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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

ultra low dist pre Sandman distortion null
ultra low dist pre Sandman distortion null
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Old 11th April 2014, 06:15 AM   #1
padamiecki is offline padamiecki  Poland
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Default ultra low dist pre Sandman distortion null

Hi
Reading Tube Cad Journal by Mr. Broskie I found this circuitry.
You can try any opamp in this configuration.
At 10Vpp at the output @10kOhm thd is<0,001%.
Reading the schematic watch label net “In” connection.
cheers
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Old 11th April 2014, 01:28 PM   #2
chip2000 is offline chip2000  Ukraine
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anyone tested this shematic?
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Old 13th April 2014, 05:09 AM   #3
dchisholm is offline dchisholm  United States
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What is the purpose of this circuit?

The atch LTSpice circuit file modifies some of the directives in the Original Poster's file and runs faster. Read the comments in the circuit file to understand my changes.

Dale
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Old 14th April 2014, 08:07 AM   #4
padamiecki is offline padamiecki  Poland
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Originally Posted by dchisholm View Post
What is the purpose of this circuit?
analog line level pre?
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Old 22nd April 2014, 09:50 AM   #5
padamiecki is offline padamiecki  Poland
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do you want to get power amp with similar low distortion?
better get read: "More Thoughts on the Sandman Distortion Null Topology" from OTL Design & Sandman Error-take-off Amplifier
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Old 22nd April 2014, 10:14 AM   #6
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
analog line level pre?
It makes (a little) sense for a power amplifier where the load is floating, but for a preamp or anything line-level, it is unusable unless one adds a transformer which would kill any benefit gained with this scheme
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Old 22nd April 2014, 10:31 AM   #7
padamiecki is offline padamiecki  Poland
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It makes (a little) sense for a power amplifier
why only a little?

Quote:
Originally Posted by Elvee View Post
it is unusable unless one adds a transformer which would kill any benefit gained with this scheme
how about his solution when output is isolated with the capacitors?
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Old 22nd April 2014, 12:37 PM   #8
wintermute is offline wintermute  Australia
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ultra low dist pre Sandman distortion null
Dale, options ptrantau and changing to gear are useful when there are problems with convergence with a particular circuit. If the circuit converges without problems then yes, probably best to leave them off.

I've only ever used ptrantau with very small numbers (there seems to be a sweet spot with problem circuits), I've never tried turning it off completely...

Tony.
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Old 22nd April 2014, 03:24 PM   #9
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
why only a little?
Because building a complete second amplifier just for the purpose of improving the first one is probably a waste of resources: with twice the original investment, you'd be able to build a much better amp to begin with, perhaps better by itself than a tandem of lesser quality amplifiers.



Quote:
how about his solution when output is isolated with the capacitors?
This doesn't change the fact that this cannot work in a purely unbalanced configuration
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Old 23rd April 2014, 07:20 AM   #10
padamiecki is offline padamiecki  Poland
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Because building a complete second amplifier just for the purpose of improving the first one is probably a waste of resources: with twice the original investment, you'd be able to build a much better amp to begin with, perhaps better by itself than a tandem of lesser quality amplifiers.
Dear Elvee
I did not check
but I have got a "feeling" that from two superior dirt cheap LM3886 plus a few extra parts you can squize >>ten times better performance than one single LM.
Is it worth? I cannot check now.
but this is about poweramp... not fit to this thread
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