John Curl's Blowtorch preamplifier part II

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Steve,
There will always be a market for that on a small scale, but alas I don't think many wives would go for that often anymore. It is hard enough to get to have a larger floor standing speaker let alone a console the size that I remember. The Bose nonsense has really changed the thinking out there for the masses. While I do love the look of some of the custom consoles I grew up around with Fischer and H/K amd Mac equipment I can't remember the last time I actually saw one in anyone's house. I understand you idea, I didn't forget your concept, it is just a very small market that you are looking for. I would never discourage you or anyone else with an idea, but I'm sure you know what you are up against. Good luck on the project.
 
There will always be a market for that on a small scale, but alas I don't think many wives would go for that often anymore. It is hard enough to get to have a larger floor standing speaker let alone a console the size that I remember.

Yet I can show you any number of homes with large screen TVs sitting on, or above on the wall, credenzas and other such furniture. Key word being "furniture."

Large floor standing loudspeakers on the other hand are just that, large floor standing loudspeakers. In other words, they don't look like they serve any other purpose than to be loudspeakers. There's no "furniture factor" so to speak.

The console would be sized like, built like, and look like a credenza, just as most of the classic consoles were. So basically I'm seeing your argument as "I don't think many wives would go for a credenza in their living room," which doesn't seem like much of an argument to me.

The Bose nonsense has really changed the thinking out there for the masses. While I do love the look of some of the custom consoles I grew up around with Fischer and H/K amd Mac equipment I can't remember the last time I actually saw one in anyone's house.

Well first, I'm not looking at going after the lowest common denominator that is the mass market. I'm going after what I call the broader market. Broader with respect to traditional high end market. The market that exists between the mass market and the high end market. Those who love music, appreciate high quality, have the disposable income to pay for it, but simply have no interest in what the traditional high end market is offering, even if they knew of its existence, which the vast majority don't.

And within that market, I'm looking at primarily targeting women believe it or not. And I'll just leave it at that for now. 😀

se
 
The marvellous thing is that all the music has been 'trapped', archived - it only needs the right mechanism to unleash it, at the moment it's again a bit like the 60's when the vast majority of LP playback was relatively crude, only a vague imitation of what was captured could be recovered by much of the gear that was generally available ...

Uh no. How can you compare the 60's vinyl and the horrid cheap playback systems of that time with today's digital playback? My Sansa Clip and inexpensive JVC Marshmallows would put all of that to shame. The right mechanism in your case is that brain of yours that keeps insisting that by tweaking the crap out of anything you own is going to improve the playback, which it isn't. Tweaking only works when there are measurable results not some misguided "oh it sounds much better now" subjective hoo haa.
 
This is how it looks inside.
One last thing before i go to bed.
It is the size and the shape of the soundstage ( i can hear things OVER my head and 30 m DEEP, away from me ( tiny but focussed ) ), it sounds very wide but still focussed. It is BIG but SMALL the same time.
And the liquidity and airynesss that makes the Blowtorch so " exceptional ".
I am not the judge. The effect is undouptless real though.
It may even not be the circuitry but execution. Grounding, shielding and such.
It´s adictive when you have a sensor for that particalar drug.
Do you really think that an Opamp stage for 10,- $ can do it ?
Dream on. AND IT HAS NOTHING TO DO WITH THE DISTORTION MEASUREMENTS.
I can not measure distortion in an LME49710 when the gain is less then x 7.
Even with my new jig. That red hering is from the table.
Why such a stage sounds like a joke compared to the Blowtorch in my system is an enigma at best. I would say that the information on the recording is masked and needs "unmasking". That is much harder then copy and amplify the input. Try to compete with the giants.
It is OUR GAME and not yours.

Liquidity and airyness ......so it makes things sound wet and dry 😉

A $10 opamp, what about a $4.99 opamp or even a $2.99 one? How about a $40 opamp would that be even "better"?

Unmasked? Didn't the recording engineer do that with his cheap opamps in the recording console and using the JBL/whatever monitors for playback?🙄
If a component makes the sound different then it is measurable. Try harder.

My old Carver receiver with it's Hologram circuitry makes playback more fun to listen too. Is it "accurate" to what the recording engineer intended? No way but I like it. It "unmasks" nothing yet I enjoy what it does. Perhaps the Blowtorch does the same for you but I wouldn't call it "accurate" It's all subjective enjoyment and nothing more.
 
The right mechanism in your case is that brain of yours that keeps insisting that by tweaking the crap out of anything you own is going to improve the playback, which it isn't. Tweaking only works when there are measurable results not some misguided "oh it sounds much better now" subjective hoo haa.
It all depends on what irritates one - in my case it's low level distortion and interference, which is something that nearly always is not measured; if lack of deep bass, or imperfect frequency response, or vinyl crackle and pop are what disturb the listener then they probably wouldn't be interested in the results I'm after. The only finally important "measuring" is that done by the brain, it decides on whether the playback is worthwhile or not.
 
Sneak peek of the CTC Blowtorch with Vendetta.

I am sorry but I am not impressed, as there are many violations of proper HF design. My comments in yellow characters.
 

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A reminder of design differences. These are two different phono designs that do almost exactly the same thing, but one is discrete, the other IC. The discrete unit is about 6dB quieter. They sound somewhat different too, even though they may use the same EQ caps and resistors.

I'm not surprised, was the IC layout an DIY layout. its far from optimal, it hasn't got any planes just disjointed copper pours connected by narrow high impedance paths, just from a basic EMC point of view its dodgy.
 
I am sorry but I am not impressed, as there are many violations of proper HF design. My comments in yellow characters.

I knew you were going to say that! 😉

But it was a different time back then :geezer: ... to put a positive spin on your comments, what would be your suggestions to bring the Blowtorch up to more modern RFI/EMI standards? :up:

Tight twist with gnd wire for all internal wires (or shielded?), box grounded how?, RCAs grounded (to where?), RFI filters (res in series, cap to gnd) on all inputs, etc ... :scratch2:

PS If you use yellow text, use one with a black border: "... wires and ??? are ..."
 
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My old Carver receiver with it's Hologram circuitry makes playback more fun to listen too. Is it "accurate" to what the recording engineer intended? No way but I like it. It "unmasks" nothing yet I enjoy what it does. Perhaps the Blowtorch does the same for you but I wouldn't call it "accurate" It's all subjective enjoyment and nothing more.

Now that's what I call a guilty pleasure. 😀
 
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