As
the valves are fitted horizontally, I installed some silicon rings on
the ends of the valves to support them. I fitted them in the same place
that the adhesive had been used, this avoided blocking any of the
ventilation holes in the PCB. So they are not really being used for
microphony damping in this location, just used as supports. The
clearance underneath these particular valves is 3.5mm and the silicon
rings are 5mm thick so I cut a small flat in one spot, reducing the
thickness to 3.5 and positioned this on the underside, worked a
treat.
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