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Harman Kardon Citation I Preamp Left Channel (Phono) Not Working

Hi,

Has anyone had experience in fixing a Harman Kardon Citation I preamp? The left channel of the phono section stopped working one day. I opened the panels to take a peek inside in an attempt to see if there's a loose connection somewhere. Well, HK employs the pc board approach (instead of point-to-point). There were wires upon wires criss-crossing each other. It was impossible to get to the innards without disassembling the whole thing!

Has anyone successfully taken apart the whole thing and put it back together? I can't even find someone (reputable) who is able to fix a Harman Kardon Citation. This is very depressing as, since the incident, I have been listening to my record albums with my "other" stereo set up (without a phono section) via an old Radio Shack phono stage (a puny little 2"x4" gadget). Needless to say, the sound is less than ideal. I have stopped listening to record albums since (yes, after listening through a Citation, nothing else will do as the music has lost that "concert hall" sound).

Regards,

David



Harman Kardon Citation I Preamp Left Channel (Phono) Not Working

Replace the 12AX7 tubes in the phono section first. After that, Check capacitors in that circuit.

Harman Kardon Citation I Preamp Left Channel (Phono) Not Working

Hi Johnnysan,

Thank you for your response. I checked the tubes in the phono section and they are fine (that was the first thing I did - I switched the 12AX7 from the working channel to the side that's out).

The problem with the Citation I is, the top and bottom sides each is responsible for a channel. I am not sure which side is for the left channel. If the bottom side turns out to be for the left channel, then there is no easy way to get to the capacitors (short of disassembling the whole inside).

Have you experienced the same issue? Were you able to find the malfunctioning capacitor?

Please advise.

Thank you,

David

Harman Kardon Citation I Preamp Left Channel (Phono) Not Working

First, make sure there really is a problem with the pre-amp; switch phono cables to make certain the channel is dead.
Next, observe the 12AX7 filaments in near darkness; should be two filaments lit. If not, there is a bad connection to pin 3 or 4.
After that you need to do some technically involved troubleshooting, like voltage checks and scoping out the signal. If you don't have the right equipment then you will need a tech who does. The problem could be coupling capacitors open or no B+ getting to a tube, or just bad connections.

Harman Kardon Citation I Preamp Left Channel (Phono) Not Working

That I did not do. I will check that. Thank you for your information.