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Old 16th December 2011, 01:42 AM   #161
SY is offline SY  United States
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The answer to that could fill a book. In fact, it did. Read "Building Valve Amplifiers," well worth the cost.
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Old 16th December 2011, 01:45 AM   #162
a.wayne is offline a.wayne  United States
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Valves ... does that mean it has an steam engine ...... Will give it a look ... Amazon ?
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Old 16th December 2011, 02:50 AM   #163
SY is offline SY  United States
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Yes, you can get it from Amazon. Probably eBay as well.
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Old 16th December 2011, 10:32 AM   #164
M Gregg is offline M Gregg  United Kingdom
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Isolation platform,

Two pieces of glass with bubble wrap in between…LOL
Don’t get using blue or black tack or hot glue under caps…the road to ruin.. LOL


Add some Sorbothane Sheet for good measure....perhaps not...

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Old 16th December 2011, 11:10 AM   #165
M Gregg is offline M Gregg  United Kingdom
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Just for interest,

You can get aluminium sheet with... not sure if its rubber or plastic sandwiched in the middle...no good for heat transfer but I guess another material for chassis bottom that has a damping effect. Quite strong...

I have seen lots of it not sure what its called...

Ummm tube dampers..mount the bases on silicon rubber washers..Then again mount the chassis base plate on silicon washers mount the feet to that...it goes on..

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Old 16th December 2011, 11:22 AM   #166
M Gregg is offline M Gregg  United Kingdom
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Just for interest,

I wonder what the shielding is like with the aluminium rubber sandwich it has aluminium on both sides. If earthed you have a double skin chassis..Phono stages etc...


I still like wood with some kind of metal foil Mu is probably best..or RFI tape..

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Old 16th December 2011, 12:00 PM   #167
M Gregg is offline M Gregg  United Kingdom
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Last comment..LOL

Just my thoughts...Chassis levels Power tx vibration eddy currents etc.

If components are on two levels ie top and bottom I like to ensure some mechanical isolation between ie different materials between bolted sections or some form of damping...gaskets come to mind... or something to stop ringing spreading across the structure. Main thing is to maintain good electrical integrity...and earthing. Passing cables through metal work or ferrite beads<<<if you put a supply cable through a hole in metal make sure the return comes through the same hole...if you don't you will heat up the chassis...Eddy currents come to mind.

I guess everyone has there own Ideas..


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Old 16th December 2011, 12:14 PM   #168
M Gregg is offline M Gregg  United Kingdom
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Just for interest..

http://www.roltesting.com/UserFiles/File/eddy.pdf


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Old 16th December 2011, 04:55 PM   #169
DF96 is offline DF96  England
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Passing flow and return currents through the same hole is good practice anyway, but more important with a steel chassis as the ferromagnetic metal could couple different holes.
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Old 16th December 2011, 07:03 PM   #170
Magz is offline Magz  United States
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I did a lot of work on the LF EQ box for my Infinity speakers and was able to greatly reduce the noise level, as measured using TrueRTA. The noise level nearly doubled, however, when I put the steel lid back on the box; the effect was real and very repeatable, and corresponded to the frequencies emitted by the power supply. I'm thinking that the lid served to increase the noise transfer by induction from the PS half to the EQ half of the box, which are separated with a partition of TI-Shield (see picture). I wonder if making a lid from plastic to replace the steel lid would prevent that effect...
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