Strange Features by the MC Head Amp Circuit of Linn's LK-1 (LK1) - diyAudio
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Old 31st August 2012, 04:38 PM   #1
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Location: D-55629 Schwarzerden
Default Strange Features by the MC Head Amp Circuit of Linn's LK-1 (LK1)

This amp stage consists of a differential cascode and instead the usual current source of the LTP there are two independend CCS. This means, one can adjust the open-loop gain by variation of the value from R6.
The question for me is which job does the jumper with ferrite beads like
(on Main PCB called "LK1" = link1), solder in parallel mode to R6 ??
In the attached picture you will find the Tantal C2 between the phono input RCA sockets. "LK1" with ferrite beads and "R6" (3R3) you will find in the right of C2.

And some more questions:
Linn don't prefer a dc coupled mode. The choice of the capacitor in the signal pad (and NFB) are 100uF tantal in parallel mode with a 22uF tantal.
1) Are there a special benefit for this kind of parallel mode?
2) By which guidelines was fixed the polarity ??
3) How is to determine the voltage gain factor of this stage?
4) There are a ferrite bead on each base leg from Q3 and Q4 (2x CCS). Why?

P. S. Linn's LINTO (first series) uses the same circuit topology (some versions without the ferrite bead).
Attached Images
File Type: jpg LK1 PCB component view jpg.jpg (327.1 KB, 170 views)
Attached Files
File Type: pdf Linn LK-1 MC Head Amp Left.pdf (45.0 KB, 77 views)

Last edited by tiefbassuebertr; 31st August 2012 at 05:01 PM.
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Old 7th September 2012, 09:09 AM   #2
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no informations?
the genuine circuit is here:
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Old 13th September 2012, 11:26 AM   #3
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I'm also highly interested in any information about the LK1.
I did some mods on the LK1 more than 10 years ago and hope to find some pics of these.
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Old 14th July 2013, 08:47 PM   #4
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Anything you'd highly recommend to change on the line and output stages?
Blaue Leuchtdioden machen blöd. (hb)
quod licet iovi, non licet bovi
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