John Curl's Blowtorch preamplifier part II - Page 3464 - diyAudio
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Old 10th February 2013, 02:09 AM   #34631
qusp is offline qusp  Australia
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kgrlee: Lenehan Audio uses them I believe...

Max: John has already denied there is any kind of ferrite or inductor also didnt you see the pictures of the premium model cracked open a few pages ago, posted by John?
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Old 10th February 2013, 02:09 AM   #34632
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Max, thanks for keeping an open mind. However, they are expensive, and getting them to Australia would be a problem. They are not a fake, I have taken them apart, myself. Nobody could make what I have seen inside in their garage.
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Old 10th February 2013, 02:14 AM   #34633
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Quote:
Originally Posted by john curl View Post
Real music has a dynamic DC component just like Richard says.
If it's dynamic, it's not DC by definition.
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Old 10th February 2013, 02:15 AM   #34634
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Quote:
Max, can you tell us who this august personage is?

BTW, the test JC describes and you quote is called THD testing.
I well know what THD testing is and how it works, thank you.
IME Sinewave THD testing does not show any reliable quantifiable result when measuring system effects due to ferrite filters at audio frequencies, however real world loopback music testing does reveal effects.

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Russel Storey is 61 yo, has spent his lifetime involved in audio/video electronic repairs, retailing and manufacturing.
In our conversation he stated that he has tried just about every tweak available, in order to form his own opinions.
Five years ago he first tried the BQP's and in his words the change was 'jaw dropping'.
His opinion of many tweaks is they don't work, his strongly stated opinion of the BQP is 'they work'.

Dan.
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Old 10th February 2013, 02:20 AM   #34635
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this thread has possibilities ...
quantum theory is acknowleged ...
obviously inviting metaphsics into
the mix ....
it may be time to break ' snake oil '
down into its constituents ....
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Old 10th February 2013, 02:20 AM   #34636
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Old 10th February 2013, 02:21 AM   #34637
qusp is offline qusp  Australia
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SY: Cal did subjective testing right? he was very interested and had an open mind I believe... he didnt report any Jaw-dropping? guess his ears, music or equipment is not up to the task of discerning said jaw dropping experiences...
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Old 10th February 2013, 02:22 AM   #34638
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Default My Post Was About Ferrite...

Quote:
Originally Posted by qusp View Post
Max: John has already denied there is any kind of ferrite or inductor also didnt you see the pictures of the premium model cracked open a few pages ago, posted by John?
Perhaps you need to read my post again, and completely.....I am not suggesting that BQP contains ferrite (I already understand that it does not)....I am relating a different device that should not affect audio, but in my experience it does.

Dan.
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Old 10th February 2013, 02:22 AM   #34639
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Quote:
Originally Posted by john curl View Post
NO, when second harmonic is generated from a primary sine wave, it CREATES A DC OFFSET ..
That's the same reason one tries to minimize 2nd harmonic in tape recorder AC bias oslillator. With larg-ish amount of 2nd (=DC) the byproduct of it is very noisy and unpleasant recording.
EDIT - with different bias anf erase frequencies you almost never see 2:1or 4:1 ratios of these, mostly 3:1.

Last edited by elektroj; 10th February 2013 at 02:30 AM.
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Old 10th February 2013, 02:25 AM   #34640
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Quote:
Originally Posted by Max Headroom View Post
...a different device that should not affect audio...
Where would you get that curious (and totally incorrect) idea?
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