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Old 16th December 2011, 07:12 PM   #171
DF96 is offline DF96  England
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Might do. Aluminium might be OK too. You can think of steel as acting like a pipe to transfer magnetic flux from here to there, thus coupling circuits which are separated in space. Reducing loop area at both ends will help too.
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Old 16th December 2011, 07:20 PM   #172
Magz is offline Magz  United States
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I'll probably end up doing what I should have done in the first place, which is build a separate power supply box using a real center-tapped transformer and diode bridge to supply the +/- 18V required, instead of the wall wart/ voltage doubler setup that came stock.
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Old 13th January 2013, 04:48 PM   #173
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I'd just like to briefly contribute with my little experience.

The preamp i've made was firstly done on a wooden frame with relatively thin copper top plate. Then i changed the top for a thick pine board as the copper and was very touch sensitive (microphonics) and not very stiff because it was thin.

Change in sound was quite apparent and i cannot describe it in terms or good/bad. Surely the first one sounded more metallic with shimmering highs. Not necessarily bad, for example trumpets were amazing, so real. Pipe organs were 'ringing' more. The wooden version removed this bite and made everything more smoothed out and 'theoretically correct' soundwise, more universal, balanced.

Oh and i'm talking about near field listening, no ground shaking stuff.
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Old 13th January 2013, 05:12 PM   #174
GoatGuy is offline GoatGuy  United States
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Of interest - research we did at the materials science lab in the 1970s showed that one of the single most effective dampened plate designs was a pair of thin high-tensile aluminum sheets, as the outer sandwich having a filling of clay-impregnated silicone (setting) putty. Clay about 1/3 by weight. We mixed it using a glazers trowel directly on the bottom plate, then spread it (by trowel) out to about 1 mm thick, as uniformly as possible. To apply the top plate, it was alcohol and methyl-ethyl-ketone cleaned first (as was the bottom plate, MEK from ACE hardware), and very slightly bent into a curved form. Doing so allowed one edge to be clamped down, then the other (curved up a few centimeters) pressed down and again clamped. To cause the silicone to cure, just before clamping, we sprayed it with a woman's perfume atomizer, with ordinary water. Very little. 1/50th the amount of the silicone.

The plates of course overnight were bonded. They became as "dead as lead", yet had the strength and resilience of the aluminum.

Mercedes Benz, Boeing, McDonald-Douglas, Toyota and quite a few Japanese elevator manufacturers consider it now to be their "proprietary/patented" technology. This doesn't prevent it from being used for OTHER purposes though, especially microphonics reduction.

GoatGuy
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Old 13th January 2013, 09:45 PM   #175
Loren42 is offline Loren42  United States
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Aluminum makes a more ringing sound.

Steel, even more so.

Wood makes a dull thud when hit.

Glass makes an interesting sound, but only once.
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Old 14th January 2013, 10:53 AM   #176
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The most ringing, even chiming sound undoubtedly can be expected from bell-founding brass :-).

Best regards!
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Old 14th January 2013, 02:16 PM   #177
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indeed. there is no universal system that can do everything the best. people often talk about 'fidelity', original information on the medium etc.. and it all becomes irrelevant once we want to transform it to mechanical waves.

long ago i experimented with cheap stick-on transducers. in general the complex sound was rubbish of course, but when i put it on acoustic guitar and played Paco de Lucia or even solo violin tracks, it was unbeatable since my guitar physically played it. im still planning to make some dedicated speakers for wooden acoustic instruments as well as for brass, just for special occasions. to some extent its the same for chassis as i see it. but of course, there are many things that 'matter' more for sure.
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Old 16th January 2013, 03:38 PM   #178
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Well, this is not what I meant.

Talking about the "sound" of certain chassis materials sounds more than eccentric, even esoteric to me, as I bet that no physical or chemical parameters related to chassis materials are reliably (!) proven to have any influence on the "sound" of an amplifier at all. A chassis' only duties are to provide mechanical stability and electro-magnetic screening.

Best regards!
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Old 16th January 2013, 03:55 PM   #179
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Quote:
Originally Posted by Kay Pirinha View Post
Well, this is not what I meant.

Talking about the "sound" of certain chassis materials sounds more than eccentric, even esoteric to me, as I bet that no physical or chemical parameters related to chassis materials are reliably (!) proven to have any influence on the "sound" of an amplifier at all. A chassis' only duties are to provide mechanical stability and electro-magnetic screening.

Best regards!
hi Kay,
i was thinking like this for years and i still accent importance of another factors contributing to sound, but we cannot overlook the phenomenon of microphonics, especially with tubes and capacitors. I realized it on my chassis rebuild described above and i wasn't expecting anything sound-wise (i just wanted more rigid chassis) so no mind programming took place. I'm not over-emphasizing it though..
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Old 16th January 2013, 03:58 PM   #180
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Yes! This is exactly what I meant with "mechanical stability".

Best regards!
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