RK75 Raytheon 307A VT-225

This is matched quartet of Raytheon RK 75 (307A, VT225). This
is very rare version of 307A, with just three ribs, all other versions have 5
ribs. This tube is also characteristic for double symmetrical getters.


RK75 Raytheon 307A VT-225 was last modified: May 7th, 2013 by tubes.rs

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