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On my Pioneer SX-1250 I have more line level sources than I have inputs... but I have an unused phono2 input. I want to bypass the phono preamp on one of my phono inputs to convert it to a 2nd aux input. I am thinking that I should convert Phono 1, so that I could still use the mic input which Phono 2 goes thru (although I haven't used a mic yet).Anyway, my main question is, if I DeoxIT the mic jack phono switch contacts, should going thru the mic jack alter the response or add noise to the phono input?
Also, am I correct in assuming that I should add 100 ohms in series with the new aux 2 inputs? The aux 1 input has them.
Follow Ups:
There is a reverse RIAA phono input adapter that will allow you to convert to line inputs. You can find it a Audio Classics. Just click on the "Service Department" and scroll down the page.Regards,
Thanks for the suggestion, but I would expect to get less distortion and more accurate equalization by bypassing the phono preamp than by attenuating/equalizing the line level signal to phono levels and then running it thru the phono preamp to get it back up to line level.Hopefully I will find time to tinker with this over the weekend.
I have the service manual, and it should be an easy change to make.I do have a line level audio switch/mixer that I could use (as the other responder suggested), or I could use a tape input on my equalizer, but I want to keep my setup as simple and user (family) friendly as possible... one row of switches on the receiver to select any source.
One more question.
Should I ground the unused phono preamp inputs to keep the phono preamp quiet when using a phono input for aux 2... or does it really matter?
What you need is a schematic to show the circut. Some Selector switches short the unused inputs, thus no additional benefit from adding shorting plugs. The circut from the Aux or unused inputs may also then be properly replicated (Phono & Microphone circuts introduce EQualization intended per that source). OR, instead of modifying, simply go to a local Radio Shack & purchase an outboard input-expanding switch box. Several models from a 3-input Audio switch box up to 12-input A/V switch boxes with remote control. Such boxes also solve the closely-spaced input jack *problem* when using modern interconnects vs vintage patch cords (which have smaller diameter plugs).
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