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Old 3rd September 2012, 02:54 PM   #27171
SY is offline SY  United States
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Quote:
Originally Posted by aeronautical View Post

can we build a preamp now?
Yes, once you specify exactly in electrical terms what it has to do and not do.
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Old 3rd September 2012, 03:09 PM   #27172
bcarso is offline bcarso  United States
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Originally Posted by scott wurcer View Post
Lucifer is the greatest mystery of symbolism. The secret knowledge of the Rosicrucians concerning Lucifer is nowhere so plainly set forth as in these plates, which virtually reveal his true identity, a carefully guarded secret about which little has been written. Lucifer is represented by the number 741."
That number is derived from the simple cyclical mapping of the standard alphabet. Many insist the Chaldean correspondence works a lot better

But it is much harder to remember.

EDIT: With the Chaldean correspondence and following the curious supposedly Rosicrucian methodology from Wave's quote, repeated here:

"Lucifer has nothing to do with the Devil or anything evil and demonic. THis is what Christianity wants us to believe. Lucifer, is the Light Bringer/Light Bearer. Lucifer is also represented by the planet Venus…the “Morning Star”. Moreover, Lucifer has nothing to do with the number 666…Lucifer is represented by the number 741, in numerology(according the ancient Rosicrucians).

Lucifer = L(12) + U(21) + C(3) + I(9) + F(6) + E(5) + R(18) = 74

The sum of all the individual digits add to 38. All the numbers 1 through 38 when added together = 741.
-yourmajesty"

...the number is 406

Last edited by bcarso; 3rd September 2012 at 03:21 PM. Reason: more material
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Old 3rd September 2012, 03:19 PM   #27173
Pano is offline Pano  United States
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Originally Posted by SY View Post
Most of the people who solved this stuff are dead, so have difficulty accessing their accounts.
No difficulty. They just read - but never post. Lurkers, all.
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Old 3rd September 2012, 03:21 PM   #27174
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In the end audio is like fashion design. No matter how great and perfect it turns out someone will tire of it and try something new. Even if the "new" is tattered rags. In my world all audio except the technology the begot the RCA Living Stereo would be illegal. That is considered by many as a pinnacle. Would you like to live in that world? No matter how good it is in recording quality it would get boring. There are basics that have been spelled out in the early part of part 1 of this thread. Digest them and make an evolved Blowtorch.
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Old 3rd September 2012, 03:24 PM   #27175
bcarso is offline bcarso  United States
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I may have related the story about JBL Professional getting feedback from the heartland that they would have to change the model number of a new power amp if they expected to sell it. The old number was SR6660. It was duly changed to SR6670.
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Old 3rd September 2012, 03:28 PM   #27176
bcarso is offline bcarso  United States
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Originally Posted by morinix View Post
In the end audio is like fashion design. No matter how great and perfect it turns out someone will tire of it and try something new. Even if the "new" is tattered rags. In my world all audio except the technology the begot the RCA Living Stereo would be illegal. That is considered by many as a pinnacle. Would you like to live in that world? No matter how good it is in recording quality it would get boring. There are basics that have been spelled out in the early part of part 1 of this thread. Digest them and make an evolved Blowtorch.
Groner just made that point to me about a Halcro preamp, in response to my speculation about who, in a commercial product, might have deployed synthetic low-noise input terminations for cartridge damping. There must be new fashions periodically or the market loses interest.
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Old 3rd September 2012, 03:38 PM   #27177
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Yep.
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Old 3rd September 2012, 03:43 PM   #27178
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Quote:
Originally Posted by Wavebourn View Post
But anyway, I really don't understand how somebody can "hear" line level preamp. For example, any recording console have several of them, one by one in the chain, in addition to microphone preamps, summing amps, output amps, and other things like EQs that can be bypassed by switches. If they are "heard" they should be horrible.
Anatoliy, I am a bit surprised. The fact is that there are clearly audible differences in sound of preamplifiers that have distortion even below 0.001%. The difference of preamp's sound is similar to the difference between power amplifiers. Regardless the fact there were 20 opamps in the recording chain during recording session. Please try to make thorough listening tests and you should come to the similar conclusion.
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Old 3rd September 2012, 04:12 PM   #27179
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Originally Posted by SY View Post
Yes, once you specify exactly in electrical terms what it has to do and not do.
Deal!

Here's what I have in mind: I am hoping to build four systems all the way from preamp to speakers. I can't with any degree sanity commit to that just yet but as the late Steven Covey always said..."begin with the end in mind."

Why four, I have three grown kids who I think would get a kick out of having something nice that was crafted by Dad...me. Again, I can't commit to that fully just yet but I do want to start and see how far toward that goal I can get. Oh, yes, one of the systems is a prototype to develop the other three that ole dad will keep.

Actually, I started out to work backwards, starting at the speakers. Pano, don't go anywhere, I will be calling on you when I get to that point (he had given me some advice early on).

Now for the design. This isn't necassarily a project to save costs so I want to use the best components available within reason; we all know there are rapidly diminishing returns beyond a certain point - good sense should rule here.

The preamp should be very low noise. I would like to explore internal sub-compartmets to isolate various modules. I see many designs that don't do this and end up with everything from switching noise to PS hum to crosstalk. I'm not trying to set myself up in the league of you guys by any measure but it occurs to me that a great electical design can be dimished by a poor mechanical design.

I don't care about tone controls, if they could be there for the sake of my kids that would be ok if they could be defeated and in the process have no impact on sound. Personally, I don't need or want them. If you ever came into my world of many sound gadgets you would find everything set to flat that has tone controls.

I would like to have the ability to switch between sources.

balanced inputs and outputs

Since the name of this thread is John Curl's Blowtorch Preamlifier, that might be a good place to start. I get the vibe from Mr Curl that he is more than a little annoyed by being beat up by detractors on this thread. His input would be much appreciated but he may be unwilling considering. His designs are well respected and well reviewed from what I have been able to glean. Some have suggested that because other designs were also well reviewed, that are probably not as good, that the validity of the reviewer is in question. To me, that is like throwing the baby out with the bath water. I am sure I am a touch idealistic, but wouldn't it be nice if a man's work could be recognized, appreciated, and honored, without him feeling like that a bunch of punk kids are working him over. Mr Curl, if you are listening Sir, remember that Will Rogers didn't have the good fortune of making the acquaintence of everyone, and in particular, some on this thread.

Back to my preamp,

in summary, good parts, good design, well executed.

Is that a good start?

Mike
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Old 3rd September 2012, 04:25 PM   #27180
SY is offline SY  United States
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That's a nice marketing brief, but my question was "specify exactly in electrical terms what it has to do and not do." You need an electrical target for designing electrical equipment. If you're more interested in the marketing gloss, that's beyond my abilities.
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