John Curl's Blowtorch preamplifier part II - Page 3615 - diyAudio
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Old 3rd March 2013, 03:14 AM   #36141
Pano is offline Pano  United States
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I haven't kept up lately, but I didn't see that, no. There is a good bit of info about what frequencies might work best, but nothing about sweeps. Unless I missed it.

Oh, BTW I was joking about the dishwasher. Just in case any of you nuts decide to try it.
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Old 3rd March 2013, 03:34 AM   #36142
bcarso is offline bcarso  United States
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Originally Posted by Pano View Post
I haven't kept up lately, but I didn't see that, no. There is a good bit of info about what frequencies might work best, but nothing about sweeps. Unless I missed it.

Oh, BTW I was joking about the dishwasher. Just in case any of you nuts decide to try it.
WHAT! I just put all my priceless d to d in there.....

The issue with variable freq ultrasound is I think that most transducers are operated close to or at mechanical resonance, so sweeping them may be something of a challenge and require very different electronics. Still in all, possible.
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Old 3rd March 2013, 03:58 AM   #36143
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I haven't read that whole thread yet but there is a section where they are talking about sweeping the frequency. The answer was that the resonance that the units cover has a band width of about 3 to 4Khz at best so varying the frequency was only a small change. The preferred minimum frequency was 60Khz and up. Rotation speed is anywhere from 1 rpm to 1rph.
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Old 3rd March 2013, 04:07 AM   #36144
RNMarsh is offline RNMarsh  United States
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That would have been Benzene or Naptha I would think.
caution is needed when using any fluids with benzene. Benzene is classified as a carcinogin.
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Old 3rd March 2013, 04:17 AM   #36145
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I wouldn't use benzene but it is in all gasoline and I think that is what they put in disposable cigarette lighters.
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Old 3rd March 2013, 04:39 AM   #36146
bcarso is offline bcarso  United States
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I wouldn't use benzene but it is in all gasoline and I think that is what they put in disposable cigarette lighters.
Usually butane or perhaps propane in lighters.
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Old 3rd March 2013, 06:13 AM   #36147
gootee is offline gootee  United States
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caution is needed when using any fluids with benzene. Benzene is classified as a carcinogin.
Wha-a?! Benzene is secretly in Casino gin??

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Old 3rd March 2013, 07:18 AM   #36148
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Oh, BTW I was joking about the dishwasher. Just in case any of you nuts decide to try it.
Slightly OT, but I have used the dishwasher to clean vintage equipement for many years with only one problem: on some vintage test equipment (Lambda power supplies of note) the process sometimes peels off the chassis paint.

But audio equipment comes out sqeaky clean and fully operational.
(I don't use any detergent, though).

jan
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Old 3rd March 2013, 08:38 AM   #36149
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Quote:
Originally Posted by Pano View Post
any of you nuts
I wasn't.

If you clamp a warped LP and spin it at high speed, it straightens out.
Spin it fast enough for some time, and residual shear stresses are a goner.
Et voilà, perfectly flat pancake.

Not for the faint of heart, but less off the rocker than sticking an LP in the microwave, or in exotic incubators as e.g. DF1/DF2.

Just in case.
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Old 3rd March 2013, 09:53 AM   #36150
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Of course, you can recognize a vinyl record. But for the rest of us, it is the sound quality that we can't get from digital, that we appreciate. We tend to ignore the minor ticks and pops.
I love the 'rest of us' while the whole world had turned to digital apart some nostalgic or old retrograde.
I'm unable to recognize a correct digital copy from ANY original (analog or numeric), while i cried each time i listened to the vinyls made from my master tapes.
The difference is so obvious than even a deaf can hear it.
I can recognize any analog copy made on tape (on the best studio mastering machines), and specially when the original source is digital (no hiss).
While all the blind test we made in recording studios between any sources and digital copy with all the people pretending something negative about a so colling 'digital sound' produced the same results: impossible to discriminate.
Of course, you can notice very little differences due to the analog parts of the two systems if they are not the same.

Now, that 'YOU' prefer the kind of sound distorted by the vinyl is 'YOUR' problem.
You can also prefer horse carts to cars.
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Last edited by Esperado; 3rd March 2013 at 10:00 AM.
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