www68

Hi everyone, I have a dual channel 300w/8ohm 15inch bass combo amp (not D-class) - perhaps 6 years old - which I suspect is a badge engineered unit. In Australia it was sold under the brand name RMS Amplification. It has some quality components and features, yet was used for one gig then 'died' and then placed in a shed until it was passed on to me. I'm trying to resurrect it and suspect the power module is at fault. Currently the amp powers up, lights glow, but that's all. Speaker is good, but no signal gets to the speaker, and no signal through the DI output. I have checked the only fuse I can find which is at the power lead input. Continuity along the front panel board is good (input to channel selector through eq, etc), but I wouldn't know how to check the power module board or transformer. I took it to a shop who reported the power module as dead but wanted the schematic before going further. I have spoken to the Aust importer who tried to hunt down a schematic, but the factory will not respond to our requests, and do not keep replacement parts - so that avenue of help is closed. At the moment, if I can find a 300w class D power module and transformer suitable for our 240v, I'd happily swap it over, but the connector to the preamp (front panel) board will most likely be different, and I'm not sure if it would have a low voltage takeoff for the preamp board. Likewise trying to install any other A+B type power module is unlikely to have the connections I want. So - beside turning the cabinet into a passive cabinet, finding a 1U bass head, or screwing in a Warwick Gnome or similar to fill the void, what options would I have to resurrect the head unit? Is there any other trouble shooting tips that I could try (that doesn't involve me going up in a puff of blue smoke)? attached is a pic of the power module (is it usual to use that much hot-melt glue?) in case someone recognizes it - would other bass combo's use one like this? (Behringer? Laney? Peavey?, etc). As seen in the pic, apart from component id's, there is no writing on the powerboard apart from '0704420 2001-0173-4 300w BASS POWER' - which I was really hoping would turn up something at AliExpress or ebay, but nothing... Any thoughts appreciated...... Wayne.

BassmanPaul - why does that trick from Nov 2021 work? I presume you just mean using something like a guitar pedal patch lead? (I have a generic type bass combo amp that I also trying to resurrect - i suspect fried power module, but will try any other trick too)