Re: Cold and valves
I've had the odd valve crack and go to air in Tek 500 series scopes over the years, see the latest, an ECC83 & ECC88 out of a 533A. The ECC88 has several big cracks, they seem especially prone as I've had more 88's go to air than any others. These being in the valve bases in a scope in a shed.
Never had an octal go to air or bigger OP valves.
Andy.
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