The mono switch on most preamps will function with any source, not just phono. In one of those links they were talking about some separate phono stages which include a mono switch. If you try to duplicate this with Y adaptors there are impedance/load considerations which could alter the sound, depending on where you combine/split channels.
Most of my listening is with a preamp w/o mono switch or with a passive preamp. I tried Y adaptors both on the phono signal going into the preamp, and on the preamp output. Both of these approaches were unsatisfactory. SQ was degraded to the extent that any noise reduction didn't matter. I didn't think to try it in a tape monitor loop. Also, I used solid body Y adaptors w/Teflon or nylon insulation.
I also have an old Mitsubishi tuner-preamp with a great sounding tuner which I use on a second system. It has a mono switch. This is where the mono switch did not provide adequate noise reduction with a stereo cart playing a compromised mono record. For the price of the MONO3, trying one was a no-brainer. A beat-up copy of Mozart Requiem, formerly unlistenable had noise reduced about 95%. It was astounding. SQ was still imperfect. This is an old wide groove pressing and I think the tip was bottoming out in-groove. This is where you need a 1 mil tip.
Although it seems that all microgroove mono pressings sound much better with this cart, it occurs to me that my direct comparisons to a stereo cart + mono switch, are limited.
Perhaps someone else made similar comparisons?
I went to a thrift store and bought some old mono records which looked to be in decent shape. I wouldn't have considered them with stereo pressings. Results should be interesting.
Most of my listening is with a preamp w/o mono switch or with a passive preamp. I tried Y adaptors both on the phono signal going into the preamp, and on the preamp output. Both of these approaches were unsatisfactory. SQ was degraded to the extent that any noise reduction didn't matter. I didn't think to try it in a tape monitor loop. Also, I used solid body Y adaptors w/Teflon or nylon insulation.
I also have an old Mitsubishi tuner-preamp with a great sounding tuner which I use on a second system. It has a mono switch. This is where the mono switch did not provide adequate noise reduction with a stereo cart playing a compromised mono record. For the price of the MONO3, trying one was a no-brainer. A beat-up copy of Mozart Requiem, formerly unlistenable had noise reduced about 95%. It was astounding. SQ was still imperfect. This is an old wide groove pressing and I think the tip was bottoming out in-groove. This is where you need a 1 mil tip.
Although it seems that all microgroove mono pressings sound much better with this cart, it occurs to me that my direct comparisons to a stereo cart + mono switch, are limited.
Perhaps someone else made similar comparisons?
I went to a thrift store and bought some old mono records which looked to be in decent shape. I wouldn't have considered them with stereo pressings. Results should be interesting.