So I just measured my wow/flutter with and without a record using RPM WOW. Three measurements each with the record on the turntable and one without. Lifting and placing the phone back on between each measurement. Without it is .05, .05, .08. With it is .05, .05, .04. (RMS). My guess is that the needle doesn't make enough of a difference to be registered by the phone/app. There is no evidence that music is causing swings larger than .1. Is there any evidence that the needle causes significant drag to be heard? Do you know where the .1 figure for audibility came from? Thanks!
High output MCs have higher resistance coils due to many more turns of thinner wire, so the DC resistance goes from 5-20 ohms or thereabouts, to 100-200 ohms or thereabouts. This is still quite a lot lower than a moving magnet's DC resistance which is typically 500ohms plus, and still hugely lower than a MMs inductance. HOMCs are still much less sensitive to loading than an MM, but somewhat more than a LOMC, especially to resistive load. This isn't much of an issue as they're designed to be used in a normal MM input of 47k ohms. Their main downside is higher moving mass, due to the heavier coils.
I knew that high output moving coils had more turns of wire but then if the metal core is not used for higher output then what is it used for?
Not specifically, it was what at the time we considered 'good enough', and both pro and consumer magazine reviewers accepted as the standard. Given that there are several ways of measuring W&F, all which give different numbers, my view was that if the number quoted was less than 0.1%, it was good enough however measured. I was always suspicious of very low W&F numbers as I then question how they were achieved. Test tapes and test LPs have their own intrinsic W&F built in, so a manufacturer quoting very low figures raises questions.
As I said, I don't know why anyone would use a metal core as I can only see disadvantages.
That's my point - doesn't matter what happens as you've confounders.
I did read a review of the demagnetizer on Analog Planet, but I do not recall there being any testing done other than Fremer's listening impressions.Am I allowed to courteously suggest that there may have been extensive research and consequently, useful answers to your query on Analog Planet Bob?
(I do appreciate there are many reasons for not going there, until you absolutely need a half million dollar TT, but!)
Thanks - I went back and googled the review from the mid '90's. Pertinent paragraph from Fremer below. While it is possible what he says is true, that kind of change should show up in measurement. I will try to measure for a difference in the next week or so.
www.analogplanet.com
Kind of related to this, 10 years ago or so I heard the same thing about demagnetizing the LP itself! It seemed laughable until someone captured the output of the turntable before and after demag. It was undeniable. It improvements were just as you mention: more open, and generally nicer. Waveform analysis clearly backed the results.
OOOOKKKKKKAAAAAYYYYYY.......I'm going to give you the benefit of the doubt here and ask - can I use my Hand-D-Mag that I usually use for demagnetizing tape heads to 'demagnetize' an LP? If so, I'll try it and report back. What type of demagnetizer did you use? Are you sure the effect wasn't just of eliminating static electricity buildup, in which case a Milty Zerostat would do the job.
Thanks for the insight. Your reply is a great example of the kind of discussion I was hoping for by starting this thread.
It has been a couple of years since I used the demagnetizer - there was some MM use for awhile. Then I purchased the Hana and it has never been flux busted. When I did use it, it was months between uses. Cleaning wise, I always clean my records before the first playback on the vacuum record cleaning machine. The stylus gets the brush treatment enough to clean the stuff I can see with occasional Stylast cleaning liquid. A cleaned record will get the carbon fiber brush treatment if it looks dusty - sometimes will get another vacuum cleaning if I think it needs it. In short, I do enough cleaning without getting “anal” about it. The desired result is enjoyable listening.
I do the same ... and i have records cleaned 5-6 years ago sounding without clicks and pops today.
