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RE: A tube journey with lesson learned, Re; KT88 & KT150

They would have to change the entire design of their amps to do that.
The screen grids on sweep tubes are no higher +ve than 175-200V.

FYI both David Berning (EA-230) and Paravicini used sweep tubes often with screen grid drive.
They are a class act in linearity and longevity, something which any Chinese or Russian device won't even come close to.

FYI.
I have seen Quicksilver make glaring elementary errors in their amps which resulted in the immolation of large nunbers of the 8417 valves in those based units - totally unnecessarily it turns out.
I can only imagine they never read the original docs from Westinghouse or the tendency for large audio signal tubes to self bias and runaway.

The sweep tubes have HUGE cathodes which take lots of heater current.
They are capable of delivering over 1 amp as a result and lots of them still won't start glowing red until you start pushing anode diss to well over 80W-90W.
Just saying.

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