!

Merry Christmas and thank you for sharing your lovely amp,

Cheers,

Hugh
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Old 22nd December 2008, 10:47 PM   #159
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Quote:
Originally posted by ostripper

3. As you seem to be a "one man board factory" sell
some to prospective constructors.

Quote:
Originally posted by AKSA
John,

The work has just begun. OS is right.

Pump the brakes, fellas!
I'm not in this to produce a sellable amp. I'm not even in this for the benefit of others - there are, after all, tons of good designs out there to build (including the one this is hacked from). My motives are purely selfish - it's all about me, me, ME! I have been doing this for the challenge and my own enjoyment - to learn and do.
I'm feeling postpartum depression here or some such. An anticlimax that has me wondering what I'll do next. I'll recover, maybe...
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Old 22nd December 2008, 10:53 PM   #160
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Merry Christmas to you too Hugh (rhymes) and happy new year! You also OS, my friends through this.

A little of the white stuff. I know you guys are not seeing it where you live, but I'm getting enough to share

Click the image to open in full size.

What I see when I look out my back door...


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