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I am not sure what this is, but a little reading tells me maybe 1980's possibly, so I am hoping for some help. It's a 2x12 vertical Slant Half Back. On top where the slant is there is a Black Shadow MC-90 by Celestion at 8 ohms and 90 watts. On the bottom in the closed section is a Black Shadow...

I went to Jam Sunday at a new venue that is small. So, I decided to use 5 watt mode. I tuned on the amp after setting up and warmed her up. After tuning up, I take the amp off standby to do a volume check and get no sound. With all I've been through with my Express, panic set in immediately. But...

In another thread I talked about having issues with my Express where it seems to just lose power and definition. But the problem is tough to duplicate. You have to play for a good two hours and get her hot. We've tried all kinds of tubes from Mesa and now a different speaker. It's kinda like the...

Hi Folks, Been reading here quite a bit since I got my Express 5:25. I have a love hate relationship with it however. Anyway, right now what I'm trying to do is locate the bias resistor for the output tubes on the Mesa Express 5:25. Does anyone know which it is? I can't find a schematic and...