How are you playing your precious MONO Vinyl?

@lewm Sorry to verge off topic a bit but weren’t the grooves in the mono micro groove pressings wider than the stereo grooves but more narrow than the original mono grooves?

Not a groove expert. I only have read what I wrote, which only applies to the 33 rpm era post ~1948. 

“I don’t understand exactly what you are after”

@lewm 

Let me try to clarify. 

You described how your UK EMI mono pressings of Ella & Louis sound “off” with RIAA EQ, while the US originals sound wonderful. I was just curious: have you ever tried listening to those UK EMI pressings using a different EQ curve, like CCIR or EMI, if you have access to a phono stage with that option (like the EQ-100)?

Sometimes switching to a different EQ curve—by ear—can make those “off” pressings come alive. I’m not suggesting it’s about being historically precise, but rather asking…. have you experimented to see if any other curve actually sounds better to you on that specific recording? 

I recognize without definitive info on the original mastering EQ, dialing in playback EQ is largely educated guesswork. And while something like the EQ-100 offers flexibility with its 10 curves, it’s ultimately your ears not the curve selector that decide what sounds “right.” 

That’s all I was getting at—purely from a listening and enjoyment perspective.

As I said before, EQ-100 is an interesting product and it may lead to new discoveries, such as musical expressions and the performer's intentions that have previously been buried or hidden. 

I don't have any phono stages with options for the de-emphasis curve.  They are all RIAA.  And since this one pair of LPs on EMI are the only LPs where I have ever noticed a possible problem, it has not and will not be worth my while to buy one.  I have several other copies of Louis and Ella both original pressings and re-issues that sound fine with RIAA.  I would wager those EMI pressings are original in the UK, because the LPs are obviously very old; the quality even of the album cover jackets is sky high. If I ever have access to a phono with options for EQ, I will give them a try.  when I was a kid, my parents had a Harmon Kardon mono receiver which did provide at least 3 curves.  I used to play with them while listening.

⬆️ It makes sense not to chase a specialized phono stage for just one anomaly, especially when the rest of your collection sounds great through RIAA. 

Thanks for your participation!