Strange Features by the MC Head Amp Circuit of Linn's LK-1 (LK1) - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 31st August 2012, 04:38 PM   #1
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
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
http://www.wb5rvz.com/sdr/genesis_g4...rrite_bead.gif
or
http://www.token.com.tw/inductor/ima...filters-fb.jpg
(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, 169 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.
  Reply With Quote
Old 7th September 2012, 09:09 AM   #2
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
no informations?
the genuine circuit is here:
http://diagramas.diagramasde.com/audio/Linn%20LK1.pdf
  Reply With Quote
Old 13th September 2012, 11:26 AM   #3
diyAudio Member
 
ticktock's Avatar
 
Join Date: Dec 2006
Location: Old Anglia
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.
  Reply With Quote
Old 14th July 2013, 08:47 PM   #4
diyAudio Member
 
ticktock's Avatar
 
Join Date: Dec 2006
Location: Old Anglia
Anything you'd highly recommend to change on the line and output stages?
__________________
thank you papa !!
Blaue Leuchtdioden machen blöd. (hb)
quod licet iovi, non licet bovi
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What features would you like in a head unit that doesn't exist yet? JZatopa Car Audio 18 15th March 2011 06:18 PM
Linn LK1 LK 1 Record - and Source-Indicator LED's wanted tiefbassuebertr Solid State 0 5th April 2010 05:47 PM
Zobel filter for MC head amp? duderduderini Analogue Source 3 15th December 2008 09:31 PM
MC head amp rdr Analog Line Level 29 27th December 2006 09:21 PM
Low noise head amp (MC) Jorge Analogue Source 11 19th August 2005 02:14 AM


New To Site? Need Help?

All times are GMT. The time now is 11:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2