Why do my tubes keep blowing?

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Hi
Would anybody have any answers to the following?
I purchased a brand new Jadis DA8 Valve power amp. After a few weeks there was a crackle and bang and a valve went( right channel ). The amp went back to Jadis who could find no fault with the amp other than the blown Valve. They sent another brand new replacement. Same happened again. Off it went back to jadis same result as last time. They decided to send another new unit. In the meantime I borrowed a used AR Vs110 and after a couple of weeks the same thing happened to this amp.
Something has got to be wrong at my house, I have had the voltage checked etc can not find any problems. The amp has its own seperate ring main.
In summary the dealer and everyone is scratching there heads. I have taken delivery of the 3rd amp the tube lasted 3hrs then went pop.
Any ideas or posible solutions would be much appreciated.
Thanks

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Topic - Why do my tubes keep blowing? - occ 01:51:54 12/07/06 (9)

Maybe the speakers or wires are shorting? - Goneill 02:55:27 12/08/06 (0)

Re: Why do my tubes keep blowing? - Seán 10:37:04 12/07/06 (3)

Re: Why do my tubes keep blowing? - occ 00:58:30 12/08/06 (2)

Re: Why do my tubes keep blowing? - corerosin 10:12:55 12/08/06 (0)

Re: Why do my tubes keep blowing? - Seán 07:26:43 12/08/06 (0)

In situations like this.... - doodlebug 08:09:43 12/07/06 (0)

I'm stumped. - Will shade 05:51:01 12/07/06 (2)

You may want to try an AC regulator - kstagger 06:33:22 12/07/06 (1)

Spikes due to unsuppressed inductive device nearby? - Ray Moth 12:33:38 12/07/06 (0)

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