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In Reply to: RE: True mono cartridges, damage modern mono records? posted by M3 lover on July 27, 2014 at 13:25:00
Hi M3 lover,
Like you and John, I am unaware of a U-shaped Lp groove.
I do have to take issue with what you said about the 3 mill stylus and compliance. The 3 mill stylus is for 78 RPM standard groove records. The Lp records which came out in the '40s were also called micro-groove records and were to be played with a one mill stylus. At this time both standard groove 78s and Lps were lateral cut hence no need for vertical compliance in the pickup. Classic mono pick-up cartridges such as my GE RPX often had both 3 mill and one mill styli and little or no vertical compliance. These are the cartridges which must not be used on stereo records. With the advent of stereo the groove got slightly narrower and 0.7 mill styli became standard. They also work fine on mono records.
I would expect that even a classic mono cartridge would be safe on a mono record cut with a stereo cutter if the channels are balanced.
More recently "modern" mono cartridges have appeared. Many of these while not responding to vertical motion of the stylus do have vertical compliance and are therefore "stereo record safe". The example which the OP gave is to me a bit unknown. There is no clear explicit statement on vertical compliance or stereo record safety on their web page.
Phil
Follow Ups:
You're right of course and I'm glad you corrected my post. I know better that the 3 mil were utilized with later 78s while LP styli are 1 mil or smaller.
I was not certain about vertical compliance in older mono cartridges so thanks for that.
I have read from J. Carr, designer for Lyra, about benefits from their modern styli profile in their mono cartridges. And while that may be true for the number of mono reissues produced over the last several years with stereo cutter heads, I still wonder how optimum that might be with original monos from the '50s and '60s?
I bought a Denon 102 true mono cartridge a while ago but have been delayed installing it in the intended arm/table. I do have several hundred mono LPs from the '50s and '60s as well as nearly 100 45s so I look forward to that.
"You can’t know what the “best” is unless you have heard everything, and keep in mind that given individual tastes, there really isn’t any such thing." HP
Hi M3 lover,
From what I read you should love that cartridge. It has the advantage of being safe for stereo records while having good vertical rejection. With my RPX I have to be careful to not play a stereo record with it. I can run my stereo cartridges into my mono phono stage and sum in phase for lateral or out of phase for vertical. If there is a question about a record I play it with a stereo cartridge in vertical first. If I hear much it does not go under the RPX.
Phil
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