Double Bass Stagg EUB stock preamp mod

[DoubleMIDI]

Hi,

trimmers: B50k each
vol: B50k
(sub)bass: B100k

'B': based on the schematic, they're then all LIN.

Bye

Thanks a lot!

 

[336v]

Hello all, new to the forum;

Small correction: value of both potentiometers (volume and bass) is 100k

 

[happygilmour]

By chance does anyone have a working preamp for sale. Mine is shot and I'd like to just swap it out. I'm electronically challeged, so looking for an easy route!

 

[336v]

Great to find this thread. Just curious if anyone traced or drew up a schematic of the original circuit?

Thanks!

 

[336v]

I did.

 

[336v]

Based on the schematic of the preamp, the circuit would be actually quite simple to troubleshoot. But I wonder if you were able to find a replacement, including Stagg possibly selling you a brand new board as a spare part.

 

[bafonso]

Hey everyone, I wonder if you could help me out. I have one of these basses and going to the amp sounds ok but the phones output is incredibly low. It's so low I cannot even hear it with most headphones and only one outputs a super faint resemblance of sound...

I took it out to see if something was terribly wrong but didn't see any obvious damage. I have some diagnostic tools but not super knowledgeable in audio circuits so I don't even know where to start diagnosing. I notice the blue light comes on if I short with my finger the led but otherwise I've never seen it come on...

 

[happygilmour]

By chance does anyone have a working preamp for sale. Mine is shot and I'd like to just swap it out. I'm electronically challeged, so looking for an easy route!

Still looking....

 

[336v]

I bought their brand new preamp from EMD Music Inc (La Vergne, TN) as a spare part - was $46.10 (2022 price). In case you'll ever need to tinker with it, I've traced the schematic of it - attached.