Quote:
Originally Posted by GrimJosef
"The electrode structure has been made particularly rigid to keep the microphony of the valve to a very low level. There are no appreciable internal resonances below 1000 Hz, the vibration at higher frequencies being effectively damped out by the chassis and the valveholder."
GJ
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That is probably why EF86's give little trouble in phono preamps. All the ones I have had have had no issues with microphonics, and no soft mountings were used. I also found the 5879 equally good. So it might be an idea to have a valve intrinsically good in this respect and go for rigid chassis mount than a valve with difficult resonances that needs to be hidden away heating itself up in rubber sleeves and soft mounts.