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WINGED CS BLOWING UP

207.237.92.195

I bought a Cayin a50t last September. I then bought and installed a matched quad of SED Winged C El34s in December from tubesandmore.com. In March one of the Winged Cs started glowing bright orange and making loud popping noises through the speakers. I presumed the tube was a dud and swapped it for another (just under the 3 month warranty).

Now two months later the same thing happened again with another tube. Was I sold a bunch of duds or could there be a problem w/the amp?

I check the bias regularly and keep within recommended range. I notice occasionally the bias may drift outside the range but not too often, and I reset it. If the range is .30-.35 and I set them at .33, should they ever drift out of range? If so, what would cause this?

So my question is, could there be something wrong with the amp that's causing these tubes to blow, or are they faulty tubes?

Follow Ups:

RE: WINGED CS BLOWING UP - Quiet Earth 10:12:21 05/22/08 (0)
RE: WINGED CS BLOWING UP - Caucasian Blackplate 13:49:56 05/13/08 (0)
RE: WINGED CS BLOWING UP - shermanr@prw.net 11:46:20 05/13/08 (3)
- RE: WINGED CS BLOWING UP - rr1405 12:13:11 05/13/08 (2)
  - RE: WINGED CS BLOWING UP - shermanr@prw.net 13:02:39 05/13/08 (1)
    - RE: WINGED CS BLOWING UP - rr1405 16:41:24 05/14/08 (0)
Apparently your amp has a soft-start circuit. - vinylkid58 15:17:07 05/12/08 (2)
- RE: Apparently your amp has a soft-start circuit. - Lowrider 00:58:49 05/13/08 (1)
  - My initial thought was........... - vinylkid58 09:34:09 05/13/08 (0)
My gut reaction to your problem..... - Chuck Y 10:16:25 05/12/08 (14)
- RE: My gut reaction to your problem..... - rr1405 12:24:03 05/12/08 (13)
  - It is more of the tube than just the amp. . . - John PA 13:50:46 05/12/08 (12)
    - Clarification Needed - Larry I 15:03:30 05/12/08 (11)
      - RE: Clarification Needed - Chris O 15:27:38 05/12/08 (10)
        
        RE: Clarification Needed - REL54 16:13:08 05/12/08 (9)
        
        RE: Clarification Needed - rr1405 10:27:45 05/13/08 (6)
        
        I use the DC mA setting on my Multimeter, not the DCV..... - Chuck Y 11:46:42 05/13/08 (5)
        
        RE: I use the DC mA setting on my Multimeter, not the DCV..... - rr1405 12:01:06 05/13/08 (4)
        
        If you mean you just checked using the dc ma setting...... - Chuck Y 13:00:46 05/13/08 (3)
        
        RE: If you mean you just checked using the dc ma setting...... - rr1405 16:37:09 05/14/08 (2)
        
        RE: If you mean you just checked using the dc ma setting...... - Chuck Y 18:26:57 05/14/08 (1)
        
        RE: If you mean you just checked using the dc ma setting...... - rr1405 08:28:02 05/16/08 (0)
        
        check the solder joints on all sockets too... - Jonesy 16:49:03 05/12/08 (1)
        
        Yes, my first thought would always be Chinese quality control! - Frihed89 06:13:08 05/13/08 (0)

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