Summit Audio TD-100 Instrument Preamplifier and D.I. - Manual (Page 13)

Model TD-100 Tube Direct Box 13
Specifications
Power
Internal AC Supply
20 watts
115 volts
50 or 60 Hz
Fuse size is .5 amp, slo-blo for 100/115 V
Fuse size is .25 amp, slo-blo at 230 V
Dimensions
W: 8.5”, H: 1.75”, D: 8.5” (Two units fit side by side on a
standard one-space rack shelf.)
Weight
7 pounds (3.15 kg)