Citation 12 Schematic

mereilly · 6th February 2010, 02:13 AM

Anyone with a schematic for the 12 . Thanks

llwhtt · 6th February 2010, 02:43 AM

Go to PassDIY, articles, 1981 and there is a schematic of the stock amp and one for MOSFET mod. from the Audio Amateur magazine. Good reading on how to bias an amplifier too.

Craig

mereilly · 6th February 2010, 02:50 AM

Thanks man , I am itching to get this started.

tiefbassuebertr · 8th February 2010, 02:06 PM

sometimes denied google the access
here the PDF article from Audio Amateur:
http://cygnus.ipal.org/mirror/www.pa...s/citation.pdf

mereilly · 8th February 2010, 03:21 PM

Thanks. All I have to do is do it. Thanks again. I will post progress of the project.
Mike

jeepy · 27th May 2010, 10:40 AM

Hello,
I cannot find the components to upgrade a HK Citation 12 to the Nelson Pass version. Do you ave any idea?
Thanks,
Jean-Paul

tiefbassuebertr · 11:40 AM

check out this thread:
Crazy Clipping Behavior Quasi Complementary MOSFET Citation 12 TAA Book
You need the related edition of the Audio Amateur Version or the book (right hand) about
BKAA40 - Audio Amateur Power Amp Projects
Here additional URL
HK Citation 12 Bi70mk2 Retrofit; Altec 617-8A by Mark Nash
Welkom op Audiopaul.nl! - De audiofiele website met setbeschrijving, muziek, reviews en meer.
AVForum.hu -> Harman/Kardon Citation Twelve (12)

jeepy · 27th May 2010, 11:49 AM

Thank you. I will definitely order the book and read all posts in detail. However I could hardly find some IRF 130 for sale but no MPS L01 and MPS L51 transistors and I have no idea concerning the best equivalent parts for the Nelson Pass design! I am switching back from tube amps to transistors after more than25 years so I have to start almost from scratch!
Jean-Paul/Switzerland

Nelson Pass · 27th May 2010, 03:49 PM

At both Pass Laboratories and FIRST WATT HOME you can find
the original piece, and also a parts substitution article for it.

tiefbassuebertr · 27th May 2010, 03:51 PM

Quote:

Originally Posted by jeepy

Thank you. I will definitely order the book and read all posts in detail. However I could hardly find some IRF 130 for sale but no MPS L01 and MPS L51 transistors and I have no idea concerning the best equivalent parts for the Nelson Pass design! I am switching back from tube amps to transistors after more than25 years so I have to start almost from scratch!
Jean-Paul/Switzerland

actually you must find successors here:
Small Signal Transistor - Fairchild Semiconductor Site Search
At best you contact Fairchild and ask for successors. Sometimes the same internal structur from the old models is inside in SMD outline but completly other model number ("PZT" instead "2N" e. g. or completly other). Concerning the IRF130 ask International Rectifier. Semelab still offer successors to the old TO-3 ones as I know - check out the site of
TT electronics Semelab - Discrete Semiconductor Design, Packaging, Testing & Supply
Semelab - Mil/Aerospace Division - FETS, JFETs & IGBTs

6th February 2010, 02:13 AM	#1
mereilly diyAudio Member Join Date: Apr 2009	Citation 12 Schematic Anyone with a schematic for the 12 . Thanks

8th February 2010, 03:21 PM	#5
mereilly diyAudio Member Join Date: Apr 2009	Citation 12 Thanks. All I have to do is do it. Thanks again. I will post progress of the project. Mike

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6th February 2010, 02:43 AM	#2
llwhtt diyAudio Member Join Date: Jun 2008	Go to PassDIY, articles, 1981 and there is a schematic of the stock amp and one for MOSFET mod. from the Audio Amateur magazine. Good reading on how to bias an amplifier too. Craig

6th February 2010, 02:50 AM	#3
mereilly diyAudio Member Join Date: Apr 2009	Thanks man , I am itching to get this started.

8th February 2010, 02:06 PM	#4
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	sometimes denied google the access here the PDF article from Audio Amateur: http://cygnus.ipal.org/mirror/www.pa...s/citation.pdf

27th May 2010, 10:40 AM	#6
jeepy diyAudio Member Join Date: Feb 2010	Hello, I cannot find the components to upgrade a HK Citation 12 to the Nelson Pass version. Do you ave any idea? Thanks, Jean-Paul

27th May 2010, 11:49 AM	#8
jeepy diyAudio Member Join Date: Feb 2010	Thank you. I will definitely order the book and read all posts in detail. However I could hardly find some IRF 130 for sale but no MPS L01 and MPS L51 transistors and I have no idea concerning the best equivalent parts for the Nelson Pass design! I am switching back from tube amps to transistors after more than25 years so I have to start almost from scratch! Jean-Paul/Switzerland

27th May 2010, 03:49 PM	#9
Nelson Pass The one and only Join Date: Mar 2001	At both Pass Laboratories and FIRST WATT HOME you can find the original piece, and also a parts substitution article for it.

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