Behringer XR18 repair (digital mixer repair).Categories Recent Repairs Tags guitar amp repair, repair, Valve amp Bias, valve amp blowing fuses, valve amp overheating, valve amp repair Post navigation If you have a JCM2000 repair, do get in touch. The lesson to be learned: read my bias FAQ before replacing power valves yourself. I also replaced the burned out suppression capacitor that can be seen in the picture. I replaced this resistor (with a lighter weight, but equally rated component). The amp had become so hot that a screen grid resistor (R78) – mounted upside down in the amp – had melted its solder connection and fallen out of the amp, melting some cabling where it landed. When he paired the valves wrongly things had become hot and smokey – the valves red-plated For more information on valve amp bias, check my bias FAQ. He knew how to bias his own amp and knew about pairing valves, but had always replaced for a matched quad in the past. IIRC, the amp needed new valves and the owner mistakenly paired valves 1+2, 3+4, instead of the correct 1+4, 2+3. I’m writing the blog post quite a while after the repair now, so I’m looking at my notes to remember the issue. This particular JCM2000 is a TSL100, the triple super lead model. I think it’s because they were so popular, rather than any endemic issues. I get quite a lot of the JCM2000 series in for repair – both DSL and TSL.
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