The Harry Joyce Custom 100 watt amplifier is an A-B class amplifier. These are all point to point, hand wired. Built right here in the United States of America under the watchful eye of George Scholz.
Material:
– 18 mm Marine grade Birch plywood
– Solid dove tail construction
All Harry Joyce Amps features include:
– Stainless steel chassis
– Enlarged filtering in power and bias supply
– Teflon & Ceramic tube sockets
– Improve shielding & layout
– Hum balance
It provides 4 inputs:
– Normal Hi/Low
– Brilliant Hi/Low
This Harry Joyce Custom 100 watt amplifier is a master volume design which includes:
Gain controls for Normal or Brilliant inputs, Tone controls for Bass, Treble, Mids and Presence. The pre-amp stage uses (4) 12AX7 Pre-amp tubes for inputs, tone, voltage amp, and driver. The output stage (output transformer) is designed for EL34HJ power tubes.
On the back side, voltage and ohm selector, 2 speaker outputs (in parallel) and Hum balance, send and return (effect loop), as well as, fuse holders for power, high voltage supply and IEC Filtered Power Entry Module.
Specs for Harry Joyce Custom 100 Watt amplifier:
Input resistance-High: 1meg ohm
Input resistance-Low: 136K ohm
Inputs can be linked from channel to channel
Tone controls:
Bass + minus -20db
Treble -6 to 30db with presence
Middle +10db
100 Watt Amplifier
Output Power RMS: 100 Watts
Input Volt Selector: 120Vac, 230Vac
Output Ohm Selector: 4, 8, 16 ohms
Effect Loop: -Send through master output, return input 1 meg ohm
Preamp Tube: 4x 12AX7
Power Tube: 4x EL34HJ
Fuse Power: 4A slow acting
Fuse High Voltage: 1A fast acting

















