My take on the BeePre

[johnsonad]

It does if you let it sit too long.  I removed it after 30 minutes or so. It didn't have enough time to stick well enough to remove paint or wood. 

[adamct]

Thanks.

[HF9]

Teflon tube sockets might help. They absorb some degree of vibration more than their ceramic counterparts. The latest Teflon sockets coming out of China don't have those little nuts that get loose over time, which is nice.

[johnsonad]

Thanks but no thanks. Teflon is pretty hard and those sockets are not the easiest to work with. If my voice from 6 feet away can cause the heater elements to vibrate, I highly doubt an expensive fancy socket will do anything but look nice. Thank you for the suggestion though.

[Grainger49]

Aaron,

Sounds like you need to use your "inside voice" around the Bee Pree.

[corndog71]

Maybe you need to create a box with a good 6" of foam inside to encapsulate the BeePre.  You could always put in a tiny camera and connect it to your tv so you can still see the BeePre.

[johnsonad]

Grainger and Rob, thanks  .....  I am very very happy with the BeePre but am always trying new things. This is a small issue when compared to how good it sounds

[Doc B.]

The ultimate solution is to put the electronics in a different room than the speakers. Fixes resonance issues and heat buildup in the listening area. Of course almost no one has the space to do this.

[Paul Birkeland]

Thanks but no thanks. Teflon is pretty hard and those sockets are not the easiest to work with. If my voice from 6 feet away can cause the heater elements to vibrate, I highly doubt an expensive fancy socket will do anything but look nice. Thank you for the suggestion though.

Is this with both the EML's and the EH's?

[KevO]

The Electro's are microphonic in my BeePre when I am withing 3 feet and speaking loudly. The Vikem rings help.

The Sophia carbon plate tubes are almost as microphonic as the Electro Harmonix.

My Beepre has teflon sockets. Teflon has some internal damping properties,, but it is still pretty hard. Not cost effective IMHO.

I was thinking about glass cylinders to surround the tubes. Some small rubber feet to raise it a 1/4 inch off the chassis. Chimney effect should keep things cool.

I'll see if I can source something the correct diameter.

-Kevin

PS Vikem rings are available on Amazon. Good prices.

[johnsonad]

Yes PB, worse so with the EH's. The more microphonic the tube, the worse it is. Like Kevin stated, I need to raise my voice and the closer I'm to the preamp, the more it transmits it.

Kevin I like your train of thought. I would like to find something that would be excited first, minimizing the transmission to the tube.  What about a loosely formed cylinder of a thin metal?

[corndog71]

Acrylic tubes can be cut to size and may have better damping properties than a glass tube.

[Paul Joppa]

Any air leak large enough for cooling will let most of the sound energy in, I suspect.

Until someone designs and conducts a suitable experiment, we don't know whether the tube or the chassis plate is responding, and hence whether or not a vibration-isolated socket will be of use.

[johnsonad]

Thanks for the encouragement Paul 

[johnsonad]

A short update.  I went ahead a swapped the 300 Ohm resistors for the 10H chokes that Xavier is using.  They have some break in (around 10 hours) and to be honest, I hear no change from the resistors.  I was lazy and haven't measured PS voltages after the change.  They get hot to the  touch after a few hours of use but so far so good.