The new Harry Joyce Custom 50 watt amplifier is an A-B class amplifier with attenuator feature. These are all point to point, hand wired. Built right here in the United States of America under the watchful eye of George Scholz.
– 18 mm Marine grade Birch plywood
– Solid dove tail construction
All Harry Joyce Custom 50 watt Amplifier features include:
– Stainless steel chassis
– Enlarged filtering in power and bias supply
– All Teflon tube sockets
– Improve shielding & layout
– 2 watt resistor value
– 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 of our custom ECC83HJ (12AX7) Pre-amp tubes for inputs, tone, voltage amp, and driver. The output stage (output transformer) is designed for our EL34HJ power tubes.
Grand Master volume
Our new Grand master feature allows you to attenuate post master volume, resulting in higher gain and lower volumes as you attenuate, helping you achieve the perfect amount of gain at the appropriate level on stage or in the studio.
Dual status indicators
The Blue LED indicates line voltage present.
The Green LED Indicates high voltage present.
This is a helpful tool since a loss of high voltage is a blown fuse most likely cased by a faulty tube.
On the back side, voltage selector is now inside for safety and industrial grade ohm selector, 2 speaker outputs (in parallel) and an unbalanced slave output (signal is tapped directly off the output transformer). Hum balance, send and return (effect loop), as well as, our military grade fuse holders for power, high voltage supply and I.E.C. Filtered Powered Entry Module.
Specs for Harry Joyce Custom 50 Watt amplifier:
Input resistance-High: 1 meg ohm
Input resistance-Low: 136 K ohm
Inputs can be linked from channel to channel
Input sensitivity 2.5 M.v.@ 500 Hz
Bass + minus -20 db
Treble -6 to 30 db with presence
Middle +10 db
Output Power RMS: 50 Watts
Input Voltage Selector: 120 V, 230 V
Output Ohm Selector: 4, 8, 16 ohms
Effect Loop: Send through master output, return input 1 meg ohm
Slave Output: Level dependent
Pre-amp Tube: 4x ECC83HJ (12AX7)
Power Tube: 2x EL34HJ
Bias Supply: 1x 1N3254
Fuse Power: 2.5 A @ 250 V slow acting
Fuse High Voltage: 500 mA slow acting