Eduardo,
Here is some info I've dug up. 2SC2290 was manufactured by Toshiba link http://www.toshiba.com/taec/components2/Datasheet_Sync//63/21686.pdf 2SC3240 was manufactured by Mitsubishi
Turns out that 2SC2290A, SD1487 AND MRF454 are good replacements for 2SC2290. MRF454 is manufactured by MA-COM.
RF Parts http://rfparts.com/transistors.html shows both 2SC2290A and MRF454 as available.
I did not find any information on the 2SC3240 but there might be a close replacement on the RF Parts site.
Regards, Jarek, KB9IIZ
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Hello dears freinds :
I write to you to ask for a big favor. I own an old YAESU FT-747 which final RF
power transistors 2SC2290 or 2SC3240 were damaged.
I have not been able to find them, allthough I have searched ansiously.
A friend of my city gives myself two trasistores of low power and alone I can to transmit with 45 watt in these moments
I need you to help me, for that Radio is my unique HF Station.
If you could help me find the two transistors I would be profoundly thankfull.
Best regards for you and your family.
73.- Eduardo CO8LY