Harmon Kardon Citation 1 Vacuum Tube Preamplifier - diyAudio
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Old 6th May 2009, 08:28 AM   #1
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Location: Minneapolis, MN 55404
Default Harmon Kardon Citation 1 Vacuum Tube Preamplifier

Vintage Harmon Kardon Citation 1 Vacuum tube preamplifier for sale. $425.00

Click the image to open in full size.

The Citation 1 is great for a collector of old records, because in addition to the RIAA equalization curve,
it has selectable equalization circuits to adjust for the various recording equalizations that were used
before they standardized on the RIAA curve.

Click the image to open in full size.

The tone controls are stepped switches. This allow for completely flat frequency response if you desire.
Because switches are used, it doesnít have the distortion caused by potentiometers.

Click the image to open in full size.

This preamp is in working condition and sounds surprisingly good for itís age. It still sounds better than
most solid state equipment. Upgraded with modern components it could sound superb.

Click the image to open in full size.

Click the image to open in full size.

This preamplifier appears to be nearly stock. Two of the tube shields are missing. However, the tube
shields on the high level output tubes arenít even necessary.

Click the image to open in full size.
Click the image to open in full size.

The only work that appears to have been performed is the replacement of the filament rectifier diodes
and the series resistors. The original pair of resistors were 3.3 Ohm. They were replaced with
adjustable wirewound resistors. This allows you to adjust the filament voltage as you desire.

Click the image to open in full size.

When this preamplifier was designed, the powerline voltages were lower. It is often necessary to add
voltage dropping resistors to the filament supplies to reduce the filament voltage to the proper level,
as the filament voltages are often too high because of the higher line voltage that we have today.

You can adjust the filament voltage to as low as 11 volts per tube for extended tube life, or as high as
12.6 volts for highest transconductance.. At present the filament voltage is adjusted for 11.6 Volts.
I can readjust this for you if you prefer a different voltage setting.

These resistors can easily be replaced with fixed resistors to return it to a stock look.

The condition of this preamplifier is not pristine. See photos. But if you want great sound at a bargain
price this preamplifier is for you.

Specification and original literature
http://www.allegrosound.com/Citation_1.pdf

Schematic Diagram:
http://www.schematics.ca/uploads/PDd...ic_diagram.gif

If you would like to upgrade the preamp, SDS Labs has designed a circuit board to replace the old style
multi-section electrolytic capacitors with much better sounding modern electrolytic capacitors.

http://www.quadesl.com/refurb/refurb_hkCitation1.html

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The preamplifier is warranted not to be DOA. I do not warranty the vacuum tubes. However, I will pack
them well so that they wonít break. during shipping Or if you prefer I can ship the preamplifier with the
tubes installed, but that is at your own risk.

Local buyers may pickup & save shipping cost. I will accept cash if you are local. But please, no cash
through the mail.

Mailing is ACTUAL COST, NO Handling charges!!! Add insurance if desired.

Shipping weight is about 30 lbs.

I accept PayPal and can also accept credit card payments through PayPal. I don't accept e-checks. I only
accept PayPal from buyers with verified addresses.

sanovak@comcast.net
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Old 6th May 2009, 12:58 PM   #2
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Old 6th May 2009, 01:01 PM   #3
whiteSE is offline whiteSE  United States
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Old 18th May 2009, 06:25 AM   #4
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Location: Minneapolis, MN 55404
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Sold!
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