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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
I listen to my NPR station (88.5 FM) almost every night on it.
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.
First, thanks to everyone who has shared the details of their experience with this tuner.
I watch the used tuner market closely and don't see more that one or two Citation 18 tuners on Ebay in a year. This is weird, as HK is hardly an exotic manufacturer. Does anyone know how many Citation 18 tuners were produced? Seriously, the 18 comes on the market less than the Marantz 2130 or the Scott 310-E.
Rumor has it that vintage Marantz receivers are very fashionable among the newly rich Chinese and they are being exported there.
Post your conspiracy theory here... Have fun!
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