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Posted

Could someone with a Mark Bass Little Mark 250 please look inside their amp, and note down the values, voltage and orientation of the Capacitors

C5 and C6 , located close to the output Transistors . ( or does anyone have a circuit diag ? )

PLEASE only do this if you are competent and safe to do so , make sure the amp is unplugged , and do NOT poke inside .

The Caps should be clearly visible to a knowledgeable person .

Thanks ,

Mike

Posted

I have one of these amps, and I've had the cover off a few times to replace failed/crackly pots in the preamp board. 

 

I'll pop the cover off and take some pictures when I get a moment. These would be the big electrolytic, yes?

Posted

So, I can't get any particularly clear pictures because the flash is bouncing off the other cables and components, but they're both marked as 100uF, 63v, and (I think) rated to 105C, though I can't get a clear look at the last part. 

 

 The person who assembled my amp was very generous with the rubbery fixing compound, so I had to scrape some of that away to see the PCB labels. 

 

Here's the C6 orientation (negative to the right when looking from the front of the amp)

IMG_20250810_163412742.thumb.jpg.7779f6a94fbc44e269bc91993184eada.jpg

And the C5 orientation (negative towards the front)

IMG_20250810_163424037.thumb.jpg.51bfc9d50bd7f6b6467c6cded7eb5f19.jpg

and a fuzzy image of the markings, just to confirm I'm not making this up. 

IMG_20250810_163307992.thumb.jpg.7f78212944805a03df979e0d87a7b39c.jpg

 

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