Warwick Thumb Bass Pre-amp noise

[goingdownslow]

Haven't used my '90 Thumb Bass for a while and when trying it today, when I inserted the jack plug there was a static type electrical noise, like something being turned on, it lasts two to three seconds and then all is fine. It will do it again after removing and re-inserting the plug. It never used to do this and my other Thumb Bass, a '91, doesn't do it. A new battery doesn't help.

[paul_5]

Is it not just the capacitors/opamp filling up after being empty?

 

[Hellzero]

The output barrel jack may be loose (inside), as it's a typical problem with these.

 

Or it could be what @paul_5 said, so check after a few minutes of playing if it does that static noise again, if not, @paul_5 was correct, if it sill does, get a new barrel jack.

 

Buy these as even the expensive Switchcraft don't last (I've tried so many until I found these that last very long): https://www.amazon.co.uk/Alnicov-Stereo-Copper-Guitar-Cylinder/dp/B08L69K6QH/

 

[goingdownslow]

Barrel jack appears to be ok.
Left it plugged in for 30 mins and it still does it when reinserting the jack.
Disconnecting and reconnecting the battery whilst the jack is in has the same effect.
Doesn't do it in passive mode.
Once it has powered up it is quiet and functions as it should, so I will live with it.

[goingdownslow]

Decided I couldn't live with it and ordered a replacement from Warwick. MEC 60003.
I noticed that the EQ module with stacked pots was available on it's own, M 60904, but it was not much more for the complete set. 
Whilst the cavity was empty I decided to line it with copper tape as I had a coil to hand that was for model railway purposes.

As the Thumb Bass has a separate battery compartment and the the new control harness has it's own battery clip that I did not want to snip off, I soldered another PP3 clip to the original wiring, observing polarity.

Note that in the second picture I have re-done the connections to the barrel jack, they looked a bit flimsy, and put heatshrink on.
The service from Warwick was quick, ordered on Thursday arrived Monday. Total cost £141.60

Edited 3 hours ago by goingdownslow

[tauzero]

1 hour ago, goingdownslow said:

 

Note that in the second picture I have re-done the connections to the barrel jack, they looked a bit flimsy, and put heatshrink on.
The service from Warwick was quick, ordered on Thursday arrived Monday. Total cost £141.60

 

Looks as if you've got enough slack in the leads to the jack socket to be able to pull it out through the body without unsoldering them, which makes life a lot easier when you replace the socket (barrel jacks are a consumable item) as you can solder in the new socket without having to furtle around in the cavity.

[goingdownslow]

1 minute ago, tauzero said:

 

Looks as if you've got enough slack in the leads to the jack socket to be able to pull it out through the body without unsoldering them, which makes life a lot easier when you replace the socket (barrel jacks are a consumable item) as you can solder in the new socket without having to furtle around in the cavity.

The barrel jack is plugged into a socket on the vol control and is easily removable. Undoing the nut is still a pita though.