Posted by Stuben (A) on June 30, 2009 at 16:10:15

Guys,

I have recently completed a 5687 linestage CCS loaded parafeed. So far it has yeilded steller sonic results with the exception of microphonic nature of this valve. I was warned...

Problem:

While I was tinkering with the opt connections, I inadvertently pumped things up slightly above 400v..(it helps to connect the plates) ;>]

Basically one of the CCS stopped loading. I replaced it and carried on listening but I'm getting hashy sizzle crap from the other channel. Has anyone else has a similar experience.

Stuben

• RE: Hash / sizzle with CCS - Dave Davenport 16:44:38 06/30/09 (5)
  In Reply to: RE: Hash / sizzle with CCS posted by Stuben on June 30, 2009 at 16:10:15

  The sizzle crap is a symptom of a defective CCS.
  
  Vacuum tubes are pretty rugged compared to solid state devices, which won't stand any abuse.
  
  Dave
  

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  • RE: Hash / sizzle with CCS - Stuben 18:39:49 06/30/09 (4)
    In Reply to: RE: Hash / sizzle with CCS posted by Dave Davenport on June 30, 2009 at 16:44:38

    Thanx Dave,
    
    I now have a channel out. I have noticed the spooky nature of our SS friends ..those who load soo artfully...not sure they're worth the trouble. I'm looking at choke prices....
    
    Stuben
    

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    • RE: Hash / sizzle with CCS - KevinC 18:45:47 06/30/09 (3)
      In Reply to: RE: Hash / sizzle with CCS posted by Stuben on June 30, 2009 at 18:39:49

      The only problems I've had with DN2540N5-based CCSs have been overvoltage failure and overheat failure. The overvoltage problem has been virtually eliminated with the use of the 1000v IXYS MOSFETs and the overheat problems shouldn't be an issue with careful engineering. However, I'm quite happy to sell you plate chokes if you want them. ;=))
      
      Kevin Carter
      K&K Audio
      www.kandkaudio.com
      
      

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      • RE: Hash / sizzle with CCS - Stuben 14:59:36 07/01/09 (1)
        In Reply to: RE: Hash / sizzle with CCS posted by KevinC on June 30, 2009 at 18:45:47

        Kevin,
        
        Thanks..I'm impressed with the personality of these devices. I've had instances where a channel stops loading and I'll pull it out, apply a 9 v battery and it comes back to life, I lost a channel last enening after an extended listening session. The channel comes back after cool down. I'm running 3 watts with a small sink.
        
        At the end of the day, the ability of the these devices to load a valve is incredible. I like to tinker...I'll hold off on the chokes for now ;> }.
        
        Does the IXYS device offer any sonic differences?
        
        Chris
        

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        • RE: Hash / sizzle with CCS - KevinC 16:03:42 07/01/09 (0)
          In Reply to: RE: Hash / sizzle with CCS posted by Stuben on July 01, 2009 at 14:59:36

          3 watts with a small heat sink in free air is fine. Inside a chassis, it's probably a bit under sunk. That could be your issue. The IXYS devices are clearly superior from a sonic standpoint. That's why when I had auditioned them, I changed the kit to feature the IXYS device.
          
          Kevin Carter
          K&K Audio
          www.kandkaudio.com
          
          

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      • RE: Hash / sizzle with CCS - AnandR 11:35:14 07/01/09 (0)
        In Reply to: RE: Hash / sizzle with CCS posted by KevinC on June 30, 2009 at 18:45:47

        Finally, the salesman in Kevin comes out, albeit with some cajoling needed after all these years...
        
        :-)
        
        Anand.
        

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