I was given a Marlborro (Sound Works) Model SRA920, made in the USA, 6 channel PA head by a buddy for parts. I hate to strip it for parts if I can save it, but it needs the power transistors replaced and I can't find any info on them at all. Actually, I can't seem to find much info on Marlborro amps/heads at all, let alone schematics, parts lists, etc. Which brings me here. The Power transistors are NPN TO-3 and have the following markings: S, Marlborro M18-325, 8210. The M18 may actully be M78, as I can't tell if it's a 1 or 7. Any thoughts on how to determine which power transistors I should by to replace them?
Thanks...
Thanks...
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