Resistor in phono stage
Page 2 of the PH3 owner's manual talks about changing Input Impedance and Input Capacitance: http://www.audioresearch.com/ContentsFiles/PH3%20manual.pdf |
Thanks, mofi. What I see is a description of how to wire resistors (and/or capacitors) so they end up in parallel with the input, which will effectively lower the input resistance (and/or raise the input capacitance). Thus, the end user can achieve nearly any resistance desired, below 47K. (Resistors wired in parallel will always result in a net value lower than that of the highest value of any one of the resistors.) Adding a capacitor in parallel, using those same binding posts provided, will raise the total capacitance, since capacitors in parallel are additive in value. (Pardon me if you already know this.) But meantime, the OP seems to have lost interest in his own question. Which is fine. |
Lew, when you said "resistors wired in parallel will always result in a net value lower than that of the highest value of any one of the resistors," you probably meant to say "resistors wired in parallel will always result in a net value lower than that of the LOWEST value of any one of the resistors." Both statements are of course true, but the second one is more meaningful. Also, Mofi, the manual you linked to talks about using the phono stage in conjunction with moving coil as well as moving magnet cartridges. While 54 db gain is of course too low for many LOMCs in many applications, depending on the noise performance of the phono stage and the gains and sensitivities in the rest of the signal path I suppose it could sometimes be suitable for use with cartridges having relatively high outputs within the LOMC category. In any event, as Lew indicated further info from the OP is needed before his questions can be answered. Best regards, -- Al |
Thankyou guys,Ive been a bit busy.Im running a supex 900 super mk2.I had it on a zeta tonearm on sota sapphire. Unpacked after 6 years in storage ive put the supex on a sumiko mdc 800 and a mk4 sota sapphire. Using a ar ph3se.Things seem a little brighter on some records.Awesome on some others.I was just wondering maybe the impedance had been changed by a resistor.Process of illumination, if you like,thanks again |
