luisfpr Posted November 12, 2023 Share Posted November 12, 2023 Hi there I've got an used RSB bass and I love it, serial 06513923, 2 active pickups, 1 vol, 1 bal, 1 tone, but the tone pot doesn't work. I supose the previous owner modified the factory wiring, and I can't find an appropiate diagram in order to restore the original wiring. So, what can I do to find a correct wiring diagram? Actually, I use the amp tone pots or the pedal board to get the appropiate tone for each moment, but I really need to set the bass to factory wiring. Any idea to help me? Thanks a lot from Spain. Luis Quote Link to comment Share on other sites More sharing options...
BassBunny Posted November 18, 2023 Share Posted November 18, 2023 (edited) Hi Luis, there doesn't seem to be much information about the electronics in these bases at all. It appears they have a passive tone control, same as Fender Precision or Jazz, so replacing the potentiometer and capacitor is an easy fix. Could you take a picture of the whole of the control cavity so we can see exactly what is in there. Edited November 18, 2023 by BassBunny Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 20, 2023 Author Share Posted November 20, 2023 Hi there. There goes the pics. I've made some mods, with no results. Vol and tone pots are Alpha 25K, now, with a capacitor 0.1 uF. The wires now are: from blend pot to vol pot. From vol pot to tone pot. From tone pot to jack. The tone pot still doesn't work. Blend and vol works properly. There is a kill switch to save battery when the cable is plugged, very useful during the discussions in the rehersals session. Kind regards Quote Link to comment Share on other sites More sharing options...
sandy_r Posted November 21, 2023 Share Posted November 21, 2023 On 12/11/2023 at 10:52, luisfpr said: Hi there I've got an used RSB bass ... 2 active pickups, 1 vol, 1 bal, 1 tone, but the tone pot doesn't work... I can't find an appropiate diagram in order to restore the original wiring... So, what can I do to find a correct wiring diagram? Actually, I use the amp tone pots or the pedal board to get the appropiate tone for each moment, but I really need to set the bass to factory wiring. Any idea to help me? ... hi you may be looking for something similar to this: 2×active pickups, VVT, 3-way selecting P1, P2 or both, stereo jack switching power on/off If you're certain that your bass was originally Vol, Bal, Tone you should be able to adapt this circuit (ie. change 1 Vol into a Bal) Use a wire-colour scheme which is different to the pickup wire colours, to avoid confusion (for you and 'helpers') when trying to decode the wiring If you added the (non-standard) 'kill-switch', then you have a choice: remove it, change it into the pickup selector shown here, or leave it as an extra power switch. Your call NB. If your wiring cavities are fully shielded (and grounded) just use the relevant pot (& jack shield) lugs as ground connections - soldering the pot cases just wastes solder, increases probability of dry joints and can cause heat damage to those soldered parts good luck Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 22, 2023 Author Share Posted November 22, 2023 Thanks for your info. I've got some news! The tone pot seems work, but not all amps can detect! So, Maybe the orange drop capacitor 0.1 uF appears to be wrong choice? Another capacitor value could be better? Thanks in advance Kind regards Luis 1 Quote Link to comment Share on other sites More sharing options...
BassBunny Posted November 22, 2023 Share Posted November 22, 2023 Hi Luis, that's a step in the right direction. I was completely confused by Peavey's description of the bass being "active but with a passive tone control". So it's actually just "active" pickups, the rest is just standard passive controls. Changing the capacitor will just make a difference in how much treble cut the control has. It's a bit confusing calling it a tone control as there is no "cut and boost", just treble cut, or it's becomes more bassy. A 0.1 uF capacitor will cut more treble than a 0.047. I think the pot might be the issue. Is it a log or linear pot? Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 23, 2023 Author Share Posted November 23, 2023 Hi there It is a linear pot 25k. Do you think another value should work as tone pot, like a CTS 250k pot? Kind regards Luis Quote Link to comment Share on other sites More sharing options...
BassBunny Posted November 23, 2023 Share Posted November 23, 2023 250K is the standard for normal pickups but not sure with active. A 0.1 uF capacitor should give you quite a range between off and full on. Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 23, 2023 Author Share Posted November 23, 2023 Hi there. As I read before: "active but with a passive tone control". Maybe is a good idea to check a pasive 250k pot as tone, with 0.1 uF capacitor, instead de 25K pot installed now? Thanks Quote Link to comment Share on other sites More sharing options...
kodiakblair Posted November 23, 2023 Share Posted November 23, 2023 2 hours ago, luisfpr said: As I read before: "active but with a passive tone control". Peavey did a few. Along with the RSB there was the B-Ninety, came as a standard passive PJ or active pickups with normal vol/tone pots; Foundation-S active followed the same pattern. Those 2 were fairly low key efforts. If I can unearth my RSB I'll check what pot/cap values were stock from the factory. Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 24, 2023 Author Share Posted November 24, 2023 'unearth'? Sounds really bad...... Sorry for your lost... Quote Link to comment Share on other sites More sharing options...
kodiakblair Posted November 24, 2023 Share Posted November 24, 2023 9 hours ago, luisfpr said: 'unearth'? Sounds really bad...... Sorry for your lost... Wasn't too bad. Bottom case in the middle of 3 piles, stacked 9 high. Of course those piles were hidden behind 20 basses in gigbags 🙁 Anyone who says you can never have too many basses has never shared a house with 70+ of the damn things 🤣 Sorry to report my efforts were in vain, the pots had no resistance markings on them and the solder monkey at Peavey chose to cover the Alpha product code for his ground points 🤬 All I could get was the factory cap was 0.1 and the pots came from the R 13 series. Looking through my records I see Peavey used 250k pots for both Vol and Tone on everything without a preamp, that 0.1 cap value was also used the the active B-90 and Foundation S models. Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 24, 2023 Author Share Posted November 24, 2023 Hi there Sounds useful for me. I'll try this weekend to replace the 25K pots with CTS's 250K pots, keeping in place the 0.1uF capacitor Thanks for your info Kind regards Quote Link to comment Share on other sites More sharing options...
luisfpr Posted November 25, 2023 Author Share Posted November 25, 2023 Hi there It seems.... Success! Changing the 25k pot for a 250k pot, and I've got an useful tone. It's not a wonderful range of tone, but, tone at all... The capacitor is welded to the midle connection of the pot Kind regards 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.