Finally, my beloved Drake R-4C is perfectly working again .
I've found that the third mixer tube (V4) was dead . I wisely checked the circuit and i've found that the Injection signal cross the tube. So i checked if my external DDS I used for like ten days could be the problem and hey ! The output signal was set to +7 dBM ( wich mean about 5mWatt if i'm right ) Bit too much huh ? Many thanks to every gentlemen who "directed" me on what to check . '73 de Adrian iz3svi
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