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RV218 and KL70504 (6)
January 2nd, 2018 12:00
A nice comparison between mesh- and solidplate, directly- and indirectly heated rectifiers.
From left to right: RGN4004, UU5, unknown (British?) and 2B-400.
Valve rectifiers
So, the unknown (probably British made) is the indirectly heated mesh-plate rectifier. The 2B-400 has nickel-plates. See below for some details.
RGN4004 rectifier
UU5 and 2B-400 rectifier