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This product is proudly handwired in the Hiwatt Custom Shops HANDWIRED

DR504 Head

Custom Hiwatt 50W Head

Legendary Hi-Headroom, crystal-clean tonal character, instantaneous response, sonic depth and detail have made this original Dave Reeve's circuit a recording and performance giant for more than 60 years. With half the power tubes of it's big brother (the DR103), the DR504 offers the iconic Hiwatt tone while allowing to play on the edge of breakup at recording volume.

The classic British sound trusted by musicians and engineers for generations.


  • — Faithfully hand-wired according to Dave Reeve's original late 60's circuit design.
  • — Hiwatt is the premiere Pedal platform prized for clarity and Headroom. Presents Pedals true to your sound — no effects loop requiRed.
  • — Normal and Bright channels with independent High and Low impedance inputs for each channel. Versatile and intuitive, perfect for bringing life out of dark pickups or taming shrill high end in bright pickups.
  • — Link the two channels for extra punch and dynamic control of your EQ via the independent channel volumes. Unleash the ’jumped’ channel sound Hiwatt is famous for.
  • — All the clean Headroom you could want.
  • — AP / Truly All Purpose Amplifier. Historically used by the world's most influential artists on a wide range of instruments in the studio and on stage. Ideal for amplifying bass, keys, synthesizers, guitars and other full-range and acoustic instruments.


channelsNormal, Bright
  • Normal Hi
  • Normal Low
  • Bright Hi
  • Bright Low
2 x 1/4" Speaker Out
preamp valves4 x ECC83 (12AX7)
output valves2 x EL34
  • Normal Volume
  • Bright Volume
  • 3-Band EQ shared by both channels — Bass, Treble, Middle
  • Presence — Treble Boost shared by both channels
  • Master Volume
  • Standby — On/Off
  • Mains — On/Off
impedanceSwitchable using Impedance Selector on the rear panel — 4 Ω, 8 Ω, or 16 Ω
height255mm (~11")
width630mm (~25")
depth280mm (~12")
weight19.15 Kg (~43 lbs)
  • Road Ready — Rugged 18mm Birch-Ply Construction
  • Band Ready — ’Soak Tested’ by our Custom Shop Technicians
  • Touring Ready — World Voltage and Impedance Selectors
  • Based on Hiwatt’s original circuit designed by Dave Reeves.
  • Original Partridge spec English transformers.
  • Meticulously hand-wired to Harry Joyce’s exacting military standards.
  • 🇬🇧 Proudly manufactured in the Hiwatt Custom Shops.