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  RT3 Officine Marconi              RSAF (ZENITH)                                P410 (TUNGSRAM)                                                     Diodo TUNGSRAM

      GENOVA

   B406 Philips         E415 Philips           B443 Philips                                B443 Philips           C443 Philips           C453 Philips

               A442 Philips                     E442 Philips  (pentodo)                                                          E442S (diodo-pentodo)

            E424N Philips                                                                  WE27 Philips

     E444 / WE26 Philips                                  E446 / WE23 Philips                               E452T Philips                AF2 Philips

           AK1 Philips                    AK2 Philips                   E443H Philips                  TE.43H (E443H)               E463 Philips 

     AL1 Philips                   AL4 Philips                  ABL1 Philips                     ECH3          EF9              EBL1             WE54

                        505 Philips                             1805 Philips

     AZ1 Telefunken          AZ1 Telefunken   AZ1 Philips      AZ1 Philips                AZ4 TUNGSRAM            PV200/600 TUNGSRAM

     REN804    Telefunken       REN904    Telefunken     RENS1374d                WE13                       WE17                     WE20

                VY2 Telefunken          VCL11 TUNGSRAM           EM1 Mullard           EM4 Philips           EFM1 Philips ( WE 18 )