@cleeds No there are true mono designs made today that play in both right in left channels. Those cartridges have four pins on the back. These make up the large majority of cartridges on the market today. You can buy mono cartridges that play in only one channel and they will have two pins on the back, Most of those cartridges are specially ordered, i.e. Miyajma. The distinction between true mono cartridges and those that are not, pertains to whether a stereo cartridge was strapped. This has been discussed in past Audiogon posts to great detail.
Where do classical vinyl records get their rumble from?
Recently converted back to vinyl from silver disks, I am struck by how much rumble seems to be inherent in the new and used vinyl I am buying.
A case in point, is a recent Deutsche Grammophon (DG) recording (487 7484) of Mahler’s Second Symphony made at a live performance at the Sydney Opera House (I was there). The first set I bought was amongst the dirtiest pressings I have ever had, but the second set was much improved. However, there is a persistent rumble whether played on my Holbo Mk2 air bearing system or my venerable Garrard 301 (new bearing from Classic Turntable Company).
Mahler typically has huge dynamic range, from muted off-stage performers to hundreds of musicians going hell-for-leather.
The rumble could be partly caused by the venue’s air conditioning system, but I hear similar background on a Telarc recording (Stereo 10051) of Saint Saens Organ Symphony made in Philadelphia. Telarc even arranged to have local roads shut down for the recording sessions.
Similar efforts were made by DG when recording the organ at Notre Dame in Paris, where recording was done late at night to reduce traffic noise. My copy includes Dolby Atmos on Pure-Audio Bly-ray (DG 486 1466).
I was beginning to think the rumble was inherent in my tables, but then I played a German Direct Metal Mastered (DMM) set from In-Akustik for Clearaudio’s 40th anniversary (INAK 78051 2LP). It includes some Telarc tracks. This set has the quietest background I’ve never heard. There is virtually no rumble, exonerating my tables.
So apart from the recoding venue’s air conditioning and traffic noise, why do so many classical records seem to have built-in rumble? Could it be from the mastering lathe?
I am really only thinking about classical recordings where the dynamic range approximates the signal to noise ratio of vinyl, meaning that very low-level signals are musically important, while simultaneously bumping against the noise floor.
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Of course. But if it has vertical compliance consistent with the Westrex 45/45 system, it's not a "true mono" cartridge. It's that lack of vertical compliance that makes a true mono cartridge incompatible with a stereo LP. |
@cleeds So Miyajima, Hana, EMT, Ortofon and Audio Technica cartridges are not true mono cartridges because they have two balanced mono coils and play mono in both the right and left channels. That doesn't make any sense to me but you apparently have a definition of what's a true mono cartridge that's different from what everyone else thinks. |
To All, While I may have been impetuous and inaccurate about exactly which mono designed cartridges use two balanced mono coils and which use a single, both designs exist. And both designs can be considered a true mono cartridge. My determination for a true mono design is based on the differences between a strapped stereo cartridge and one that is built from the ground up, for strictly mono. The Hana mono cartridge is described as a true mono, single coil cartridge that can be used on a stereo pressing without damaging the record. Here is AI’s response to the single coil to dual coil mono design approach; Two Coils vs. One: Traditional true mono cartridges rely on a single coil. However, cartridges described as having "left and right mono coils" typically feature dual moving coils (like a stereo cartridge) internally wired or angled to respond only to horizontal movement. This dual-generator configuration allows the cartridge to present a balanced load to your preamp, avoiding the ground-loop hum issues that can sometimes occur when bridging a single-coil mono cartridge to two stereo inputs. The Audio Technica AT33 Mono as recommended by Jonathon Carr on an earlier Audiogon post. The AT 33 Mono has two distinct, horizontally oriented coils.
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Rather than trawl through umpteen posts, I asked ChatGPT, which of course has already trawled through Audiogon posts
As a bit of an aside, current DS Audio optical cartridges cannot be strapped, because two of the four wires carry a DC voltage to power the Light Emitting Diodes in the cartridge. Also a bit quirky is my Soulnote E-1 Ver2 Equalizer, which acts as a phono stage for MM and MC cartridges, as well as being an equaliser for DS Audio optical cartridges. It has a switchable low-cut filter designed to mitigate the audible effects of warps, but the filter only operates on MM and MC inputs The Soulnote is also a bit unusual because it does not use any negative feedback. Negative feedback improves distortion numbers in the frequency domain, at the expense of smearing signals in the time domain. I get the sense that every 'quirk' in the Soulnote has been carefully thought through by the designers, so it is no accident that the extended bass from optical cartridges is kept intact. Also, there is no mono switch - that is left to the pre-amplifier When I think about my vinyl playback systems, there are three critical components. I would like my turntables and cartridges to be neutral, minimising added noise and coloration. Against this quiet background, the Soulnote phono-stage / equaliser seems to make an astonishing difference though I have no rational way of apportioning the plaudits. |
while building its Large Language Model!
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