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JFET used in ARC PH3 hybrid phono pre amp
JFET used in ARC PH3 hybrid phono pre amp
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Old 22nd January 2011, 02:16 AM   #11
hrnoevil is offline hrnoevil  Canada
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I have to say I am overwhelmed by all the inputs internationally.
After re thinking about it, I have cold feet to proceed with this schematic.
You are correct that it is weird that ARC would used resistors values such as
31.25K, 518.1K etc. It is impossible to get these values, and it is a pain to connect the resistors in series to come to those values.
But if my interest rekindles I will further seek your help.
Thank you, thank you to you all.

Vancouver Canada
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Old 22nd January 2011, 02:46 AM   #12
wrenchone is offline wrenchone  United States
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You somewhat misread our intent, or at least mine. The misgivings were about the circuit topology, not its particular implementation (well, maybe that, too). I, for one, have no qualms about combinations of various 1% values to get an exact value for something like an RIAA network. That really wasn't the point. The point was that the overall circuit was kinda wonky, and that you might be better served by building a more recent and elegant circuit.
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Old 22nd January 2011, 03:24 AM   #13
Zen Mod is online now Zen Mod  Serbia
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JFET used in ARC PH3 hybrid phono pre amp
agree in every word
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Old 22nd January 2011, 04:43 AM   #14
Zero Cool is offline Zero Cool  United States
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ARC uses special house numbers for parts that are selected and graded based on specific values. WHAT those values are is proprietary information. at a guess a 2SK170 would probably be a pretty good choice.
It's not about what you can BUY...It's about what you can BUILD!
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Old 28th March 2013, 09:57 AM   #15
coffin is offline coffin  Taiwan
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I have asked a guy who'd repaired lots of equipments including ARC's, and he said he didn't know what those JFET were. When JFET was broken, he just filed the application for the part to the distributor, and they would send the part to him.
Ignorance and self-centered are the epidemics of human.
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