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Chinese Bass Preamp Installation
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Chinese Bass Preamp Installation
So, I have a chinese or DIY like 2 band bass preamp installed on a one pickup Ibanez bass. However, I’m stuck in the process of getting it connected. Basically the preamp has these connection cables:
Red – 9v
Black – Ground
White – preamp out
Blue – preamp in
Yellow – Treble (?)
Orange – Bass (?)The circuit has 1 pickup,1 vol, 1 concentric (bass/treble). I’m stuck connecting the concentric pot. Could you help me with that, please?
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2 Replies
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Hi Jorge
I’m probably not the best person to answer this as I’m usually a ‘passive-only’ kind of guy. 😄
From what I know, though, this is a little unusual. Generally, the EQ pots on a preamp have more than one wire to connect them. It’s typical for each to have three wires (I think one is essentially a ‘control wire’ and the others are ground and a reference voltage that the control wipes between to boost or cut frequencies). The fact that you’ve only one wire for each control complicates the active scenario.
If you’re sure that these are definitely treble and bass, I can only see two possibities, neither of which I’m certain of.
One is that we wire in a passive treble and bass control. Because it’s passive, it would only cut frequencies and not boost them. Also, it’s not guranteed to work properly with an active preamp. It may do weird things. If you wanted to try, you could use the G&L passive treble and bass setup that’s shown at https://tonefiend.com/guitar/two-band-ptb-tone-control-useful-easy-cheap-awesome/ The treble-cut is just like a regular guitar or bass tone control. The bass cut needs a lower value capacitor (it’s on that page) and will need a connection back to the volume pot.
The second option is a really long-shot. It might be worth experimenting by wiring the treble/bass wires to the wiper (middle lug) of the pot and then wiring one of the outside lugs to ground. It’s possible that this will work but I have some doubts.
Neither of these really feels right but might be worth a go if you’re getting desparate. Sorry. Option two has the advantage of being easier and faster to try and rule out so I’d start there.
tonefiend.com
Two-Band "PTB" Tone Control: Useful, Easy, Cheap & AWESOME! - tonefiend.com
The PTB Circuit was one of many G&L innovations. After the frantic soldering fest that was The Pagey Project, I figured it might be time for a nice, simple DIY wiring project. At the suggestion of tonefiend reader JH, I … Continue reading
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Thank you so much, Gerry!
Your help was very important. Long story short, it worked based on the G&L circuit with a little mod. I appreciate your help.
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