McVitie Weston valve collection, National Union valve, type 76
National Union valve, type 76, marked JAN-76 VT-76, pinch marked U/-, (RMW/Y417A - McVitie Weston number), by National Union Radio Corporation.
National Union valve, type 76, marked JAN-76 VT-76, pinch marked U/-, (RMW/Y417A - McVitie Weston number), by National Union Radio Corporation.