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Flash and thunder when turning on my amp

I recently finished a dual mono 45 SET amp. I have two sets of 45 tubes. With one pair start up is smooth, only a low level hum for about one second. With the other pair (NOS Sylvanias) when I turn the amp on I can see a white flash within the tubes an hear a loud thump on the speakers. Any idea what can this be and why does it happen with one pair of tubes and not with the others?

Thanks,

xavier


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Topic - Flash and thunder when turning on my amp - xcortes 07:11:12 10/26/06 (9)


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