Tubes Asylum

• Re: Do pearl tube coolers work? - Herbie 01:17:03 09/08/03 (0)
  In Reply to: Do pearl tube coolers work? posted by mark damon on September 06, 2003 at 11:52:21:

  I have found that with little or no ventilation, the coolers actually cause tubes to run hotter. With adequate ventilation, they do reduce tube temperature and potentially extend tube life. When they are new, they help reduce microphonics somewhat and sound nice. After several months, though, they begin to sound quite irritating because the o-rings holding them to the tubes get brittle (mine eventually cracked and broke). This was my experience, you might have better luck.
  
  
  

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• Re: Do pearl tube coolers work? - waldenpuddle 22:08:00 09/07/03 (0)
  In Reply to: Do pearl tube coolers work? posted by mark damon on September 06, 2003 at 11:52:21:

  Don't know diddly about extending tube life. Frankly, I didn't really buy them for that. I bought them to reduce microphonics. I have them on the 6SN7, 6SL7 and both 5U4's in each of my Manley Monoblocks and they made an immediate difference (for me) YMMV.

  Unfortunately they don't make them for 300B's (and I would need 4) so I am loking into using the Herbies "Halo's" for the 300b's.

  In any case.....my experience, as well as other people's is that they are a (relatively) cheap and efective tweak. Let us know if you go with them and what the results are...

  ml
  
  

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• Re: Do pearl tube coolers work? - GrayBeard 08:42:12 09/07/03 (0)
  In Reply to: Do pearl tube coolers work? posted by mark damon on September 06, 2003 at 11:52:21:

  Well, I don't know if they extend life through cooling, but I did find them to help reduce microphonics when used in my BAT VK60.

  --Bob
  
  

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• Empircal testing - steve oda 22:06:50 09/06/03 (1)
  In Reply to: Do pearl tube coolers work? posted by mark damon on September 06, 2003 at 11:52:21:

  Mark,

  Probably the best judge for your system is to try them out and tell the board your results.

  Has anyone heard of these things actually harming the tube or shortening its life?
  
  

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  • Mine didn't seem to make any difference but they sure looked cool. nt - Chuck Y 09:58:47 09/07/03 (0)
    In Reply to: Empircal testing posted by steve oda on September 06, 2003 at 22:06:50:

    nt
    
    

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