Telefunken valve, type R.S.5, marked 7813 and with monogram SH, 3-pin base with top screw anode connector, (RMW/J3 - McVitie Weston number), by Telefunken, 1918.
Telefunken valve, type R.S.5, marked 7813 and with monogram SH, 3-pin base with top screw anode connector, (RMW/J3 - McVitie Weston number), by Telefunken, 1918.