Fender Blues Junior IV Settings Guide
The entry-point tube combo from Fender. 15W of American clean headroom with beautiful spring reverb.
The best Fender Blues Junior IV settings start with: Volume at 5/10, Bass at 5/10, Mid at 6/10, Treble at 6/10, Master at 5/10, Reverb at 3/10. Adjust from there based on your amp, guitar, and room volume. For Blues: Volume 6/10, Bass 5/10, Mid 7/10, Treble 5/10, Master 4/10, Reverb 3/10.
⚡ Start Here — Recommended Settings
| Control | Starting Position | Range |
|---|---|---|
| Volume | 5/10 | Silent → Loud |
| Bass | 5/10 | Thin → Warm |
| Mid | 6/10 | Scooped → Nasal |
| Treble | 6/10 | Dark → Bright |
| Master | 5/10 | Silent → Full |
| Reverb | 3/10 | Dry → Wet |
These are universal starting points. Adjust based on your amp, guitar, and room. Scroll down for genre-specific settings and artist-documented positions.
What Each Control Does
Recommended Starting Settings
Safe starting positions for any style. Adjust from here based on your amp and room.
All values on a 0–10 scale. These are starting points — fine-tune by ear.
Settings by Genre
Push the Volume so the amp breathes. FAT switch on for rhythm work.
Bright and clean. High treble, lower mids. Compression pedal in front.
Darker, warmer sound. Pull treble back. Minimal reverb.
Artist Settings
Documented settings used by professional guitarists on this unit.
Mayer runs Blues Juniors loud with volume pushed into natural breakup. Treble slightly cut.
Tips & Common Mistakes
- The tonal sweet spot is with Volume at 6-7 — the amp starts to breathe and the tubes compress naturally.
- Use the Master volume to control stage volume while keeping Volume (preamp) high.
- The FAT switch adds warmth but reduces headroom — keep it off for spanky clean Strat tones.
- The Blues Junior doesn't have a bright cap on the volume control — it's voiced brighter at lower volumes. This is by design.
FAQ
Fender Blues Junior IV — Common Questions
Best starting settings for Fender Blues Junior IV: Volume at 5/10, Bass at 5/10, Mid at 6/10, Treble at 6/10, Master at 5/10, Reverb at 3/10. Adjust from there based on your guitar, room, and playing style.
For Blues: Volume 6/10, Bass 5/10, Mid 7/10, Treble 5/10, Master 4/10, Reverb 3/10. Push the Volume so the amp breathes. FAT switch on for rhythm work.
For Country: Volume 4/10, Bass 4/10, Mid 5/10, Treble 7/10, Master 5/10, Reverb 4/10. Bright and clean. High treble, lower mids. Compression pedal in front.
Volume: Increases preamp gain and output. The amp starts to break up naturally around 6-7. (Silent to Loud). Bass: Low-end body. Cut at high volume to prevent boom in small rooms. (Thin to Warm). Mid: Midrange presence. Higher values = more cut-through. (Scooped to Nasal). Treble: Sparkle and edge. Fender clean sparkle lives between 6 and 8. (Dark to Bright). Master: Output volume without affecting preamp gain. Use Master high and Volume low for bedroom. (Silent to Full). Reverb: Spring reverb. 3-5 is musical; above 7 becomes washy. (Dry to Wet). FAT Switch: Engages a mid-boost circuit — adds warmth at the cost of clean headroom. (Off to On)
The tonal sweet spot is with Volume at 6-7 — the amp starts to breathe and the tubes compress naturally. Use the Master volume to control stage volume while keeping Volume (preamp) high. The FAT switch adds warmth but reduces headroom — keep it off for spanky clean Strat tones. The Blues Junior doesn't have a bright cap on the volume control — it's voiced brighter at lower volumes. This is by design.
John Mayer settings: Volume 7/10, Bass 5/10, Mid 6/10, Treble 6/10, Master 4/10, Reverb 3/10. Mayer runs Blues Juniors loud with volume pushed into natural breakup. Treble slightly cut.