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Old 29th December 2007, 01:37 PM   #1
GEirin is offline GEirin  Argentina
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Default Kulish Corrector applications

Hi all.

I have tried the Mikhail Kulish error corrector schematic from other diyAudio threads. What is you opinion?

Schematic attached below is a pre amplifier circuit idea, diff+ VAS.

GEirin
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Old 29th December 2007, 01:40 PM   #2
GEirin is offline GEirin  Argentina
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Other application.

Schematic attached below is a amplifier circuit idea, lin topology Diff+VAS+EF.

GEirin
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Old 29th December 2007, 09:18 PM   #3
GEirin is offline GEirin  Argentina
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Hi all.

Other application.

Schematic attached below is a JLH (1972) amplifier mod, witch Kulish error correction in VAS.

Opinions?

GEirin
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Old 29th December 2007, 09:32 PM   #4
KSTR is offline KSTR  Germany
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Quote:
Originally posted by GEirin
Opinions?
Go simulate and look what it does (or what it does not).

- Klaus
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Old 29th December 2007, 11:28 PM   #5
GEirin is offline GEirin  Argentina
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Hi KSTR.

Thanks you very much for you reply and help. I not an expert in amplifier, audio is my hobby.

regards
Guillermo
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Old 30th December 2007, 12:22 AM   #6
KSTR is offline KSTR  Germany
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Hi Guillermo,

no soy un experto tampoco...

A problem with the Kulish stage (as far as I found in my little investigation so far) is that it seems to need a high supply voltage, at least if one wants to make use of the most linear part of the transfer function which is at the lower end of output voltage (see my post in LXG's Kulish thread). This might complicate its use as a VAS, like in your first ciruit.

While in general these ideas look promising one still needs to elaborate on them in depth to see if the advantages really win over the disadvantages...

Klaus
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Old 30th December 2007, 12:45 AM   #7
GEirin is offline GEirin  Argentina
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Ok. Klaus.

¿Tu hablas español?.

Muchas gracias y espero tu simulación.

Yes advantages vs. disadvantages.

Guillermo.
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Old 30th December 2007, 08:01 AM   #8
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It has certain advantages if your topology allows you to keep the inner collector swings limited, and keep both transistors comfortably biased in a linear region with a reasonable amount of Vce (more than a few volts). For a classic VAS, with large collector rail-to-rail voltage swings, this can be difficult, unless a additional pair of higher voltage rails are employed. My suggestion is to leave the VAS as a single-ended or cascoded BJT, and think about an LTP instead.

I haven't looked at the LTP biasing in detail yet. It should be possible to develop a Kulish LTP that is in effect a JFET replacement, and even more linear and more flexible wrt to transconductance adjustments, etc.
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Old 30th December 2007, 08:12 AM   #9
AKSA is offline AKSA  Australia
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Hi Guillermo,

Did you ever build your last design?

That was a nice amp, you should build and listen to it, it will definitely surprise you.....

I mention this because you are falling into the same trap which gets me every time; moving from one idea to the next without fully investigating the last (good) idea......

Cheers,

Hugh
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Old 30th December 2007, 09:30 AM   #10
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Quote:
Originally posted by KSTR
tampoco
Klaus,

sin embargo, un "Kraut" listo con humor es buena lectura.
(como la idea fresca de un servo en Class A, por ejemplo)

Mr Dean,

best NY's wishes to the Victorians who are speeding 10 hours ahead to the calendar change.
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