citation 7.1

[mr l]

does anyone have or know of schematics for the h/k citation 7.1?,it was a 4 x 150 watt channel amplifier. last of the citation series around 1997.

 

[djk]

Send an email to 'burnedfingers'

 

[Burnedfingers]

I sent the schematic. If I can be of help feel free to email. They are a nice amp but a pain to take apart and repair. Did I mention heavy?

Joe

 

[Loris]

Hi Joe, I aslo own a couple of 7.1.

May I ask you a copy of the schematics ?

I tried to send you an e-mail, but it seems that e-mails don't work properly through this board.

Thanks,
Loris

 

[Burnedfingers]

Loris

Unfortunately I gave away my Citation service manual with the last Citation I sold, sorry.

 

[Loris]

Maybe Mr l still have the mail you sent him with the schematics. I sent him an e-mail, let's hope

Thanks for your help,
Loris

 

[MOER]

Citation 7.1

We are the original designers and manufacturers of these Citation 7.1 and 5.1 amplifiers

We of course have schematics and I use the last 2 production amplifiers at home

Rated at 125w x 4 at 8 ohms

Stephen Mantz
Zed Audio Corp.,
Los Angeles CA
www.zedaudio.com

 

[mr l]

hi loris,
you should have mail.if not let me know.

 

[mr l]

i thought madrigal were the designers & manufacturers of the h/k citation 7.1 (mark levinson manufacturer)

 

[MOER]

Citation 7.1

Sorry but Madrigal had nothing to do with this project. My company was the sole manufacturer anf designer of these two amplifiers.

Stephen Mantz
Zed Audio Corp.

 

[Loris]

Thank you Michael,

your mail is arrived.

Infact, my citation's package still has the ZED AUDIO sticking, which states it was produced by them and delivered to a Citation Facility

Madrigal only contributed to make the Citation death, exactly as They did to Procced line.

What a shame.

 

[Burnedfingers]

Source for IC?

I am looking for a source for the LF411CN in the citation 7.1 amplifier.

Is there a suitable sub for it?

Also does anyone have a readable schematic for the revision C board?

 

[djk]

Hi Joe!

A TL071 has too much off-set (could be as much as 10mV), an OPA604 would be better.

 

[Burnedfingers]

Thank you Sir. Would you happen to have a source for the OPA 604 IC?

Any ideas on why the front end seems to have a weakness on the 7.1?

Any suggestions for increasing their life span? Looks like maybe the transistors are being pushed to the limits.

But then again the copy of the schematic is blurred and hard to read.

 

[djk]

OPA604AP-ND, Digi-Key $2.36, 1000+ in stock.

They also have the LF411CN-ND in stock for $1.63, you could use a TL071/81 for troubleshooting purposes (higher off-set).

Is the gain weak?

 

[Burnedfingers]

This is another one that has lost its front end. Shorted small transistors but output stage is fine.

 

[mikeks]

Re: Citation 7.1

We are the original designers and manufacturers of these Citation 7.1 and 5.1 amplifiers...
Stephen Mantz
Zed Audio Corp.,
Los Angeles CA
www.zedaudio.com

Hi Stephen...Excellent website... !

However, there are some factual inaccuracies in your .pdfs that you might want to address...get in touch..

 

[Burnedfingers]

DJK

So far the only transistor losses are the 1st trip on both sides.

2SA1360 and 2SC3423-Y also lost was 2SD1292

Transistors no one is stocking anymore as follows..

2DC2389, 2SA1038, 2SD1292

The outputs can be replace with the newer PN Toshiba's

don't try the fake 1302's and 3281's

Do you have suggestions for the 2sC2389, 2SA1038, 2SD1292's?

Also, this amplifier seems to have stability problems. Is this due to the fact the transistors are run to the edge? Amp likes to oscillate when using 4 conductor speaker cable. This is not good when trying to run surrounds or L&R on a home theatre system.

Its real close to the amp you and I built back in 93. Ours didn't have the Op Amps in it.

 

[Tim Mical]

Citation 7.1 Schematic- PLEASE!

Hello,

I'm new to the group. I just purchased a Citation 7.1 and the left two channels aren't working. Channels 3 and 4. The power supply is fine and the inputs are working. After reading this thread, I was wondering if I might get a copy of the schematic for the amp so I can trouble shoot the problem.

I tried to request it directly from Moer but it will not let me email him directly yet.

Thank you for the opportunity to join your group.

Tim Mical

 

[MOER]

Citation

Our email address is "zedaudio@aol.com

Steve Mantz
Zed Audio Corp.