

Sorry for my awkwardness, but I don't know how to transfer a scheme to the image of the ampli. I better send you a picture and tell me the points that I have to measure and how. If it seems good to you and it doesn't bother you. By the way, how can you add photo to the message?
What I have checked again have been the transistors, placed on the board, only continuity and there is a BD 709 and a BD 140 that give me continuity, the others well. They are both I believe in the same channel. It may be that they have been damaged when connected to the mains and the fuses have blown or that when they are welded to the board the continuity is not correct. You see, I tell you everything I think can tell you something.
Also tell you that the condenser that had burned is the one that appears in the part of the scheme in position c 1400. I took the burn to the electronics store and nothing was visible and through the scheme I checked that it puts 47 n, and I already bought and install the one it has now, a little smaller, but they told me that it didn't matter. From there, the starter relay started to jump. Then when I put the new transistors is when the fuses blow.
Just in case you solder the bridge diode and retest continuity in the 4700 capacitors. In the photo you sent it must be the rectangular black one. on the bottom. Without the bridge diode it measures again between the terminals of the C of 4700 if the short follows, it indicates a short in the output circuit. You must look patiently for the transistor that causes it.
Okay. I discard the bridge diode, I measure the 4700 again, if they continue to give the same measurement I re-solder the bridge diode, I connect everything and connect to the network and if it continues to blow fuses, transistor by transistor until I find what is wrong inside this same plate . I understood you well, no? Thanks and regards.
Well, after two technicians told me, one that pffff that was very old, that I was more interested in buying another and the other one that good, that I was not sure that it will look good, because you will tell me. Patience ?, There are in abundance here. Thanks again for yours. I soldered the bridge diode and measured the 4700 again, it remains the same. Now, as you say, check all the other transistors. Greetings from Seville.
You do not need to buy all. Solder one by one, noting your number and location. Measure it on a low scale and if it's okay, solder it. If it's bad, make a list on paper and write down the steps you take to avoid mistakes. If you find bad, write it down as bad to look for the new one later
Hello jomi, I have checked all the transistors, there was in each channel 1 defective BC 558, I have replaced them, how they go in pairs I have preferred to put the new ones 4. The fuses continue to blow. I have desoldering the bridge rectifier and checked according to a tutorial and correct. I have tried to connect the 4 connectors on the board one by one. One that is before the bridge, well, another that has 2 pins well, the one on the opposite side of the fountain well, jumps when I connect the one that comes out of the front of the ampli with three red, yellow and black pins.