McVitie Weston valve collection, S.G. Pentode valve
S.G. Pentode valve, pinch marked F2541, glass loose, (RMW/Y30 - McVitie Weston number), by Unknown maker.
S.G. Pentode valve, pinch marked F2541, glass loose, (RMW/Y30 - McVitie Weston number), by Unknown maker.