I recently bought a set of 6550 power tubes that came with tube rings. ARC has long been putting rings on their preamp tubes and there seems to be no question that doing so helps their sound. Has anyone had experience using rings on power tubes? Thanks.
Another vote for Herbie, his rings are very reasonably priced and graded for tube heat. I have had no problems on my 845's and what gets hotter? I am sure someone will tell me.
Well if you guys say so ;--) I have to admit, it's been awhile since I've dealt w/ a lot of hot output tubes (16 x 6550's !) so maybe Herbie is able to offer something more heat resistant than used to be available.
But I still can't understand why one would need dampers on a power output tube -- i.e. unless the tube has internal damage, microphonics shouldn't be a problem in a reasonably vibration-free environment, and adding dampers to the glass envelope would impede cooling and create hot zones. So what would be the benefit? Am I missing something? .
FWIW, I'm with Nsgarch's posts re his actual experiences and the requirements of power tubes, although I've never used Herbies and my power tubes were all common pentodes. No microphonic problems to solve in the first place.
Don't take this as gospel, but I am pretty sure Herbie's offers a 30 day money back on all of their products. I know Steve does with his smaller tube dampers, record mats, etc. FWIW, I have his smaller tube dampers on my amp and really like them.
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