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In Reply to: RE: Harman Kardon Citation 18 Audio Upgrades posted by Neff on October 22, 2011 at 15:44:48
I changed capacitors C1 & C15 on the IF board. C1 changed to a polyproplyene & C15 to Silmic II. Ceramics are not as good as poly types at audio & in the upper kHz range, but I have little background with regard to a better capacitor at radio frequency in the mHz range.
I did not hear any difference & the poly cap in C1 position did not de-tune the circuit. So, I only suggest upgrading C15 as an option.
Follow Ups:
Hi Neff
C1 is at Intermediate Freq 10.7 MHz, a silver mica is nice there, the PP will work, the only caveat for anything being used there is that it should be non-inductive.
C15 is composite signal & I used a SilMic II there myself.
You also may want to change out the decoupling caps on the board. That would be C10, C16, C20, & C21. Panasonic FM or FR are very good. Watch C20, on mine there was a factory substitute. When I replaced the decouplers you can safely double the cap value. C10 & 16 are the important ones, 20 & 21 are tied to the mute circuit.
HoosierAudio, where are you located in Indiana? Is the Citation 18 your favorite tuner or is this just one of many. I have read that Sherod loves this tuner.
Edits: 11/10/11
Yes, I would have used SM, did not have one- good suggestion. I am an old ham radio person & 'play' with RF myself.
I am also pleased you like this serious tuner as I am in bliss- absolute outstanding sonics using my upgraded Klipsch speakers & 2A3 SE amplifier.
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