Recent content by Fred2202

I got this 50 Caliber+ head all straightened out. Tore out the strange jumper wires and changed several resistors back to stock values. Replaced some of the smaller electrolytic caps and replaced some carbon comp power resistors that had drifted out of spec. May replace the bigger caps...

If you are using Mesa branded tubes you should be good to go. Just plug them in. If you have lingering doubts a tech could probably check that the amp negative bias voltage is still where it should be. It would take a total of about 5-10 minutes on the bench so it should not be that...

Most of the NOS octal rectifier tubes I have seen only had 4 pins on the base. The manufacturers probably saved a few pennies by not adding metal pins that didn't connect to anything. That is not to say some of them could have come out of the factory with all 8 pins in the base. There is a...

If the mm choke is a bigger unit (more Henries) there might be a "slight" reduction in amp hum and it "may" stiffen the power section up a little more and give it a little more punch when you are running the amp hard. Whether you will be able to really notice any difference at all is another story.

Hello everyone. I am new to the forum. I have lurked here at times just to see what people had to say about Mesa amps in general. Always wanted a Boogie Amp and I finally picked up a semi functioning 50 Caliber + last week. Amp makes sound but has multiple issues. I have scratch built and...