Summary of the Comparison
The Friedman JJ Jr is ideal for players seeking a classic, organic British-voiced tube amp with rich harmonics and responsiveness, great for rock and blues. The Revv G20, with its modern high-gain tones, built-in Two Notes cab simulation, and direct recording options, is perfect for metal and studio-focused musicians.
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The Revv G20
The Friedman JJ Jr
Main Differences
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- Friedman JJ Jr: Classic British-voiced high-gain, warm and organic tones.
- Revv G20: Modern high-gain, more compressed and aggressive sound.
- Channels: JJ Jr has 2 channels; G20 has 2 channels (clean and high-gain mode).
- Power: JJ Jr – 20W/5W; G20 – 20W/4W.
- Built-in Attenuation: Both have power scaling for lower volume use.
- Built-in IRs: G20 has Two Notes Torpedo IRs; JJ Jr does not.
- FX Loop: Both have an effects loop.
- Footswitchable Gain: Both allow gain switching via footswitch.
- Use Case: JJ Jr – more vintage/hot-rodded Plexi sound; G20 – more modern metal-friendly.
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Specs Comparison
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| Feature | Friedman JJ Jr | Revv G20 |
|---|---|---|
| Power | 20W (switchable to 1W) | 20W (switchable to 4W) |
| Channels | 2 (Clean & Gain) | 1 (High-Gain with Clean via Guitar Volume) |
| Tube Configuration | 2 x EL84, 3 x 12AX7 | 2 x 6V6, 3 x 12AX7 |
| Built-in Attenuation | Yes (20W/1W) | Yes (20W/4W) |
| Direct Recording (Reactive Load & IRs) | No | Yes |
| FX Loop | Yes | Yes |
| Speaker Output | Yes (8 & 16 Ohm) | Yes (4, 8 & 16 Ohm) |
| Weight | 16.5 lbs (7.5 kg) | 9.9 lbs (4.5 kg) |
| Best For | Hard Rock, Classic Rock, Blues | Metal, Hard Rock, Modern High-Gain |
| Target Skill Level | Intermediate to Advanced | Intermediate to Advanced |
| Approximate Price | $1,299 | $1,299 |
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Best Situations for the Friedman JJ Jr
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- Perfect for high-gain tones with tight low end and rich harmonics
- Ideal for classic rock, hard rock, and metal styles
- Great for home practice with built-in power scaling (20W to 0.5W)
- Excellent for recording with direct out and cab simulation
- Responsive and dynamic for expressive lead playing
- Compact and portable for rehearsals and small gigs
- Works well with pedals for added tonal versatility
- Clear and articulate tones, even at lower volumes
- Authentic British-voiced sound with modern refinements
- Reliable build quality for consistent performance
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Best Situations for the Revv G20
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- Perfect for high-gain metal and rock tones
- Ideal for home practice with built-in Two Notes reactive load & cab sim
- Great for direct recording with USB and XLR DI out
- Seamless integration into live setups with speaker or silent operation
- Versatile clean and crunch tones for blues and classic rock
- Compact and lightweight for easy transport
- Reactive load lets you play without a speaker cab
- Switchable 20W/4W power modes for volume control
- Built-in noise gate and boost for tight, aggressive sound
- FX loop for integrating pedals and effects
- MIDI controllable for flexible rig integration
- Reliable tube-driven tone in a small package
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Find the Boss Katana that Works for you
Which Boss Katana amp should I buy? (Quiz)
This quiz has seven questions that will help you decide between the six main versions in the Boss Katana amp series. The only one we've left out is the Katana Air. If you have questions feel free to drop them in the comments section below. Click the green start button to begin:
Popular Guitar Amp Roundups and Comparisons
Written by Bobby Kittleberger on Amps & Roundups
Written by Bobby Kittleberger on Amps & Roundups
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