Citation I and IV phono schematic query - diyAudio
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Old 19th May 2012, 08:19 PM   #1
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Default Citation I and IV phono schematic query

Schematics for these can be seen here:

http://tech.groups.yahoo.com/group/citationsound/files/

Thank you to PCWolfe for posting these!

Please help if you can:

I am trying to understand the schematic of the Citation I phono section (V1 and
V2) but I am confused by the switching.

The turnover and rolloff switches list 6 positions, but the rolloff switch
positions in the schematic are numbered 1 through 5 plus 7. The Turnover switch
positions are numbered 1 through 7 and 9 and 10.

When the preamp is in the RIAA mode, can someone tell me please which capacitors
and resistors are selected?

On the Citation IV, the function switch has 6 positions but the switch
positions in the schematic are numbered 1 through 6, then 9, 12 and 13.

When the preamp is in the RIAA mode, can someone tell me please which capacitors
and resistors are selected?

I'm sure this follows some convention but I don't know the secret. Your
assistance is much appreciated. I see similar similar diagrams on the Dynaco
PAS schematic but they seem more understandable.

Thanks!
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Old 20th May 2012, 09:21 PM   #2
kevinkr is offline kevinkr  United States
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Those schematics are not available to those who are not members of citationsound.. I've got a yahoo account and that is what I was greeted with.

I would look around for a schematic that you can post here, or post a partial schematic including the details of the phono stage.
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Old 20th May 2012, 11:31 PM   #3
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Google is our friend:
http://www.triodeel.com/cit1phon.gif
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Old 20th May 2012, 11:33 PM   #4
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and Citation IV phono:
http://www.triodeel.com/cit4pho.gif
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Old 21st May 2012, 03:29 AM   #5
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Schematic of Citation 1 with better resolution.

Click the image to open in full size.


A modified Citation IV circuit by Jim Fosgate from Sound Practices.

Click the image to open in full size.

Last edited by directdriver; 21st May 2012 at 03:45 AM.
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Old 23rd May 2012, 02:58 AM   #6
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Quote:
Originally Posted by hifigeezer View Post
Schematics for these can be seen here:

http://tech.groups.yahoo.com/group/citationsound/files/

Thank you to PCWolfe for posting these!

Please help if you can:

I am trying to understand the schematic of the Citation I phono section (V1 and V2) but I am confused by the switching.

The turnover and rolloff switches list 6 positions, but the rolloff switch
positions in the schematic are numbered 1 through 5 plus 7. The Turnover switch positions are numbered 1 through 7 and 9 and 10.

When the preamp is in the RIAA mode, can someone tell me please which capacitors and resistors are selected?

On the Citation IV, the function switch has 6 positions but the switch
positions in the schematic are numbered 1 through 6, then 9, 12 and 13.

When the preamp is in the RIAA mode, can someone tell me please which capacitors and resistors are selected?

I'm sure this follows some convention but I don't know the secret. Your
assistance is much appreciated. I see similar similar diagrams on the Dynaco
PAS schematic but they seem more understandable.

Thanks!
I'm sorry I didn't get time to answer before this. Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. Here's the rundown for the Cit I - this is based on the Harman-Kardon schematic:

(Ch. A) C90 through C94 & R134; (Ch. B) C8 through C12 & R21

I don't have the Cit IV info handy, sorry. but there are so few parts in a Cit IV that it's easier just to replace them all. If you need more info why don't you contact me directly - I specialize in Citation gear.
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Old 6th June 2012, 09:11 PM   #7
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First, thanks to everyone who replied. I didn't look at the forum for a few weeks but I really appreciate these responses.

I found the secret decoder ring for rotary switch schematics ! It is explained on pages 10 and 11 of:

classweb.intellitec.edu/VideosB/Drafting/ResourceDocuments/09.PDF

When I get around to it I will tabulate the results for the Citation I and check them against mine. Once finished I will post them on the Yahoo Citation group listed above.

Thanks so much! Mr. Fosgate's circuit is especially interesting. The designer of the expensive Leben phono preamp called the Citation IV "a masterpiece of design."
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