Quiet Thumper

[Low End Bee]

I've just had a Wizard Thumper put in my 2007 MIA Precision. I got the shop to ditch the S1 and put in a new CTS vol pot.

When I took it to rehearsal I noticed the volume knob on the bass is silent below 6-7/10. At max volume the red clip light on the amp didn't come on until the input was at about 3 o'clock where the original Fender pickup was doing this at just after 12 o'clock.
My DiMarzio equipped Precision clips at about 10-11 o'clock. I was expecting this to have a similar sort of output.

That said it sounds lovely. With more of a thicker warm P Bass tone than before.

Have the well known guitar shop in Kew done something wrong. Is it a faulty pot/wiring. Or is it the pickup?

I'm rubbish with electrickery me.

Edited November 5, 2009 by Low End Bee

[wateroftyne]

Hmm.. I'm not technical enough to suggest anything other to say that the Thumper in my P had a stupid amount of output compared to a standard P...

Hope you get it sorted soon.

[Hamster]

If you're happy to pop the pickguard off, what numbers are written on the pot they've put in? - also perhaps take a photo to put in your post?

[7string]

Do you know what type of pot it is as there's linear and audio taper.

An Audio works gradually as you turn the knob, a linear pot has all the action happening nearer to full.

Have a look at your receipt or have a look for an 'A' or a 'B' on the pot itself.

[Low End Bee]

I've whipped the pickguard off.

They've put a 500k pot in place of the 250k Fender S1 original. The only lettering I can read is '0924 CTS' the rest is obscured by a bird poo of solder. The receipt just says "CTS pot"

[Deep Thought]

I did a very similar thing with my '07 S-1, except I had a SD Quarter Pounder put in. My MIM P has a Thumper in it, and I have to say the SD was always noticeably louder. The Thumper isn't quiet enough to be a problem, it just needs the amp turned up a bit higher than the SD did, but it was certainly not as loud as I was expecting.

[BOD2]

Any chance of a photo or two of the wiring ? That might help check to see if it all looks right.

[Low End Bee]

Photos up tomorrow. Mrs LEB has the camera on a jolly tonight.

[Low End Bee]

In the end I took it back to Chandlers.

The 500k algothingy pot was swapped for a 250k linear and the measured 13.2K thumper is pumping out as it should now.

They were actually very good about it and did it on the spot. Happy now

[wateroftyne]

Get in!