Mono vs Stereo LP's


I recently purchased a 1958 mono issue of Art Farmer's "Farmer's Market" on the New Jazz purple label (New Jazz was a Prestige specialty label) The record looks to be in near mint condition and was carefully cleaned by me with a record vac. The recording, however, plays with a constant background noise or hiss. The dealer who sold me the record has a reputable history and is telling me the noise is because I need to play the record with a mono cartridge rather than my stereo Shelter 501. I have read the threads on Audiogon regarding mono cartridges which say they can sound better, but don't suggest there would be the type on noise I am hearing with stereo. I have many other mono records of similar vintage and have never encountered this before. Anyone have a similar experience to this?
128x128jyprez
Ooops, I was under the impression that the LP I have was issued in 1956, so maybe we have different pressings. Anyway, it has the same hiss. Does your pressing have the release issue NJLP 8203 (which I am assuming) or PR 24032?

I THINK that this title was released in the OJC series. Wonder how it sounds. I ask because I have a Horace Silver LP which has similar, very mild hiss on the original recording but it is gone on the OJC re-release, though the re-release is far less "earthy" and less enjoyable.
4yanx..."No record cleaner will remove that, it is part of the recording".

Have you heard the "record cleaning" that can be done by digitizing the signal and processing it with a computer? Absolutely amazing. I am talking about recordings made almost 100 years ago, barely audible in original form, but where the cleaned up version sounds almost acceptable today.
I tried a little experiment this evening based on suggestions here and the Asylum. I got two Y connectors at Radio Shack with reversed male and female RCA connectors and used them to blend down the stereo outputs to mono and then in to the phono pre ins. This produced a clear 50+% reduction in the noise. I had read that the noise is out of phase between the channels and some will cancel out. The level is now quite low and easily makes the record quite enjoyable. I think, however, that a good mono cartridge may be in my future.
BTW 4yanx, the record is the plrp 8203 purple label (also identified as New Jazz. This is listed as 1958 issue, the same year as the more coveted (but more expensive) Yellow Label. Goldmine shows a number of NJLP 8203 for these but my record has prlp 8203 on the label. The Prestige 24032 was supposedly released in the 70's.
Glad you got some resolution, there, J.
Fair enough on the pressings. Mine is a yellow and was originally my father's who bought it new. Farmer was born in Iowa as was my dad and I. They shared some mutual friends, and Farmer was one of his favorites. He swears the LP came out in 1956, and it won't be me that argues the point with him! Ha!