N_Cook Inscribed thus:

That last more than 5 years before the gap in the socket pin opens up
enough to break contact on the grid pin?
octal EL34 type valves seem to have pins about 2.2/2.3 mm diameter.
Failing socket pins , measured cold , a gap in the Y as large as
2.1mm. Luckily I've found a NOS McMurdo , British made socket that I
will rob 4 of the pins from, for the 4 grids, as physically compatible
in the base matrix. These unused ones measure 1.7/1.8mm in the active
part of the Y gap. The failed ones from 2007 have reduced metal in the
region where its required , the 2 prongs , except for a swelling at
the contact point ,
measure in cross-section .7x.9mm down to the 2to1 middle of the pin .
The older ones measure .55 x 1.4mm , the 1.4mm dimension in the sense
that you
want it , for long-term/hot-cold cycling strength.
Any modern makes have engineering drawings disclosing these pin
dimensions ? has the metal composition changed/ trade secret
formulation lost?

Didn't you see my post a while ago where I said I had found a brand new
pack of five !

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Best Regards:
Baron.