fast storage vs. slow storage?

Robert Morein <morepub@...>

The Tek 434 has much slower writing speed than the "fast" scopes.
I notice there was an almost free option to supply a faster writing CRT.
From this, I'm guessing there is some advantage to a CRT with slow writing speed.
Durability, perhaps?
Resistance to burn?
Does anyone have any figures for number of storage hours for the various tubes?

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