Tube dampers?


My system consist of Shanling STP 80 and T200 cd player, I have been looking around for tube dampers and I found some o-rings and other types of dampers, dont know which ones will work better for my setup since my El 34 electro harmonix and WE 396A/GE 5670W have a metal type cage around them so I dont know if I will have enough room to play with when it comes to tube dampers. I did look into Brass, O-Ring and Herbies type of dampers however I dont know much about any of them. Any advise?

I've heard about ARC, Herbies, Mapleshade and other vendors, some cheap and some $$$ If you recommend a product please please provide me with a link so I can lookup the information. Not looking to break the bank but do some worthwhile improvements.

Thanks, Robert
chgolatin2
"Doesn't the tape hold heat in?"

You have to see it. It is more like very thin ribbon.
Caused no heat problems that I was aware of and is apparently a common tweak.

It made a positive difference for me on my phonostage.
Is there a placement position for the Herbie tube dampers that seems to work best? I read that somewhere between mid-way and higher seems to be best. I haven't really experimented all that much with their placement. Thanks for any suggestions
Has anyone tried the brass damper and the Herbies to see what differences there might be?

I have seen that Mapleshade sells some brass ones, but I also wander about the heat issue. Mapleshade claims they help dissipate the heat.