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Ludwig Supraphonic COB Last viewed: 1 second ago

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From jaghog

found this on the netParamagnetic materialsParamagnetic materials are metals that are weakly attracted to magnets. Aluminum and copper are such metals. These materials can become very weak magnets, but their attractive force can only be measured with sensitive instruments.Temperature can affect the magnetic properties of a material. Paramagnetic materials like aluminum, uranium and platinum become more magnetic when they are very cold.The force of a ferromagnetic magnet is about a million times that of a magnet made with a paramagnetic material. Since the attractive force is so small, paramagnetic materials are typically considered nonmagnetic.

The reference to copper here is more important than aluminum.Nickel and COPPER are used as base metals in chrome plating.Copper and nickel are applied to the raw aluminum shell prior to the chrome.Copper is a paramagnetic metal ...so the purity and amount of copper being present and the thickness of the chrome plating may explain the magnetic attraction or lack there of.

Since the acrolite is not chromed,there are no base metals on its shell,so its magnetic attraction if at all present,is less than that of a supra.Thats my argument anyway.

To tell what metals are actually present,you would have to use a scanning mass spectrometer.That machine will tell you what base metals are present ,and in what amounts.Other that the NYPD crime lab,I'm not aware of anyone else that has one.

How about we all chip in,find a lab who has one ,and send them a cross section of supras....and put this thing to bed once and for all.....just a thought.:confused:

Steve B

Posted on 13 years ago
#71
Posts: 5550 Threads: 576
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theres a $20.00 supra on feebay

April 2nd 1969 scarfed pink champagne holly wood and 65/66 downbeat snare, and , supra same year very minty kit old pies
66/67 downbeat with canister
Super 400 small round knob
1967 super classic obp





once the brass ceases to glitter, and the drum looses its luster, and the stage remains dark, all you have left is the timbre of family.
Posted on 13 years ago
#72
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I have a shell with a bunch of extra holes I can sacrifice for this great cause.

"It don't mean a thing if it ain't got that swing..."
Posted on 13 years ago
#73
Posts: 977 Threads: 124
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Morning guys -

It seems this has wrapped up, so I'm not trying to wake a thread. It seems that sending part of a supra for spectrometer analysis is a tad extreme since there appears to be a weight spectrum between Luddys & COBs ....

Anyway, I'll watch this for later mystery shattering input -

Happy Holidays! Hobbs

Posted on 13 years ago
#74
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Well since we are awake again...

I've got a question for all those who posted weights on COBs and "plain" Supras:

Are you weighting them whole (including heads, rims, lugs, t rods, strainer, butt etc)?

Or are you removing some parts? If so which parts?

I ask because it seems to be that small variations in weight (which extend the range of what is a "normal" Supra or a COB supra) might be due to just that sort of difference.

Posted on 13 years ago
#75
Posts: 977 Threads: 124
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Well, I weighed with everything set up to play. I suppose weights could be taken of the shell only - but I'm guessing all weights are normally taken w/ heads & rims, snare, etc attached. & I'd wager a guess t/ weights would vary w/in a few ounce range.

H

Posted on 13 years ago
#76
Posts: 5550 Threads: 576
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never mind how much it weighs just play the darn thing

April 2nd 1969 scarfed pink champagne holly wood and 65/66 downbeat snare, and , supra same year very minty kit old pies
66/67 downbeat with canister
Super 400 small round knob
1967 super classic obp





once the brass ceases to glitter, and the drum looses its luster, and the stage remains dark, all you have left is the timbre of family.
Posted on 13 years ago
#77
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The evidence suggests it may be a COS Supra. I may check my '65 supra with a magnet. Weights of various period drums aren't going to be the same because the lug casings and hoops from different periods weigh different amounts. Even if it is COS rather than Ludalloy, rarity doesn't necessarily translate to more value; however, this era is a really good time for Supras. My '65 is probably the best supra I've heard, and I like its sound better than most snare drums I've ever owned.

Posted on 13 years ago
#78
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