My take on the BeePre
- Thread starter johnsonad
- Start date
johnsonad
New member
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
New member
Aaron,
Sounds like you need to use your "inside voice" around the Bee Pree.
Sounds like you need to use your "inside voice" around the Bee Pree.
..... 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 
johnsonad said:
Is this with both the EML's and the EH's?
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.
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
New member
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?
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?
Paul Joppa
Moderator
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.
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
New member
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.
johnsonad
New member
It's been a while since my last update but I'm continually impressed by this preamp! Today I decided to give the Dynamat Extreme a second chance as I'm running out of things to tweak and I had nothing better to do on a holiday morning. This time around I put at least two layers on as much surface area as I could to include the inside if the base. Well I'm happy to report that there is a small improvement to ring decay both in length and frequency. The ring is shorter in duration and has less high frequencies to it.
This has been a very interesting read. The nearest valve connection for me is that I have been running a pair of Quad IIs for many years. They are currently having a rest, with a Luxman L30 doing duty at the moment. You say you're running out of things to tweak so I wonder if you would consider doing a complete volte face and see what seating your BeePre on a very lightweight stand, maybe just a slab of polystyrene, as a test. A light table is considered ideal for sprung turntables and might also present your tubes with a fundamentally different set of vibrations. Consider it a low cost experiment?
