[time-nuts] 5065 SRD's - Some notes about A3 Multiplier Ass:y

Ulf Kylenfall ulf_r_k at yahoo.com
Thu Aug 30 10:59:21 EDT 2018



       
 
Gentlemen,
Some days after I fired up my 5065 after initial repair of the RV Cavity,it became unstable and lost lock.
No output signal from the A3 Multiplier Assembly.
Q9 (final) was dead and was replaced with a 2N5109to which I added a thermal pad between the case and the PCB.
Q5 had also failedand was replaced with 2N4416. (can to GND-plane)
Q7 was replaced with BC557. (Long shot - RF PNP are hard to find today...)and it worked.
Q3 identified as 3N128 in my schamatic drawing commentsbut I don't remember if I ever replaced that one too.
And while the module was opened, I also replaced C37
I noticed some stability problems while trouble-shootingand the cause of this was loose screwsbetween the "Front panel" and the circuit board/screen walls.

All the Best
Ulf KylenfallSM6GXV





 

   


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