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Old 13th June 2005, 07:46 PM   #11
mikeks is offline mikeks  United Kingdom
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Default ...and...

...more of the same...
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Old 13th June 2005, 08:52 PM   #12
Did it Himself
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Brilliant stuff. Always been intrigued what was under the lid of these amps. Looks like it lives up to the hopes!
__________________ my website for UK diy audio people - designs, PCBs, modules and more.
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Old 14th June 2005, 06:17 PM   #13
mikeks is offline mikeks  United Kingdom
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Originally posted by richie00boy
Looks like it lives up to the hopes!
Not sure i agree....different strokes for different folk i suppose....
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Old 14th June 2005, 06:29 PM   #14
Bare is offline Bare  Canada
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despite the Brochure Babble.. The Audiolabs in question were decent amps.. but not nearly as good as the Sales brochure intimated they would be... this was reflected in the Marketplace.
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Old 14th June 2005, 07:54 PM   #15
mikeks is offline mikeks  United Kingdom
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The output stage looks promising....but requires at least thre pairs of output devices....

....the rest of the design is slavishly based on Otala's philosophy...which is inherently flawed.....

For instance, there is no earthly reason why foward-path bandwidth should exceed the nominal audio bandwidth.....

Additionally, triple gain-stage designs are only useful in the context of a nested feedbak/feedfoward compensated design.....
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Old 14th June 2005, 09:16 PM   #16
GEirin is offline GEirin  Argentina
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Why the Otala's philosophy amplifier is inherently flawed...?


Guillermo Eirín
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Old 14th June 2005, 09:40 PM   #17
mikeks is offline mikeks  United Kingdom
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Thoughts Concerning Cordell, Otala, and Gilbert papers
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Old 15th June 2005, 07:05 AM   #18
AndrewT is offline AndrewT  Scotland
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I had a look at the TAG Maclaren article and compared their diagrams to the old Audiolab 8000a schematic recently posted.
Only 2 differences;- the DC servo is now non-inverting and Fet input.
Everything else appears identical.
No wonder then that Tag have decided to revert back to the Audiolab name, they appear unable to improve the design of their branded version.
I would like to see the latest generation of Audiolab amplifiers and the final generation of 8000 (M or P) series before the Tag takeover. It may give some insight into their continuing development and fine tuning.
regards Andrew T.
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Old 1st July 2005, 10:13 PM   #19
dhole is offline dhole  United Kingdom
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Hi there People

I would be very interested in any other schematics for the 8000 series. Especialy the Q as I can see there is space for balanced outputs. Perhaps a diy route........

The luminous space in the Sword of Orion...
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Old 2nd July 2005, 08:40 AM   #20
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Default Poor Mikeks, my old friend already read all electronics books

And now returning to more basic things.... well, this is good to me, to increase my knowledge, but may be very boering to you.

As you understand of natural philosophie, as Gluteus Maximus, great scientist that one, use to show us how deep is the reality Mikeks, i am sending you regards and worried about your future destiny.

Wonderfull girl in that picture, in special if you have that beauty surrounding you...must be a "conaisseur" to give the real value to that wonderfull "brownie"

ahahaha...philosophie was wonderfull!...and you and SY can capture fast that.


Sorry, Brazil only to be sold... top secret ultimate schematic, not to share...encapsulated VAS:
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