Lakland 55-01 electronic issues...help

I'm thinking Pre amp is shot! Wiring failed-pots bad, etc. those pres are not much good replace with your favorite flavor.
All my 5501's have nordstrand except one--it's got a Demeter.

 

Well we know There is something wrong with your wiring/maybe blend pot??. Somebody prob tried to fix something-mis-wired, may need pots sprayed --perhaps this was the original preamp and it has been taken out, switched, then replaced
The thing is....Bart Mk1 pickups are not bad quality but the preamps even without wiring-pot issues are pretty bad. Replacing the Pre with a nordy, Aguilar, john east uni, Bart USA, etc will enhance your sound/tone greatly
If you have a knowledgeable tech/repair guy maybe they can fix it for just a small fee. Then decide from there.

God bless. Hope you get it solved!
Laklands are the real deal! Especially those early ones. My red one was a prototype.
Love red!

 

I played your bass! I took my 4-94 to the shop for some care, and while there Dan asked me to play the prototype Skylines!

 

Mine was/is a see thru red 5501---about 8 lbs. the action/playability is ridiculous!!! Now has nordy big singles. Nordy 3 band pre with vtc
It is an amazing bass!!

 

A beauty!!

 

These preamps look like this when not in the bass:

I'd recommend taking off the cover and making sure that everything looks to be solidly connected to the board. Just press the white parts to make sure they are all seated well.
Also, check for any loose wires while you're at it.

If you can't find the issue and end up going to a tech, should they quote you some high price to fix it, I'd say you'd be very wise to spend that money on a different preamp. I've swapped this out a number of times and was really stunned by the improvements.

 

Definitely wired wrong somewhere along the lines of former owner. You can get complete preamp at Dana B Goods online, tell Dana that Mr. Bruce from Cincinnati preferred you! Comes schematics if you how to install and they have great warranties. You can also ship to Dana and you get a reduced rate! Worth checking out. Go to his website and call for more details.

 

Zombie thread!

But that preamp is terrible. If you're going to replace it, replace it with something good. A real Bart pre would be my first choice.

 

No Doubt!!