antennaguru wrote:Yes, the single ground wire goes from the chassis of the turntable and/or tonearm to the binding post on the phono stage, as it normally should - unless you find you get a ground loop with it connected and it sounds quieter disconnected.
antennaguru wrote:WRT using additional resistors I am wondering what you are considering that for? There would be no need to do so unless your phono stage is being overdriven by your cartridge and you need to attenuate the signal to avoid clipping distortion in the phono stage, though that would seem unlikely. If that was the case you could use various Tee or Pi resistor configurations as attenuators.
Hope this helps!
I've seen a number of schematics that include resistors in them as you are basically shorting out the output. Maybe this is most important for higher output devices, though, like a 1/8'' smartphone headphone jack? I guess in those applications is mostly where I've seen resistors used.
Any rate - using my little summing device here has made vast improvements in the playback of a mono copy (a rather bad one) of Getz/Gilberto on Verve so I'm happy with.
antennaguru wrote:Glad that using the back to back Y adapters is working for you! It really does Help when playing mono records, both in reducing surface noise and evening channel balance!
Back in the "golden" era when records were our primary quality music source the electronics manufacturers used to give us really useful features in our preamps such as a really good "Phono Stage", a "Mono Switch" to sum the channel balance for mono records, a "Subsonic Filter Switch" to calm down the woofers/subwoofers on warped records, and a "Balance Control" with a central detent (off position) to shift the central image when needed, which have one by one disappeared from many modern preamps because only some people use only some of them, some of the time - so now no one gets these sometimes very useful controls any of the time in the quest for minimizing cost/complexity and being competitive. No one argues these were all useful features when they existed and being defeatable they didn't hurt the sound. However, "Simple Defeatable Tone Controls" were also useful to touch up the frequency balance of certain recordings, but again another useful feature that got eliminated over time for the same reasons with little objection from us under the guise of simpler purer circuitry, ignoring that the defeat switch gave us that as well...
JDJX wrote:Yes, resistors insure that any pre amp is "happy" with summing both channels.
Also, summing both channels does indeed make mono LPs sound better.
This is the resistive stereo to mono converter that I built...