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I've got a Stage 112 SE in and R75,76 had bad solder joints and were discolored from heat so that I can't be sure of the value. They read around 25 ohms. Neither Fender nor mrgearhead have the schematic. If anyone has the schematic could you please tell me what the value of R 75 and R76 are. Thanks! Jerry
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In the event you don't have a PDF reader, the values of both R75 and R76 are 47 ohm/2 watt.
Regards.Comment
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R74 and R75 are the resistors in the Zobel network on the output. The only reason they could ever fry is if the amp is oscillating or if C49 is shorted.
Fried resistors in this case are only the symptom of some other problem.
Fender has used a highly non-standard power amp setup for some reason; this often makes stabilization trickier.Amazing!! Who would ever have guessed that someone who villified the evil rich people would begin happily accepting their millions in speaking fees!
Oh, wait! That sounds familiar, somehow.Comment
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Thanks for your help. I'm surprised to see this amp on the schematicheaven site as it's a SS amp.Comment
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For an update on this one, it was C42 that had a broken lead causing R75,76 to heat up. The solder joints on those resistors liquified after being on for a minute. I started checking component values and probing and wiggling parts around(with the amp unplugged) when C42 reared it's ugly head and showed one broken lead. The solder joints looked good on the other side and the lead was broken below the surface of the pcb.Comment
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