Just bought a Raven 100 watt guitar amp. All I know is that it was a house brand for Guitar Center. Paid $20 for it so the cab and two speakers are worth the price. However I would like to fix it. I turn it on and it does pass a signal however the power amp heat sink get really hot and I think I saw some smoke. Any suggestions as to where to start looking. BTW.... It uses a STK404-100 power amp chip module.
Thanks
Thanks
1) Start by building and using a light bulb limiter Light Bulb Limiter , both to avoid killing dozens of fuses but more important, to avoid burning more and more parts every time you turn it on.
2) That said, maybe somebody has it, or, being a generic OEM product, maybe same schematic under other brand.
3) provide a couple gut shots to at least know what we are talking about, at least a whole chassis one and a closeup of the power amp board.
Make them sharp and well illuminated, any real digital camera will do; phones are not meant for closeups nor have useful flash, so pictures boast about tons of Megapixels but are dark and fuzzy, useless here.
4) absolute worst case, maybe the preamp works (their job is lighter) but the power amp died.
Maybe it can be repaired with a new STK module (although in that case some GC Tech would have repaired it) but if not, you could junk the power amp board and mount a generic 100W board fed from the original transformer.
It involves quite a lot of brain surgery though, and if the amp is a "*everything* in one huge PCB" type it might be beyond hope.
5) even worse (how low can we sink? 😉 ), you might junk the guts, except the power transformer, and mount there a prebuilt 100W module and supply, fed from the original PT, and drive it from some pedalboard, POD or even a Notebook loaded with some simulation software.
You'd be recycling the most expensive part: speakers/power supply/cabinet/chassis.
Not bad for $20 plus some generic EBay PCB.
From what I remember, those amps were reasonably well made and there was ample space available inside the chassis.
2) That said, maybe somebody has it, or, being a generic OEM product, maybe same schematic under other brand.
3) provide a couple gut shots to at least know what we are talking about, at least a whole chassis one and a closeup of the power amp board.
Make them sharp and well illuminated, any real digital camera will do; phones are not meant for closeups nor have useful flash, so pictures boast about tons of Megapixels but are dark and fuzzy, useless here.
4) absolute worst case, maybe the preamp works (their job is lighter) but the power amp died.
Maybe it can be repaired with a new STK module (although in that case some GC Tech would have repaired it) but if not, you could junk the power amp board and mount a generic 100W board fed from the original transformer.
It involves quite a lot of brain surgery though, and if the amp is a "*everything* in one huge PCB" type it might be beyond hope.
5) even worse (how low can we sink? 😉 ), you might junk the guts, except the power transformer, and mount there a prebuilt 100W module and supply, fed from the original PT, and drive it from some pedalboard, POD or even a Notebook loaded with some simulation software.
You'd be recycling the most expensive part: speakers/power supply/cabinet/chassis.
Not bad for $20 plus some generic EBay PCB.
From what I remember, those amps were reasonably well made and there was ample space available inside the chassis.
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