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300B tube death question........


Has anyone experienced the death of their 300b tube? What happened.....Exploded? Imploded? Awesome fireworks display? I'm just preparing myself for when it happens.

Also, the 300b tubes in my amp is underbiased and it won't reach optimum recommended voltage settings (volt meter should read 700ma but tube is at 450ma). The amps have manual bias adjustments only.

So far nothing has happened and the sound is fine. Should I replace them now or wait until they die? (see above question).

Amps: ASL monoblocks SET amps - (2) 300b per channel
Tubes: Valve Art 300B 98C

Thank you for sharing.
dogpile
dogpile OP
118 posts
 
I think I'll just replace the one tube since the other three are still low hours. The place where I initially bought them cannot take returns which SUCKS! Goes to show, even tubes advertised as NEW can have low emissions. I'll search for a different supplier, perhaps Conus in Canada.

Thanks guys!
swampwalker's avatar
swampwalker
5,138 posts
 
NO return on a defective tube makes them a non-viable supplier, IMO. Sounds like they are using their customers as QA/QC. For 20 bonus points, what large software supplier uses the same business model? Seriously, unless your vendor is 30% lower in price than the competition, then their policy in unsupportable.
johnk's avatar
johnk
1,976 posts
 
Ive had one 300b fail it went microphonic.Had many other tubes fail no problems just replaced tubes
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