Replica Sugden A21 Mono 21w Pure Class A Single-Ended OTL Power Amplifier Board
Supply voltage: AC35v*1, mono 150w reserve
Output power: 21 watts
Quiescent current: 800mA-1000mA, adjust the potentiometer so that the voltage across the 1 ohm/5 watt resistor reaches 800mV---1V, first rotate clockwise to the head and then callback
Plate size: 224*71mm
The printing plate is 2mm thick and 70um thick copper, and the high current is forward and reverse.
All new components of the finished board, American alpha solder
Ruby 50v10000uF Electrolysis
The original factory uses the new three-ken triode C3284
Debugging method:
Adjust the potentiometer clockwise to the head before applying power. After the power-on audition is normal, turn it counterclockwise to adjust the voltage across the 1 ohm resistor to 800mV-1V.
Recommended protection board: (specially equipped with OTL lines, other protection is not possible) Contact me if you need it.
The product does not have a radiator and needs to be purchased separately by the buyer
Circuit diagram:
Refer: