The unit should be looked at by a tech. Too often something has blown and will cook a brand new set of tubes. It's well worth the $60 for a tech to look at it.
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Well I have a reply from Ayon (they've been prompt which is nice) and they suggest that the KT88 tube may have destroyed a resistor.
So it's off to the factory for service - not me, the amp :)
I guess then they can diagnose if it's the amp or the tubes at fault.
So does that mean the tubes may possibly be fine?
I have ordered a new set just in case.
I will keep updating as soon as I know more.
Personally I would keep the V1 & V4 tubes WHILE ordering another quad. I've had tubes arc over and they usually work for a while. I mean the longest I've had a tube that arced over last for is 4 months before it finally went to tube heaven. In fact that tube (SED 6550 winged 'C') AND it arced over 3 times in 4 months. The fact that you swapped V1/V4 with V2/V3 and the problem stayed with the V2/V3 tubes makes me think you have a tube that will fail again. My Octave has a protection circuit that doesn't take out resistor when an output tube fails.
That being said I would be afraid to put either tube (V2 or V3) back in the amp for fear it may take out another resistor.