John Curl's Blowtorch preamplifier

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#16,622
April fools' joke?

Hi Stuart,

I'm afraid that this latest experiment is just as flawed as the original experiments by F&P. What they have measured is a tiny bit of excess heat by means of a calorimeter. It's true, you can measure the produced heat from particles (neutrons, gammas etc.). But in this case it's pointless, as a calorimeter doesn't know the origin of the heat. The key question is: are neutrons or gammas generated. To answer that question you need apparatus that selectively detect neutrons or gammas, instead some heat, which might come from anywhere.
The only thing this latest experiment 'confirms' is that the original setup by F&P proofs nothing.

Regards,
Edmond.
 
#16,623
Edmond, they're claiming to measure neutrons, but from the sketchy description (I'll see the actual paper this weekend), it looks like one of those Langmuir pathological things, edge of detectability. Who knows, maybe it's solid, but that's not where I'm putting my bets.

Allen, you have my point entirely. If the object is "the best possible" as opposed to "the best possible using only silicon," there are much better ways to skin the cat. But really, you ought to get a 24 bit card...
 
#16,625
I lived almost completely with tubes for the first 10 years of my excessive interest in hi fi design. I still own Dyna, Heathkit (Williamson), etc power amps,
However, I stick to solid state design as I am best at it, compared to tube design.
Audiowolf would run circles around most of you in tube design. Just talked to Audiowolf today.
 
#16,633

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#16,634
scott wurcer said:


The original designer was a customer and used a now obsolete analog multiplier in his servo. That was 25yr. ago, this thing just won't go away. From what I hear the dust refectivity issue is nearly fatal in practice.
Click to expand...

I have friend who bought one. He was in love with it for about 4 months. Then its inability to track inner grooves finally drove him to selling it. I would love to play with one, I think it would be a great device for 1/2 speed digital transfers and reclaiming old recordings. Its actually too cheap for today's high end market. However way too expensive for me to play with.
 
#16,635
John,

if overall complexity is a problem for you (for whatever reason), did you ever consider (very high quality) AC coupling caps in the signal chain and a single ended balanced open loop approach (with the same or better THD performance, especially regarding K3++), instead of using a DC coupled fully complementary open loop design with servos ?

For me this would sound like a feasible approach, especially since this complementary matching and servo thing could be completely avoided.
 
#16,637
I wrote:
"Ok Teach, I have a question. On the one hand you seem to be complimenting the complementary i/p LTPs on the basis that THD is halved. On the other hand, your lowest THD has been achieved with a single i/p LTP. But you continue to use the complementary i/p.
Isn't that inconsistent with you goal?
How do you justify that?"

It is a serious question.
 
#16,640
1audio said:


I have friend who bought one. He was in love with it for about 4 months. Then its inability to track inner grooves finally drove him to selling it. I would love to play with one, I think it would be a great device for 1/2 speed digital transfers and reclaiming old recordings. Its actually too cheap for today's high end market. However way too expensive for me to play with.
Click to expand...

I also was told they are great for walking up the side walls of old 78 grooves and finding a quieter zone.

Too cheap! Don't say that around here, it will start another firestorm.
 
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