TUBE SUBSTITUTION GUIDE
CLICK ON THE TUBE RANGE THAT YOUR TUBE FITS INTO THEN SCROLL DOWN TILL YOU FIND A MATCH.
 TUBES 00A - 4HK5   TUBES 6K5 - 10EW7 
 TUBES 4HM5 - 6BQ6   TUBES 10FD7 - 17GJ5 
 TUBES 6BQ6 - 6K5   TUBES 17GT5 - X155