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I couldn't tell you what they are using in the KL-503. I sent RM Italy an email a couple weeks ago asking them, and here is their reply. Of course they are in Italy, and the English translation is not great, but here is what they said:



Dear sirs, we usede N.9  special transistors make for us!! Regards rm@rmitaly.com

------Messaggio originale------

Da: Jim

A:rm@rmitaly.com

Oggetto: KL-503

Inviato: 28 Set 2010 07:26


Hello,


I am interested in buying one of your new KL-503 amplifiers. Could you

please tell me what type of RF transistors are used in this unit, and how many?


Thank You,

Jim