Treble pot signal cut out

[steviedee 16]

Hi I just bought a bass and it’s good but when the treble is fully on or fully off the bass cuts out. It’s active could it be shorting?

Edited May 30, 2020 by steviedee

[ikay 264]

This TB thread is about a similar problem - https://www.talkbass.com/threads/peavey-millennium-bxp-ac-preamp-cuts-out-when-treble-control-turned.1098452/

What make of bass is yours? As a first step it might be worth giving the iffy pot a squirt of contact cleaner to see if that makes any difference.

[steviedee 16]

It’s a Bass Collection, the pots were a bit wobbly and I did use a bit of contact cleaner but maybe needs to be more targeted.

[KiOgon 691]

54 minutes ago, steviedee said:

It’s a Bass Collection, the pots were a bit wobbly and I did use a bit of contact cleaner but maybe needs to be more targeted.

Wobbly? Has the whole pot shifted/rotated and is shorting out somewhere?

[steviedee 16]

2 hours ago, KiOgon said:

Wobbly? Has the whole pot shifted/rotated and is shorting out somewhere?

I think that is possible 

[BassmanPaul 91]

On 30/05/2020 at 09:38, steviedee said:

It’s a Bass Collection, the pots were a bit wobbly and I did use a bit of contact cleaner but maybe needs to be more targeted.

What cleaner did you use? You only should use Deoxit D5 and then only the tiniest amount. Way too many pots have been ruined by the application of 'cleaner.'

Edited June 14, 2020 by BassmanPaul

[BassBunny 448]

If it's an SGC Nanyo Bass Collection, the pre-amps are the weak link. It's 30 years old, or more. I've got 3 of them and have changed all the pre-amps.

Depending on which pre-amp it is, ( I'm aware of 3 different ones ), I may have the values if you need to swap it.

[steviedee 16]

18 hours ago, BassmanPaul said:

What cleaner did you use? You only should use Deoxit D5 and then only the tiniest amount. Way too many pots have been ruined by the application of 'cleaner.'

Just Maplins contact cleaner!

[steviedee 16]

16 hours ago, BassBunny said:

If it's an SGC Nanyo Bass Collection, the pre-amps are the weak link. It's 30 years old, or more. I've got 3 of them and have changed all the pre-amps.

Depending on which pre-amp it is, ( I'm aware of 3 different ones ), I may have the values if you need to swap it.

I'll open it up and post a pic!

[steviedee 16]

[steviedee 16]

Here is a pic of the pre! I opened the bass up and noticed one of the pots was touching the circuit board and another loose pot was causing the board to move when maxed out either way causing it to short.... seems fixed now!

[BassBunny 448]

Excellent stuff. Glad it's sorted.