John Curl's Blowtorch preamplifier part II - Page 949 - diyAudio
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Old 5th February 2011, 12:13 AM   #9481
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Originally Posted by john curl View Post
Now, you junior engineers out there, you might scope out the size, power rating, etc. of the resistor, no surplus parts in this example, please. Jack has not used surplus resistors for at least a decade, in this product, and they were .25-.3 ohms in value.
I'm not exactly junior, but I managed to find identically performing resistors (albeit without magnetic leads!) for 50 cents in onsey-twoseys. Not surplus, Digikey. Power rating is easy- 30 milliohms at the rated 4 amp max corresponds to less than 1/2 watt.
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Old 5th February 2011, 12:22 AM   #9482
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The power RATING printed on the resistor is 25W.
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Old 5th February 2011, 12:34 AM   #9483
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I am not kidding.

Take the optical assembly out of a DVD player and notice all the beam splitters, lenses, motors, coil actuators, lasers, etc. and then think about how they make a $29.95 DVD player.
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Old 5th February 2011, 12:40 AM   #9484
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$15 (99RMB) over here.
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Old 5th February 2011, 12:58 AM   #9485
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I am not kidding.
magicJack

Neither is he.
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Old 5th February 2011, 01:51 AM   #9486
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Take the optical assembly out of a DVD player and notice all the beam splitters, lenses, motors, coil actuators, lasers, etc. and then think about how they make a $29.95 DVD player.
Easy. Chinese labor at 50 cents a day!

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Old 5th February 2011, 02:05 AM   #9487
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Easy. Chinese labor at 50 cents a day!

se
That's part of it, there was a debate several years ago about the little trim pot that adjusts for the laser sensitivity. A person actually adjusts it (at a cost of pennies) and the equipment to automate that was very expensive.
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Old 5th February 2011, 03:49 AM   #9488
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That's part of it, there was a debate several years ago about the little trim pot that adjusts for the laser sensitivity. A person actually adjusts it (at a cost of pennies) and the equipment to automate that was very expensive.
Yup.

And there's also... How'd David Letterman used to put it?

VOLUME! VOLUME! VOLUME!



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Old 5th February 2011, 11:54 AM   #9489
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Now, you junior engineers out there, you might scope out the size, power rating, etc. of the resistor, no surplus parts in this example, please.
Now all you junior electronics engineers out there, if they manufactured television sets the way high end audio equipment manufacturers manufacture their products you'd have to take a second mortgage out on your house to buy one. They could hardly be less cost effective if they tried. This alone is reason to reject them especially considering that when viewed objectively by people who are not passionate but practical, they offer only marginal advantages at best over much cheaper alternatives....or that you could build them or their equivalents for a small fraction of what they sell for retail.
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Old 5th February 2011, 01:11 PM   #9490
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Soundminded, this is where you go astray. Jack could use a cheaper resistor, BUT it would not work as well for what he is doing, compared to what he is using. WHAT I am trying to point out is that the ONLY resistor ever shown, by a third party, to be in a Bybee Purifier is: Impossible to purchase, has an amazing power rating, and is well made.
This contradicts the presumption that ANY resistor could be easily used, just as effectively.
Now THIS resistor is used in the LARGER Bybee Purifier, NOT the smaller one, looked over, (not into) by people here. It has a HIGHER current rating, and therefore needs a resistor with a HIGHER power rating, in fact at least 5W. Check it out.
Now, the unit purchased by the moderators here, has NO obvious resistor. It MEASURES like a resistor, but it is NOT a resistor that you can buy, or easily copy. It's not cheap either. However this is all academic, because all of you are convinced that this is impossible, and the device must be whatever YOU THINK it is, so I will stop now.
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