Hiwatt DR103 Head

The DR103 is the amp the Hiwatt name rests on: Dave Reeves' late-1960s 100-watt circuit, hand-wired, four ECC83s in front of four EL34s, and enough clean headroom that a pedal arrives at the speaker sounding like itself.

Normal and Bright channels each get their own high- and low-impedance input, so a dark humbucker and a shrill single-coil each have a jack that suits them. Jump the two channels with a short patch lead and the independent volumes become a tone control of their own, which is the sound Hiwatt is known for. The rear-panel selector sets 4, 8 or 16 ohms.

Wattage	100W
Channels	Normal, Bright
Inputs	Normal Hi; Normal Low; Bright Hi; Bright Low
Output	2 x 1/4" Speaker Out
Preamp Valves	4 x ECC83 (12AX7)
Output Valves	4 x EL34
Controls	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
Impedance	Switchable using Impedance Selector on the rear panel - 4 Ω, 8 Ω, or 16 Ω