XForce 1KW supply voltage.

[Jim5570091]

Replaced all the caps on the input side. Only thing I didn’t replace is the combiner. But it seems to test ok.

 

[Monk]

I have tested and replaced everything I can think of except transistors. Is it possible some transistors are shorted and preventing drive to reach other transistors? And how can I test them?

Hi Jim,

A very handy piece of test equipment its a "RF Probe". It takes RF and converts it to DC voltage so you can use your volt meter to trace where there signal stops. I also use it to check multi transistor amps; Key up and use the probe on the input (base) and then the output (collector). This will show the balance of the transistors and also show which transistor is not amplifying.
Not all bad transistors blow by shorting and frying the 10 ohm resistor, some open and don't let out the 10 ohm smoke.
The RF Probe is very simple to build and is worth it's weight in gold if you don't own an oscilloscope. Do a search and you will see there are only three electronic pieces used. A diode, resistor and a capacitor.

https://qrpkits.com/files/RF_Probe_How_To.pdf

Hope this helps
Monk

 

[Jim5570091]

Roger that. I found a video building a probe on YouTube. I built the one in the screen shot. It seemed to show RF on almost every thing. So I ordered a transistor tester also screen shot. I’m going to take all 10 out and test them to be 100% for sure. I don’t mind buying test equipment. I really appreciate everyone’s responses.