Harry Joyce Custom 50 watt amplifier

The Harry Joyce Custom 50 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

– All Teflon and Ceramic tube sockets

– Improve shielding & layout

– Hum balance

It provides 4 inputs:

– Normal Hi/Low

– Brilliant Hi/Low

This Harry Joyce Custom 50 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 an Hum balance, send and return (effect loop), as well as, fuse holders for power, high voltage supply and IEC Filtered Powered Entry Module.

Specs for Harry Joyce Custom 50 Watt amps:

Input resistance-High: 1 meg ohm

Input resistance-Low: 100 K ohm

Inputs can be linked from channel to channel

Tone controls:

Bass + minus -20db

Treble -6 to 30db with presence

Middle +10db

Output Power RMS: 50 Watts

Input Voltage Selector:  120Vac, 230Vac  50/60 HZ

Output Ohm Selector:  4, 8, 16 ohms

Effect Loop:  Send through master output, return input 1 meg ohm

Preamp Tube:  4x  12AX7)

Power Tube:    2x   EL34HJ

Fuse Power:    3A  slow acting

Fuse High Voltage:  500mA  fast acting