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Old 22nd March 2013, 10:43 AM   #1541
stajo is online now stajo  Sweden
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It can surely have helped. Isolating vibrations can be counted but its very hard so I usually do trial/error. With bad luck you can enhance microphony if you happen to pick the self frequency regarding to weight and isolation material.
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Old 22nd March 2013, 11:06 AM   #1542
Salas is offline Salas  Greece
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Mesh construction breaks resonance. That is why they made such plates on best DHT power valves versions. Just tap on a window mesh frame. Mute thump-thump.
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Old 22nd March 2013, 03:09 PM   #1543
vgeorge is offline vgeorge  Greece
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Ok, here are the latest findings.
Shaking or taping the box, doesn' t change a thing.
I replaced the choke in one channel with 2X11k resistors in parallel the square wave is perfect.
I am listening what the experts have to say now!
Should I remove the chokes?
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Old 22nd March 2013, 03:14 PM   #1544
Salas is offline Salas  Greece
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Its the choke then, what else. Chokes have habits it proves. Stajo, go knock at Lundahl's door next time you are about, and tell them "I got a friend with a wiggle, have you got a remedy?".
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Old 22nd March 2013, 03:15 PM   #1545
Salas is offline Salas  Greece
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Listen to both R Load and Choke load. The <1kHz sq wave wiggle may prove an insignificant thing when the loading does many other very important things.
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Old 22nd March 2013, 03:18 PM   #1546
vgeorge is offline vgeorge  Greece
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Quote:
Originally Posted by Salas View Post
Its the choke then, what else. Chokes have habits it proves. Stajo, go knock at Lundhal's door next time you are about, and tell them "I got a friend with a wiggle, have you got a remedy?".

This is nothing compared to LL1660 measured response....
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Old 22nd March 2013, 03:18 PM   #1547
vgeorge is offline vgeorge  Greece
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Quote:
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Listen to both R Load and Choke load. The <1kHz sq wave wiggle may prove an insignificant thing when the loading does many other very important things.
Will do some tests and see then. Easy to try.
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Old 22nd March 2013, 03:19 PM   #1548
stajo is online now stajo  Sweden
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Quote:
Originally Posted by Salas View Post
Its the choke then, what else. Chokes have habits it proves. Stajo, go knock at Lundahl's door next time you are about, and tell them "I got a friend with a wiggle, have you got a remedy?".
I can do the underpants grip on him next time, Im about to rip him off some 50 mA 1668s sooner or later. Hey, try some pF-nF caps mr Poros, you might find the resonance.
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Old 22nd March 2013, 03:21 PM   #1549
vgeorge is offline vgeorge  Greece
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Ok, will try that too.
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Old 22nd March 2013, 03:24 PM   #1550
stajo is online now stajo  Sweden
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Found the bestards. Heres what you should use.
Click the image to open in full size.
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