Save your money and get these, not too tight just a snug fit, measure the diameter of your small and big tubes and reduce it by 2mm for the ID of the o-rings needed, for them
They are high temp very high quality silicone o-rings, for industrial purposes. They stop the thin glass of todays cheaper Chinese/Russian tube from ringing, they WILL NOT! stop a faulty tube that has gone microphonic, neither will any other tube damper.
BTW!!! There is no such thing as overdamping the glass envelope of a tube
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=red+silicone+o+ri...
Cheers George
They are high temp very high quality silicone o-rings, for industrial purposes. They stop the thin glass of todays cheaper Chinese/Russian tube from ringing, they WILL NOT! stop a faulty tube that has gone microphonic, neither will any other tube damper.
BTW!!! There is no such thing as overdamping the glass envelope of a tube
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=red+silicone+o+ri...
Cheers George