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RE: Now that is a brilliant concept Brian!

Posted by driguy (A) on December 28, 2009 at 15:05:19

In Reply to: RE: Now that is a brilliant concept Brian! posted by bcherry on December 23, 2009 at 16:57:13:

Hello Again Brian,
I just ran across an article in 6Moons about Emission Labs producing a run of 45's in case you are interested. Their 300B XLS tubes are fantastic IMO. The microphonics in the DHT's are a real problem. I mounted mine inside a tall case to help in this regard. I realize that some methods are a little difficult for a production run but I had good success with the following.
1.Herbie Audio Labs tube dampers. 2. Mounting the tube sockets using rubber grommets or washers. If you can make up some washers made of sheet sorbothane it should help even more. 3. Last and perhaps most effective in eliminating both microphonics and RFI may be to have the tubes mounted inside a small size transformer cover (1 each) with vent holes. As the 45 does not generate that much heat a few holes at the top and bottom rear of the cover would do the trick and keep aesthetics intact. No, it is not the same as having them exposed but you still have the rectifier tube there and the possibility of removing the cover and mount if the customers' system will allow it. A good test for RFI seems to be my cell phone. I hope this helps in some way.
Regards,
Tony

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