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Ok best I can get it to is Input = 8.7W @ 1.4:1swr Output = 93W @ 1.06:1swr It does peak at 101W initially but then drops to 93W The new one I tested was about 125W output using the same rig to drive it.

Hi, Just posting a follow up to this. Looks like I have got this amp up and running again now thanks to the posts on here. I replaced the caps C30 through C36 and that seems to have worked. I get 1.5:1 on the input now (which is consistent with the known good unit). And 105W on the output...

I do have a bag of replacement capacitors, hopefully I've bought the right specification ones. Looks like I'm going to have to try them one at a time and see which one (if any has failed) I don't have any replacement chokes to try, not sure what the correct values are as no values are given in...

Thanks for the replies. I made sure to replace the failed transistors with the same make and model (Toshiba 2SC2782) and I made sure to buy a matched pair too. Only reason I detatched C1 was just to isolate that part of the circuit and eliminate it from being the cause of the problem...

Hi, I'm new to the forum. There seems to be a lot of people here with experience of RF power amplifiers and I was hoping someone might be able to give me some pointers. I have an amplifier which is not working properly. With 10W going in it should output 125W (as compared to a working amp) this...