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Old 2nd June 2010, 05:57 AM   #31
Ludwik is offline Ludwik  Poland
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I'm interested in KSA-5 circuit diagram, too.
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Old 2nd June 2010, 06:44 AM   #32
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Quote:
Originally Posted by wayne View Post
I have a schematic for the KSA-5. Any interest?
post it
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Old 2nd June 2010, 07:01 AM   #33
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also interested.....
thnx
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Old 2nd June 2010, 08:08 AM   #34
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by wayne View Post
I have a schematic for the KSA-5. Any interest?
bloody teaser ;

learnin from Papa ?



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Old 2nd June 2010, 12:06 PM   #35
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Old 2nd June 2010, 06:31 PM   #36
wayne is offline wayne  United States
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Default Ksa 5

I am out of the office but will post in the next day or two.
FYI the To-5 is a dual FET and the op-27 is used as a servo.
This is from about 1991 - 1994. It was done by Todd Eichenbaum if I guess correctly. He is now head of engineering at Krell. A fine engineer and a helluva a nice guy.

I reverse engineered it off of a unit I repaired. Cat hair and pee will screw up a servos operation.
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Old 2nd June 2010, 07:57 PM   #37
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........

I reverse engineered it off of a unit I repaired. Cat hair and pee will screw up a servos operation.
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Old 3rd June 2010, 07:07 PM   #38
wayne is offline wayne  United States
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Default KSA 5 Schematic

Here is the schematic. This is most of it. Not shown is bias or servo circuit.
Power supply is an R core in an external box OP27 a reference and pass transistors. + - 22 Volts
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File Type: pdf KRELL_HEADPHONE.pdf (31.4 KB, 503 views)
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Old 4th June 2010, 12:47 AM   #39
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Thank you for you effort, but CCS for input differential is missing as well as type of output transistors. I guess a DC servo circuit would be of interest for many of us, if it's not plane-Jane-insert-current-at-inverting-input.
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Old 4th June 2010, 01:25 AM   #40
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Thank you for you effort, but CCS for input differential is missing as well as type of output transistors.
I see the pair of CCS for the inputs (which are followers) as
well as the numbers of the output devices.

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