Fallout Bass mod to PTB

[ShortscaleRocks]

I completed a mod on my Tribute Fallout Bass this weekend using the wiring diagrams from this site for the L1000. A gentleman from Little Elm Texas, John Wainright, was able to build a stacked pair, 250k/1 Meg R.A., from CTS stock pots. He sells custom pots on Reverb.

What a difference this mod makes to the usabilty of the Fallout!

The one issue I would like assistance in solving is that when the bass tone knob is turned down toward 75% the volume drops dramatically.

Is this a normal thing for the L1000?
If not, any sugestions for problem solving?

Thanks,
Chris

[Ken Baker]

The one issue I would like assistance in solving is that when the bass tone knob is turned down toward 75% the volume drops dramatically.
Is this a normal thing for the L1000?
If not, any sugestions for problem solving?

Nope, not normal.

When you say that the volume drops drastically, do you mean just the low frequencies or the overall instrument? This can be a little tricky because the vast majority of sound from a bass is low frequency, so cutting the bass can seem like a volume cut.

I'll assume you've already quadruple-checked your work.

This has the feel of being the wrong taper on the bass pot. Should be 1MC (C is standard notation for Reverse Audio). Have you contacted Mr. Wainright?

Question: If there was a blue lead coming from the pickup to the cavity, what did you do with it?

Ken...

[ShortscaleRocks]

Hey, thanks for your reply.

As it turns out. All is good.
It appears that there is some interlinking with the volume knob and bass control.
Once I cut back less on the volume than before the mod the issue disappeared.

Also, spent some time on the eq of my rig and pedals for the 3 switch settings.
Bingo! I've found the improvements that I had hoped for going in.

Very usable tones on parallel, single coil and OMG modes.

Thanks for access and use of the wiring diagrams and info regarding caps & resistor values.

If anyone with a Fallout wants to source the 250k/1meg C stacked pots.....
Go on Reverb and Message 'John' at Wainright Guitars asking to have one built and he will set you up with one

[bigtone23]

Hey, thanks for your reply.

As it turns out. All is good.
It appears that there is some interlinking with the volume knob and bass control.
Once I cut back less on the volume than before the mod the issue disappeared.

Also, spent some time on the eq of my rig and pedals for the 3 switch settings.
Bingo! I've found the improvements that I had hoped for going in.

Very usable tones on parallel, single coil and OMG modes.

Thanks for access and use of the wiring diagrams and info regarding caps & resistor values.

If anyone with a Fallout wants to source the 250k/1meg C stacked pots.....
Go on Reverb and Message 'John' at Wainright Guitars asking to have one built and he will set you up with one

Very cool! Glad it all worked out.

Plus, the tip for the custom stacked pot is a good one.

It's moot, as you have your desired result, but I'll share something that looked good in theory and on paper...
https://www.bassesbyleo.com/forum/viewtopic.php?f=9&t=2687
The purpose of the post was to get an acceptable bass cut result with a much easier to find pot. It shows some graphs comparing a 250KB bass cut pot to the 1MC bass cut pot. The 250K at maximum cut is approximately 4 on the 1M pot.
From my experience, that's plenty of cut. FWIW, I rarely set the bass knob below 8, it's typically left all the way up. The treble cut gets some action, though.
The catch for me and my preferences would be that I would want a 500KA treble pot and 250KB bass pot, which is also an impossible concentric pot to find, therefore I would be getting a custom one made, too. haha.

[jglunt2112]

A gentleman from Little Elm Texas, John Wainright, was able to build a stacked pair, 250k/1 Meg R.A., from CTS stock pots. He sells custom pots on Reverb.

Do you happen to have a link to this gentleman from Little Elm, TX?

[Ken Baker]

https://reverb.com/shop/johns-gear-lock ... pping=true

[jglunt2112]

Excellent. Thank you! Always good to have another resource!