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Old 20th October 2003, 11:39 AM   #1
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Default Silicone High temp O-rings as tube dampers

Has anyone used the high temp silicone orange o rings as tube dampers?
If so are they effective on microphonics? I have tried the tube coolers with zero results. I was thinking of buying some for my 5687 tube as the Tung-Sol is microphonic and the JAN Phillips isn't. The tube measures aprox .798 OD. I was looking at a bag of 50 o rings for $8.95 plus shipping. Yes I know there is someone on ebay selling 8 of them for $8.95 plus shipping. I am looking at the 3/4 ID size in double thickness. These measure .734 ID and I was wondering if that was enough stretch to obtain some results.

Joe
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Old 20th October 2003, 12:28 PM   #2
SY is offline SY  United States
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I've tried them- got mine from McMaster-Carr pretty cheaply. But they're not orange! I've also tried various fluorocarbon rubber rings. They all work some, but not hugely well. You can hear a difference in the quantity of ringing, but the microphonic tubes I tried them on were still microphonic.

At a cost of maybe a buck per tube, sure, it's not optimum but it's something. The real solution is to use less-microphonic tubes, and if necessary, isolate the chassis or the socket subassembly.
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Old 20th October 2003, 02:43 PM   #3
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Good mechanical isolation mounting of tube gear is required ime, more especially pre-amp stages.
Acoustic isolation can be needed to.
Floating the tube electronics on car valve springs is cheap and works quite well.
I have a friend with an all tube system.
Tapping the top panel of the preamp causes a 'dhooomp' out of the speakers, and soft mounting reduces this dramatically.
O-rings will help mid/highs acoustic feedback exitation, and springs underneath will help the lows acoustic feedback situation.

Eric.
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Old 21st October 2003, 01:22 AM   #4
AndyN is offline AndyN  United States
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Default a cheap alternative

Find a "pull it yourself" automotive junkyard and snitch a few silicone o-rings from the headlight bulbs. There is a common "big" size that works well on ST power tubes, and a less common "little" size that works well on 9-pin tubes.

Usual cost: One puzzled look from the guy behind the counter.
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