Recent content by olahak

Hello everyone! I forgot to write back to you after I got the new inline connectors and soldered them in place. I soldered the pins one at a time and on different connectors so it had time to cool off. Now it works like a charm, not a problem since! Thanks so much a all of you for the...

I think he meant the tubes ☺️

Thank God for your superb knowledge. I have ordered 13-pin connectors both female and male that I'm gonna solder in when they arrive. When I looked closer into the picture of the board I noticed that pin 4-6 looking burned. I have zoomed in on the picture here.

If I sum up all of your answers it seems that it most likely is a bad connection in the inline connector either female or male. What is strange is that everytime the problem has occurred the unit has been cold. Only one time the two tubes has died during use.

According to the schematic and the physical board it seems that the power tubes gets feeded in pairs. Look at the picture I posted now with the power tube board removed. There is J10 and J11 connectors.

The same two tubes stop glowing. I put in brand new tubes yesterday. Worked fine, same brightness on all filaments with light blue color inside the bulbs. Today when I fired it up the two didn't glow.

Thanks for the answer! I have resoldered what I believe the whole chain. After that it worked, 'til it died again. The problem is that I don't really know how to measure bias.

Hello everyone! I have a problem with my Ampeg V4BH. Two of the power tube filaments doesn't light up sporadic. Sometimes I can play for over an hour on rehearsals without any problem at all several times. But the next time I power the amp up the two power tubes to the left (seen from the...