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The AD843KN are not at all usable as a replacement for all 6 OPA's in the Jolida. You'll get a lot of nasty noise instead of "nasty subsonic level bass". I have tried them, too. You may use two of them for the output stage only, where they work quite well. They sound a bit less harsh than the original OP37. I also doubt that replacing the output coupling caps will make such a big difference, I have tried several caps and the result was not so overwhelming. The Jolida is sounding far too bright and I would be grateful if somebody had an idea who to reduce the treble a bit.
I use a Technics SL-1210Mk5G with either AT150ML, AT20SLa or AT33PTG cartridges. Amplifier is a Yamaha A-S2000. I have some good quality Panasonic 3,3 µF film caps in my box, which I will try today. It is not so much work changing these caps. I will post the result.
Yes, I know that AT's have a tendency to sound bright, but I like the sound of the 20Sla, there is something special with it. For me it is the best cart I´ve ever owned. BTW, the AT MM's son't sound so bright when connected with 100-200 pF. I forgot to mention my Denon DL103R, which is not bright at all, but with the Jolida it is.I have just replaced the 1µF output coupling caps with 3,3 µF Panasonic metallized polyester caps which I had in my spare parts box. After listening to several records I have the strong impression that the sound of the JD9 is more balanced now. Highs are the same but there is more weight and body in the lower register. I like what I hear and I will leave them in there except somebody has a good argument against it. I am asking myself why Jolida built in such a small value cap, should it act as a subsonic filter?
Dr. Ear,What are you using for a front end and for amplification? I can definatly hear a difference in my system when changing caps. I use a 1.5uf instead of the 1uf and the bass is as tight as I have gotten with my system.
alx, this seems to be the definitive solution. The Jolida sounds much more balanced now with 3,3 µF than with the stock 1µF caps. Lower Mid and Bass levels are now comparable to a Pro-Ject Tube Box II SE.Maybe Mundorf Supreme, Claricaps and Auricaps aren't the right approach because they were designed for tweeter crossovers with emphasis on perfect treble reproduction. The Panasonic film capacitor sounds very good to me.
Still no complaints about the 3,3µF output coupling capacitor? (Until now I could not hear any unwanted effects, just better bass). Just made a comparison between the Jolida and the phono stage of my refurb'd Yamaha A-1 integrated. My wife, uncorrupted like always, said that the difference is very small (with a small advantage for the A-1, which sounds a tiny bit warmer and music is a little more fluent).
i used Panasonic ECQ Series Metal Poly Fim caps because I already had them. 3,3µF/100V, they have the same size as the stock caps. There is no advantage using higher voltage caps, they are just getting bigger. I don't know how much the use of better quality caps would improve the sound. My experience with the expensive Mundorf (1µF) was a mixed bag, superb micro dynamics and resolution but lack of bass and too much treble. If there is no significant DC offset in the output, or if the amplifier is equipped with input coupling caps one could replace them with a wire bridge. I would have done so but my preamplifier is DC coupled.
The change in bass is just the property of the Mundorf cap compared to the cap you're using now. Replacing the 1uf cap with a 3.3uf cap shouldn't make any difference above 20hz. If you were to use a smaller cap, then it could affect something in our audible hearing range.
