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In Reply to: RE: Anyone reduced the gain in Jolida JD9? posted by tketcham on November 29, 2016 at 20:55:32
Solder a 100k tantalum resistor to the RCA input "hot" then on to the "hot" input wire; solder a 10k metal oxide or carbon comp to the RCA input ground and on to the ground input wire.
See what that does and adjust accordingly if necessary. More attenuation change the 10k to 5k or simply solder another 10k in parallel with the first. Less attenuation leave the ground 10k and lower the value of the 100k.
There's too much made of negative effects of attenuation circuits. You're speakers likely have them and I've never noticed any loss of dynamics or other ill effects in a amps or pre-amps. Just lowered gain.
Follow Ups:
When you say RCA input "hot" are you meaning the high output RCA connection (to the integrated amp) or the actual RCA input connection (from the turntable)? Please forgive my electronics ignorance, I'm just wanting to be sure when I consult a local soldering mentor.
Thanks!
Tom
Hi, kitch29,
Thank you for the suggestions.
I find your comment on attenuation circuits interesting: "There's too much made of negative effects of attenuation circuits. "
From what I've seen posted regarding the JD9's gain attenuation, it relies on trim pots for the "LO" output connection. And those trim pots seem to be consistently criticized by audiophiles posting on a number of forums. But there are people like yourself who consider the trim pots to be a non-issue.
I'm still on the fence; I cannot say for certainty that I notice much (if any) difference using the attenuated output. The problem is that it's very difficult to compare between the "HI" and "LO" settings with the same cartridge, at least with the cartridges I'm currently using; the "HI" output overloads the cartridge and degrades the sound. So I guess the obvious answer is that the "LO" output sounds better. '-)
Regards,
Tom
Don't confuse very high quality resistor circuits with IC or even discrete pots and especially L-Pads.
Edits: 11/30/16
Point taken. :-)
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