[AMRadio] ceramic tube shields

I ahve seen some ceramic minature tube shields for sale. Does anyone haveany experiance regarding these? How would they compare ot regualr aluminum or ierc shields? __ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.y

[AMRadio] receiver performance nd tube microphonics

An audiophile friend gave me some tubes that he couldn't use in his preamp because they exhibited microphonics. Is it possible to use them in rf and if stages without degrading performance in a receiver? __ Yahoo! FareChase: Search multiple travel