Well, i got a used MPA PRO from another user from this site, the preamp worked perfect, but i wanted to change the tubes...
so i got like 20 tubes and started trying, everything fine until... I gound this tube that looks just like a 12ax7 but a little bit longer, put it in, and sounded very nice for about 30 seconds..
After that, the sound is very distorted and everytime i turn it on, the VU meter goes all the way up, sound comes out but again, very distorted and weak, i tried changing the tubes but no luck, the channel two still works perfect.
The tube on the broken channel still lights up normally.
I have fixed a couple of amps before and i built a tube amp before, but i have no experience with preamps like the ART.
I would really Appreciate is someone can help me troubleshoot it or guide to what to look for or what to replace, I really like the preamp and i cant afford a tech to fix it right now
Thanks
Alex
To Make things Cool, im offering a nice, tube present to the person that direct me to the problem and helps me fix it!
so i got like 20 tubes and started trying, everything fine until... I gound this tube that looks just like a 12ax7 but a little bit longer, put it in, and sounded very nice for about 30 seconds..
After that, the sound is very distorted and everytime i turn it on, the VU meter goes all the way up, sound comes out but again, very distorted and weak, i tried changing the tubes but no luck, the channel two still works perfect.
The tube on the broken channel still lights up normally.
I have fixed a couple of amps before and i built a tube amp before, but i have no experience with preamps like the ART.
I would really Appreciate is someone can help me troubleshoot it or guide to what to look for or what to replace, I really like the preamp and i cant afford a tech to fix it right now
Thanks
Alex
To Make things Cool, im offering a nice, tube present to the person that direct me to the problem and helps me fix it!