Joshua_G said:
I'd be interested in knowing what you would be comparing?
Do you mean a complete discreete based op-amp versus IC?
If so would you not then start changing transistors, resistors, etc and deciding some "sound" better than others.
From what you say about cables then I am certain you would hear differences between each transistor.
One thing puzzles me is why you don't say much about the sounds of all the cables recorded into your sources. It must be a constant source of irritation to think that all those inferior cabvles were used on stage and at the mixing desk and recording studio. It must really gnaw away at you whilst litening to music. How do you live with it?
Stick to your day job, Alan. That is the BEST SOUNDING preamp that I have ever listened to, yes that particular unit in the picture, and I offered to directly trade it out for my own personal unit. It now resides in Singapore and wins listening comparisons over the years. By the way, we prefer air, over circuit board material, as isolation, AND the continuous back panel is there,what you see is the solid teflon isolation block for the connectors.
scott wurcer said:
Yes. They are probably a better option as they as designed for Pro-Audio kit. The Lemos are very small though so good for "minimalist" designs.
alansawyer said:
You are advised to read this thread in it's entirety. All your questions are replied along the line.
john curl said:
I have no intention of changing jobs.
John, shouting doesn't help your case that it sounds good to you. You could tell us that any old box is the best ever you have heard. Not a strong argument. (etiquette all caps is shouting).
You point about air seems to be irrelevant since you seem to have 6 circuit boards in the box.
The back panel to main case join definitely has evidence in the photo of discontinuity at the point where the back panels meets the machined sides. I can see the added teflon panel that yuo refer to, but I am talking about evidence marks at the ends of the panel.
alansawyer said:
What I intend do is connect the DAC module to different I/V modules.
First is the existing one offered by the Twisted Pear guys, based on OpAmps.
Than by a circuit based on the emulation of John Curl's design that I posted here some time ago.
Than by 2 circuits based on discreet BJTs.
Meanwhile, a proper case (that I can afford) will be designed and ordered.
Also, a remote control for switching between the DAC's inputs will be added.
But first I want to make sure that the basic configuration as offered by the Twisted Pear guys have the potential of good sound that will justify the costs and efforts in all further modifications.
I believe I'll build the circuit based on the emulation of John Curl's design anyhow, to see I can possibly build a decent pre-amp for myself. My existing pre-amp is mediocre. Concerning this circuit, I haven't decide yet how I'm going to have with it both balanced and single-ended inputs and outputs.
Joshua_G said:
You are advised to re-read my post. There is one question. In essence that was "Does anyone have any MORE information on the unit?".
If you understand what that means, then it cannot have been answered, because I am asking it at this point in time. And, I am asking it based on that I HAVE read every post (I am a sad person) and there ain't no schematic with component values in here.
Joshua if you are going to reply then at least make sure it is useful. A rapid put down is not very friendly and does you no favours.
alansawyer said:
The proof of the pudding is by eating.
You ask JC for ideas and the same time you reject those ideas.
If you think you know better, you are welcomed to go by what you know.
I wish I could afford a case like the Blowtorch's.
alansawyer said:
There are few posted schematics with values.
If you ask for the exact schematic of the Blowtorch – JC stated that he doesn't post schematics.
Joshua_G said:
I was told of 15,000 cases just like that for an Army computer. Cost of CNC metal work was approx $700 from supplier. One off was about $2000 from Pro-Eng drawings.
For High End kit it is justifieably if the customer will pay but audible? Probably about as audible as the fairies at the bottom of the garden.
Oh by the way, I didn't ask for ideas. Having read every post in this thread I wouldn't bother.
alansawyer said:
We used machined aluminum cases like that as early as 1971 for test heads. I had a femto-amp test box machined out of one block of solid Al in 1975, all the rest was solid teflon (only one survives a beauty).
Joshua_G said:
Yes I saw that post. Has anyone reverse engineered it?
If only 40 made and sold for $10,000+ then I guess not. The people who would pay that for a pre-amp wouldn't know how.
jacco vermeulen said:
That's a neat idea. Any idea of the cost of flat plate that thick?
How easy to weld?
I pay $3.5/lbs for new aluminum plate, Comp. account wholesale.
A welder will do it for less than $100.
(on the other hand, the last preamp i bought less than a year ago cost me $13.5K, used)
A welder will do it for less than $100.
(on the other hand, the last preamp i bought less than a year ago cost me $13.5K, used)
alansawyer said:
Hey, Hey, Hey,
Looks like I have company her! Another newbie with an innocent view of the world and an honest bluntness to boot!
Boy did you stumble into the wrong room, I think in your observations you managed to step on about half of everyone’s toes and with luck, most of what you posts from here on out will be seen as a challenge to discredit. I think there’s a certain entertainment factor to it.
Read a bit deeper and you'll find, through the topics that keep circling back around, that there are two camps and both tenaciously hold on to their world view with little time or mental capacity expended on anything else, especially if they didn't think of it. The topics just seem to get more refined and supported with more with ancient articles and antidotes each time they circle back around.
Don't try to hard to fit in, you can't. Be aware that their is no ability to understand sarcasm, or conceptual thought when it comes to things that can be easily discussed in mathematical terms, and for God's sake take the time to learn the language or any discussion you might actually initiate will spiral into a discussion of safety grounds.
Most of all just remember they are all smarter than you, which is what the "don't quit your day job" comment was coming from.
There are lots to learn hidden in between the lines, but that's kind of dried up here in the last while.
Good Luck,
Cheers, Mike.
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