BAT VK30 Bride of son of zen rippoff? - diyAudio
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Old 25th January 2002, 06:07 PM   #1
hifi is offline hifi  Sweden
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Default BAT VK30 Bride of son of zen rippoff?

i just checked the topology schematic on that preamp...it is a bride of son of zen with tubes......

is it under licens or?...


/micke
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Old 25th January 2002, 06:21 PM   #2
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The BOSOZ isn't patented. It's just a nicely executed solid state differential. As such, anyone is free to build one with any sort of gain devices that come to hand.
In the meantime, have a look at some of their other schematics and see if you find anything else that looks familiar...

Grey
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Old 25th January 2002, 07:04 PM   #3
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Not only is the BSOZ not patented, it's design would
be considered a trivial example of prior art by the
patent office, as would the other Zen circuits published
to date. Almost as trivial as the stupid net business
models clogging the patent office at this time.

Victor at BAT is what we used to refer to as a gentleman
and a scholar, and if by chance he was inspired by
BSOZ, then I would be flattered.
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Old 26th January 2002, 03:09 AM   #4
hifi is offline hifi  Sweden
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ok...just thougt you ought to know....

/micke
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Old 27th January 2002, 08:34 AM   #5
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Default BAT preamps

Hello,

i´m in service for BAT since 1997 (not authorized)
and know Victor´s preamps in deatail. he always uses simple Diffamps working on current sources.
The differences are in the Tubes (6922 & 6H30P-DR)
and Fets and the current flowing.
Therefore he called his preamp philosophy "Unistage"

Reinhard
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Old 9th April 2002, 06:56 PM   #6
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where could I find schema for BAT
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Old 10th April 2002, 06:27 PM   #7
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Hello,

for schematics ask Victor Khomenko at www.balanced.com.

I would not feel comfortable to give you in house documents.

But where is the problem: Take the BOSOZ and scale it up for tubes. With + - 150 V rails and some 6922 you will get good results.

For further questions do not hesistate to contact me at: in.audio@t-online.de

Reinhard
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Old 15th April 2002, 08:14 AM   #8
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thanks a lot, I will try

Peter
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Old 26th April 2010, 08:13 PM   #9
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Quote:
Originally Posted by reinhard View Post
Hello,

i´m in service for BAT since 1997 (not authorized) and know Victor´s preamps in deatail. he always uses simple Diffamps working on current sources. The differences are in the Tubes (6922 & 6H30P-DR) and Fets and the current flowing. Therefore he called his preamp philosophy "Unistage"

Reinhard
Interesting; I've often wondered what comprised the fundamental basis for the BAT "Unistage" design. The benchmark results always indicated something a bit more sophisticated than just a high-performance SET (as in the conrad-johnson ART "composite triode" configuration). Does the BAT Unistage use solid-state or vacuum-tube current-sources for the differential pair? Also, does the BAT Unistage use cascode elements on the differential pair and/or the current-sources?
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Old 27th April 2010, 05:23 AM   #10
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Hello,

the unistage is always a differential amplifier with resistiv anode loads.

For the cathode current sources you find solid state and vacuum tube, depending on model.

have a look at their website, it is very informative.

Reinhard
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