
Headrush Amplifiers
68 Plexiglas 50W
Inspired by Marshall Super Lead Plexi 50W
The model 68 Plexiglas 50W is an amplifier inspired by classic vintage Plexi, designed to offer:
- Powerful, bright and dynamic sound at 50 watts
- Ideal for classic rock, blues and hard rock
- Perfect for single coil or humbucker guitars, also great with overdrive/boost pedals
Includes Treble, Middle, Bass, Presence, High Volume, Normal Volume and Output Level controls, for shaping tone, saturation and dynamics.
BluesRockHard RockBassClassic Rock
Controls
Treble
Control the high frequencies:
- Low → smooth sound
- High → bright and punchy
- Match the tone to the pickup and mix
Middle
Controls mid frequencies:
- Low → scooped sound
- High → fuller and more present
- Affects punch and definition
Bass
Control the low frequencies:
- Low → more defined and tight
- High → full and full-bodied
- Ideal for 35–55% for balanced sound
Presence
Control brilliance and final definition:
- Low → soft sound
- High → bright and punchy Modulate presence and attack in the mix
High Volume
Controls the level of the “High” channel:
- Low → light
- High → powerful and more saturated Interacts with EQ and Presence
Normal Volume
Controls the level of the “Normal” channel:
- Low → clean
- High → light crunch Useful for modulating dynamics and tone
Output Level
Controls the final volume of the amplifier:
- Negative → attenuation 0 d
- B → neutral level
- Positive → boost of the final signal Does not alter the timbre, only the overall level
Pro Tips
BEHAVIOR OF THE AMPLIFIER
- Powerful, bright and dynamic sound at 50W
- Precise response to guitar touch and volume
- EQ + Volumes → define body, brightness and saturation
- Output Level → balances the overall volume of the effect chain
Advice:
- High Vol + Treble → brilliance and crunch
- Middle + Bass → body and presence
- Normal Vol → clean channel
- Output Level → balances with other pedals/amps
Final advice:
- High Vol + Treble → define brilliance and crunch
- Middle + Bass → control body and presence
- Normal Vol → manages the clean channel
- Output Level → balance the sound with other pedals or amplifiers
Setup Examples
Clean vintage
Treble50%
Middle45%
Bass40%
Presence50%
High Vol40%
Normal Vol40%
Output Level0dB
Crunch / blues
Treble55%
Middle50%
Bass45%
Presence55%
High Vol55%
Normal Vol50%
Output Level+1 dB
Powerful lead / saturation
Treble60%
Middle50%
Bass45%
Presence60%
High Vol65%
Normal Vol55%
Output Level+2 dB

