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I purchased a cheap demagnatizer off of ebay [recently], and just yesterday demaged my entire system; from cables to tubes, to the ac outlets.--expected this to have a pos result, but I CAN NOT BELIEVE what a difference...
The two areas I believe [I'm guessing here] benifitted most are the wall outlets, amps cover/chassis, and vactubes...this is where the thing started to hum {over ferrous metals, screws, etc.].
Wow. best 20 I've spent in a while..
fc
Follow Ups:
a
I have a Nakamichi DM-10 tape head demagnetizer. I took the two tubes out of my SP9MkII and demagnetized them buy moving the demagnetizer slowly over the face of the tube and pins almost touching them. And then I slowly moved the demagnetizer away at least three feet and then shut it off. I heard absolutely no difference in sound quality. Sorry. I also tried to demagnetize a CD and a SACD the same way. Still heard no difference.
that means your tubes weren't 40 year old stock and magnetized, and that your transport is pretty darn good and doesn't need much tweaking to do the job.
check here for what you could have heard had your tubes been in worse shape:
are you guys demagnetizing tubes with the amps (or whatever) on or off?
I pull them out.
Sorry... That message number is not valid.
nt
I had the same thought, although I'm not sure it would do any harm.fc
keep the thing away from magnetic media such as computer hard drives, and anything else that stores information magnetically.I generally get the best results doing the tubes. In some CD players I have noticed improvement when demagnetizing store-bought CDs before playback while CD-Rs do nothing. Cables, connectors, outlets - yeah, cant hurt, but I can't hear a difference after that, so I assume my gear is not sensitive there, or it just can't affect the sound even if there is a magnetic charge.
told you so...search the bottlhead forum for some proof - somebody actually measured before/after and that's about al that matters.
I use an old Nakamichi tape head demagger on my Telefunkens about once a week - now with little effect, but that's good. I don't want to have to do this every 2 hours. The first time you do this will be the biggest wow, especially on some 40 year old tubes.
Is it possible that removing and reinserting a tube or cleaning the contacts could be happening? Curious - if this magnetizing thing works it would be worth it - just asking if consideration of these things are an issue?
my tube pins are just about as clean as they can be - about 20 minutes of careful dremel polishing plus an application of PRoGold contact enhancer done pretty much monthly. There is no difference in sound between pulling them, swapping them, etc. There is a significant difference in sound when I do the demagnetizing. again - for reference a post in the bottlehead forum where somebody actually measured what happenshttp://db.audioasylum.com/cgi/m.mpl?forum=bottlehead&n=83595
nt
I have one of these from my Reel to Reel days. About 8 inches long with a rounded plastic tip that would hover over the recording head? Or is it more of a bulk eraser type with a plate several inches across?
nt
That is a phenomenal result...can you explain what kind of demagnetizer you used and how you used it? Normally, you need to reverse the field repeatedly, diminishing it over time. How did you accomplish this? Very interested in your results.
it's a tape head demagnetizer..I simply swept small areas {slowly}, in some cases almost touching the components, tubes etc.,
I would then slowly pull the demagnetizer away from the area, and turn it off[unplugged it] @ several feet away from the component.
Repeated process several times throughout the system.
wineau:
This may sound like hokum, but I've had good results demagging tubes and CD's with a hair dryer. The motor puts out a strong, unshielded AC field. The technique I use is to turn it on, slowly approach (from about 6') what I'm demagging (with the "back" end), move it around slowly for 10 secs. or so, then slowly move it away 6' before turning it off. The effect is very noticeable. Some CD's respond more than others, depending on their ink, which contains magnetic (ferrous) particles. Same with tubes, depending on plate composition. I'll try fatcobra's tweak. It sounds like it might even work with components.
nt
S+R Audio [guy sells these on ebay]. I think it's re-packaged nos tape head demagnatizer. 20.00 shipping incl.
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