similost
Rockin and Rollin....
How to start looking?
Just a little background on this one amp..
It's one of their 8417's that was converted by the factory to EL34's
One amp I've had a slight problem from almost day 1. Some times it doesn't like to put out sound... If I would knock on one of the two large caps, it would crackle and come back. It was only one of the caps that this would work for...
I've been through the amp and looked for cold solder joints and reflowed a few.. It was always fine other wise.. worked and sounded great. Would just drop off every now and then, and a rap or two on the cap and life was good again..
I've got hundreds of hours on the amp like this...
About a week ago, turned it on.. and about 15 seconds later, it popped the fuse. Both of my amps will do this if the speaker wire works loose. I check the wire, and sure enough, it's loose.. tighten it back up, put in a new fuse.. life is good and I listen to it for about 10 hours or so..
A week later, I turn it on, and about 15 seconds in.. POP... check the wires.. fine... move the wires to a new speaker.. power up.. POP..
Now I pop the fuse after the amp is on for about 15 seconds or so..
How would I even begin to troubleshoot what is wrong?
I know test the tubes first.. but I swapped them to the other amp and all is good... If I can't keep the amp on, what and how do I check what?
Just a little background on this one amp..
It's one of their 8417's that was converted by the factory to EL34's
One amp I've had a slight problem from almost day 1. Some times it doesn't like to put out sound... If I would knock on one of the two large caps, it would crackle and come back. It was only one of the caps that this would work for...
I've been through the amp and looked for cold solder joints and reflowed a few.. It was always fine other wise.. worked and sounded great. Would just drop off every now and then, and a rap or two on the cap and life was good again..
I've got hundreds of hours on the amp like this...
About a week ago, turned it on.. and about 15 seconds later, it popped the fuse. Both of my amps will do this if the speaker wire works loose. I check the wire, and sure enough, it's loose.. tighten it back up, put in a new fuse.. life is good and I listen to it for about 10 hours or so..
A week later, I turn it on, and about 15 seconds in.. POP... check the wires.. fine... move the wires to a new speaker.. power up.. POP..
Now I pop the fuse after the amp is on for about 15 seconds or so..
How would I even begin to troubleshoot what is wrong?
I know test the tubes first.. but I swapped them to the other amp and all is good... If I can't keep the amp on, what and how do I check what?