TNT-1500 problems

[DIRTYWHITEBOY]

This 100Ohm is grey. I had to change it. The old one was smoking a little bit. Perhaps the combiners are also not exact on impedance?

Smoking combiner resistors show an imbalance or usually a blown rf transistor

 

[DD2ML]

Yes, I think it´s an imbalance cause I measured the current of the 4 pairs and it´s all the same so the TR´s might be ok.
Bad combiners perhaps?

 

[DIRTYWHITEBOY]

When a combiner resistor smokes one stage is producing more power than the other,this is what causes the resistor to get hot. you have 2 100 ohm resistors on the combiners where the 2 transistor stages are being tied together,which one of these is getting hot? also check your 10 ohm swamping resistors on bases of all transistors.

 

[DD2ML]

There are 3 output combiners. 2 for the 4 pairs and behind the 2 combiners and the last one is getting hot. You see it on the pictures were the coil is soldered.