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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 24th February 2014, 11:00 PM   #48571
RNMarsh is offline RNMarsh  United States
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let me help a little.... if I am able. The triode is - to very talented and educated man who has studied the sources of non-linearity for IBM etal... says it is the most linear. However, he, I, you and everyone else knows that it isnt perfect and he was only talking about the operation in principle. They are too noisy and other things to use everywhere. Which is why he uses fets instead..... not as linear in principle but can get better results over all.

Now the ferrous thing. In some critical places and with sufficient current flow THRU the part (series) the magnetic part will produce distortion. The level of the harmonics is way below the noise of most audio circuits using tubes. It is masked. But in some of the best low noise and ultra low distortion ss circuits, you can begin to see it intrude.... still at low levels until the currents get high.

I will leave it at that for now. Incomplete as it is.

THx-RNMarsh

Last edited by RNMarsh; 24th February 2014 at 11:12 PM.
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Old 24th February 2014, 11:30 PM   #48572
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
So you're saying that it's unimportant in preamps, power amp input, and power amp driver stages, where the currents are low?
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Old 25th February 2014, 12:31 AM   #48573
scott wurcer is offline scott wurcer  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by RNMarsh View Post

I will leave it at that for now. Incomplete as it is.

THx-RNMarsh
Ed Simon's doppleganger? Put numbers on these effects in relation to the magnetic non-linearities inherent in almost any speaker motor assembly.

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Old 25th February 2014, 12:38 AM   #48574
hitsware is offline hitsware
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> Put numbers on these effects in relation
> to the magnetic non-linearities inherent
> in almost any speaker motor assembly

Once more I must say
(In general)
Distorsion does not mask distortion !
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Old 25th February 2014, 12:43 AM   #48575
scott wurcer is offline scott wurcer  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by hitsware View Post
> Put numbers on these effects in relation
> to the magnetic non-linearities inherent
> in almost any speaker motor assembly

Once more I must say
(In general)
Distorsion does not mask distortion !
Really, -100db distortion in the presence of 1% is so obvious you would have to be deaf?
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Old 25th February 2014, 02:02 AM   #48576
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by SY View Post
So you're saying that it's unimportant in preamps, power amp input, and power amp driver stages, where the currents are low?
Thats what it looks like.... if contribution stays below -100dB... except I might not exclude the drivers to the OPS... they have to supply a few amperes sometimes (bjt).

However, you can easily remove even the high current/ferrous metal distortions into the dirt, if you choose to.

THx-RNMarsh

Last edited by RNMarsh; 25th February 2014 at 02:12 AM.
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Old 25th February 2014, 02:11 AM   #48577
RNMarsh is offline RNMarsh  United States
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SW - OMG! A speaker motor assembly?
Dont you use the (new) QUAD electrostatics? Quite a bit lower...maybe a 100 times lower than 1%.

-RNM

Last edited by RNMarsh; 25th February 2014 at 02:19 AM.
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Old 25th February 2014, 02:33 AM   #48578
hitsware is offline hitsware
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> -100db distortion in the presence of 1%
> is so obvious you would have to be deaf?

Is that how you understood my statement ?
No.
I'd venture that @~ -46db distortion starts to
be discernable through 1% distortion.
Perhaps through 5% (or more)
The fact is that ~0.5% is where amplifier distortion
becomes audible through normal speaker systems.
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Old 25th February 2014, 02:47 AM   #48579
Kindhornman is offline Kindhornman  United States
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John Curl's Blowtorch preamplifier part II
Quad electrostatics having 100th the distortion of a normal moving coil speaker I have a hard time with that? Try and make any type of lower frequencies with them and tell me that is true.
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Old 25th February 2014, 04:40 AM   #48580
PMA is offline PMA  Europe
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by scott wurcer View Post
Really, -100db distortion in the presence of 1% is so obvious you would have to be deaf?
Depends. In case of digital nastiness uncorrelated/correlated to program you will hear it even if lines (not SINGLE line) are about -90dB or less. Sounds like chirps, best heard with headphones during low level parts of music.
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