Elliot, you have a point. I chose to use 3.54 cm/sec as a standard because 30 or more years ago, that was the standard stylus velocity for calculating output. But you’re correct that in the last few decades, 5cm/sec has become standard. I chose the older standard because I reasoned that MM cartridges of the same vintage as the ADC would have been rated using that standard. This is a subject about which not much has been written. I agree that yogi’s data, that the output was 1.1mV or thereabouts is probably the sensitivity spec, not corrected for the stylu velocity standard, whether that should be 3.54 or 5cm/sec. If so, the units would be mV/cm/sec.
ADC moving-iron cartridge has "low" output
I have two identical ADC gold-body XLM-III carts from the late 70s. I purch'd them used, as part of two turntables that were each purchased from different parts of the US. Each cart has a different model of stylus (XLM-III and QLN-2) , and styluses can be interchanged.
The MI series from ADC should output 5.5mV, which I have not measured. However, BOTH these carts are challenged wrt output volume. Not only do I have to crank up the vol. more than 1/3 above other carts, but the sonics are a bit "small" and not "full bodied". It might be due to weakening permanent magnetism -- these are both getting close to 50 yrs old .
The perm. magnet in ADC moving iron series is mounted in the removable stylus, just above the stylus/cantilever assemble.
Not sure what else the low volume may be due to??? These are my my only MI carts in my collection. Anyone know more?
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shibata for xlm mk-iii https://lptunes.com/collections/adc-needles-stylus/products/replacement-for-adc-rsz-stylus
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Thanks! Those are very low $$ for supposedly Made-in-Japan products. I assume other here on Audiogon have dealt with LPgear here (???) so no issues with fakes or new-old-stock (suspensions do rot with age).
The other resource, like https://www.adelcom.net/ADCCart1.html , are significantly pricier. Not sure about that site! |
The ADC armature (see fig.) is "special" . I assume they overproduced these decades ago (along with mounted stylus) . So maybe that's what the LPgear has stocked. About suspension -- esp. after decades of aging -- I think it is NON-use that causes them to stiffen (at least in my experience).
About high $$ replacements ... check out the this page ... https://www.adelcom.net/ADC%20Stylus.html I have no idea how re-manufs handle the SUSPENSION BLOCK issue!! |
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