[Elecraft] dead transistors at the K2

[OE5CSP-Chris]

afu-dg3oo wrote:
> 
> Hi,
> I am using here an K2, serialnumber about 3000 and more. Yesterday i tried
> to tune. The effect was: no power output at each qrg. Than i solder out
> the Transmittransistors 2SC1969 and checked with an ohmmeter the routes
> Base - Collector, Base - Emitter and Emitter - Collector. In one way
> Emitter - Collector i measured at each transistor an resistor about 30
> ohms. 
> Now i do the same with drivertransistor 2SC2166 and i got the same effect.
> They all died! Now i checked the predrivertransistor. oh well, he is
> living.
> But i dont know, how i killed the transistors. the cause or reason ist
> unknown. 
> Then i bought in the local elektronikshop for little money new transistors
> with the logo from mitsubishi. Then i called via phone the elecraft
> distributor in germany and he told me, that most of these transistors are
> fakes.
> That is the situation. 
> DG3OO
> manfred
> 
> 
> Lieber Manfred!
> 
> Du brauchst die original Transistoren von Elecraft.Hatte das selbe Problem
> wie Du!! Europäische Mitsubishi Transistoren funktionieren leider nicht!?
> Als ich die Schrauben etwas nachgezogen habe, um die Pfeifstellen
> wegzukriegen(ist mir nicht ganz gelungen), habe ich auch die Schrauben der
> Endstufentransistoren etwas zu stark angezogen(ich hätte besser vorher
> noch einmal das Manual nachlesen sollen),und damit die Transistoren
> ruiniert!Erst die original Transistoren hauchten in den K2 tx wieder Leben
> ein.
> 
> 
> 
> 
> vy73 Chris-OE5CSP
> 
> 

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