816 too( and you'll need two of each in either case).866a
Without Hg vapour, there are lots of damper diodes like 6AX4 that will tolerate PIV quite well enough. 6W4, 6AU4 too and all are octal of the same pin-out, though with nearly 2:1 difference in heater current. See TDSL for data.
cheers,
Douglas
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