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"various sizes available to fit most valves" - Do they do EL34 size in that?
"Not recommended for valves which get hotter than 250c." - is this OK for a EL34?
Or you could buy them from here at about 20% the price:
https://www.polymax.co.uk/o-rings/rubber-silicone-o-rings/
If you mention in the notes what valve it's for they'll send the right sizes.
Or give the bloke a call and tell him what you're after.
Ive got two rings on most valves in the combos.
Like putting a cloth on a glass would stop it resonating if you hit it with a fork
I'm a bit skeptical myself but I guess thats the theory.
I've used them for years
I assume it's the resonant frequency of the glass tube or the filament structure - adding dampers around where the metal structure is, and sometimes also a quarter of the way in from the top and bottom does work
That's exactly the case for my rattly valve. Playing C# (fairly loudly) creates the resonance
Result.
Thanks.
viton takes a bit more heat
some output valves run a bit hotter in some amps
fatter rings (more cross sectional area) do a bit more, but are tighter and cost more
Andy