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RE: New 6H30s malfunction after 300 hours?

I am FAR from an expert on tubes but I do know one thing. A lot of new gear really pushes those tubes HARD! This may be the case where you need a particular 6H30 that is more durable.

My Conrad Johnson preamp can only take two 6922s being it runs them hard. If I put a nice expensive vintage tube in there it will cook in a matter of weeks. that may be what's happening in your preamp. Much like my dreams of rolling in nice NOS tubes in my CJ will never happen, you may be in the same situation. A limited number of 6H30s to choose from.

Contact Jim McShane and see if what he says and if he has a more durable tube.

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