On Oct 29, 7:33 am, "N Cook" wrote:
Ideally identifying which and dismissing the roady would make more sense for
this locally based, but made big-time band.
Failing that - concerning cut grommets encircling valves to act as retainers
in inverted amps. Lining the holes in the chassis where the valves pass
through .
a/ fairly rigid rubber of otherwise standard trunking grommets
b/ fairly tight to the glass envelopes to function as retainers.
c/ obviously they do no take much a jarr to cause breakage as no obvious
damage to the cab.

The 4 o/p valves have spring retainers.
One of the ECC83 quite neatly split in a ring where the grommet lies and
white cap.
I am thinking of running my plaited, high temperature silicone cord "rope",
over the tops of all 6 of these small valves , located over the top "pips"
and anchored to the chasis at the ends.
Any comments pro or con ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

I had an AC30CC in recently. I don't like how they did that grommet
thing on the preamp tubes. They really don't do *anything* besides
provide damping to the glass envelope. What I would do is enlarge the
chassis holes and put in larger grommets. Make sure the tube can be
worked out of the socket with the grommet in place...don't go too
small. Then the idea of strapping them down with some sort of retainer
isn't a bad idea as long as yer in there.