"Edmund H. Ramm" wrote in message
...
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Are you sure 866s are mercury vapour rectifiers? I have here two
Haltron 866A valves (s/n C8059 & C3926) which look absolutely clean
and dry inside. Lacking data sheets I until now assumed they were
gas-filled rectifiers.

73, Eddi ._._.

3B28 subs are gas equivalents.. 866 are mercury vapor.

Pete