I just bought a mid90s Ibanez SR1305-PW MIJ with an active pre and active pickups. Controls are:
- vol
- blend
- treble/bass boost/cut stacked mnob
- mid boost/cut and vari-mid freq stacked knob
The bass doesn't have an EQ bypass and I'm thinking of adding one. I asked an AI tool for instructions and I'd like a sanity check on them. Scroll down for the AI's steps. What do you think?
Do I need an SPDT switch for a passive blend or can I just leave the blend pot as is? Ideally, the treble boost/cut in the stacked treble/bass pot would be a passive tone control in EQ bypass mode.
AI instructions below.
**Step-by-Step Modification**
#### **Components Needed:**
- **Push/pull potentiometer** (500kΩ audio taper, 16mm shaft) to replace volume knob
- **SPDT on/on switch** for pickup blend (if converting to passive blend)
- **Capacitor** (0.047μF film capacitor for passive tone)
- Shielded wire, solder, heat shrink tubing
#### **Wiring Diagram Concept:**
```plaintext
Pickups →
[Push/Pull Vol Pot] →
│ (Bypassed: ↓ | Active: → Preamp)
↓
Passive Tone Circuit (Treble Pot) →
Output Jack
```
#### **Key Steps:**
1. **Replace Volume Pot with Push/Pull:**
- **Pulled (Bypass Mode):**
- Pickups → **Input Lug** of push/pull → **Output Lug** → *Directly to output jack*
- *Preamp disconnected from circuit*
- **Pushed (Active Mode):**
- Pickups → Preamp → Output jack (stock wiring)
2. **Convert Stacked Treble/Bass Pot to Passive Tone Control (When Bypassed):**
- **Treble Pot Rewiring:**
- Disconnect treble pot from preamp circuit.
- Solder **0.047μF capacitor** between the pot's input lug and output lug (creating RC low-pass filter).
- Ground the pot casing to back cavity.
- *Note: Bass pot becomes inactive in bypass mode.*
3. **Pickup Blend Modification:**
- Your blend pot *must* be converted to passive (500kΩ) or replaced with an **SPDT switch** (pickup selector) since active blend pots won't work in passive mode.
4. **Output Jack Rewiring:**
- Add a wire from push/pull output lug → tone pot → jack tip (bypass path).
- Retain original preamp → jack connection for active mode.
---
###
**Battery/Power Management**
- **Active pickups ALWAYS draw power** (even in bypass mode).
- Install a **battery cutoff switch**
- vol
- blend
- treble/bass boost/cut stacked mnob
- mid boost/cut and vari-mid freq stacked knob
The bass doesn't have an EQ bypass and I'm thinking of adding one. I asked an AI tool for instructions and I'd like a sanity check on them. Scroll down for the AI's steps. What do you think?
Do I need an SPDT switch for a passive blend or can I just leave the blend pot as is? Ideally, the treble boost/cut in the stacked treble/bass pot would be a passive tone control in EQ bypass mode.
AI instructions below.
**Step-by-Step Modification**
#### **Components Needed:**
- **Push/pull potentiometer** (500kΩ audio taper, 16mm shaft) to replace volume knob
- **SPDT on/on switch** for pickup blend (if converting to passive blend)
- **Capacitor** (0.047μF film capacitor for passive tone)
- Shielded wire, solder, heat shrink tubing
#### **Wiring Diagram Concept:**
```plaintext
Pickups →
[Push/Pull Vol Pot] →
│ (Bypassed: ↓ | Active: → Preamp)
↓
Passive Tone Circuit (Treble Pot) →
Output Jack
```
#### **Key Steps:**
1. **Replace Volume Pot with Push/Pull:**
- **Pulled (Bypass Mode):**
- Pickups → **Input Lug** of push/pull → **Output Lug** → *Directly to output jack*
- *Preamp disconnected from circuit*
- **Pushed (Active Mode):**
- Pickups → Preamp → Output jack (stock wiring)
2. **Convert Stacked Treble/Bass Pot to Passive Tone Control (When Bypassed):**
- **Treble Pot Rewiring:**
- Disconnect treble pot from preamp circuit.
- Solder **0.047μF capacitor** between the pot's input lug and output lug (creating RC low-pass filter).
- Ground the pot casing to back cavity.
- *Note: Bass pot becomes inactive in bypass mode.*
3. **Pickup Blend Modification:**
- Your blend pot *must* be converted to passive (500kΩ) or replaced with an **SPDT switch** (pickup selector) since active blend pots won't work in passive mode.
4. **Output Jack Rewiring:**
- Add a wire from push/pull output lug → tone pot → jack tip (bypass path).
- Retain original preamp → jack connection for active mode.
---
###
- **Active pickups ALWAYS draw power** (even in bypass mode).
- Install a **battery cutoff switch**