915 Generation DIY Hifi JLH 1969 Amplifier Audio Class A Power Amplifier Board Stereo High Quality for 3-8 Inch Full Range Speakers

2 Precision pairing of transistors
3 Aviation grade magnesium alloy angle aluminu
4 Capacitors use high quality German ERO Japanese FC ruby and other imported materials
5 Resistance copper foot metal film 5-ring precision

The finished board is an assembled adjusted and tested amplifier boards of the classic JLH John-LinseY Hood 1969 class A amplifier While JLH 1969 is a simple design it is still one of the best transistor amplifier
Gold seal pipe small pipe 2N2907 middle pipe 2N1711 large pipe 2N3055 or imported ON3055ON15024
Application Suitable for listening to vocals you can choose 3-5 inch full-range speakers you can choose 5-8 inch full-range speakers for listening to bass or you can choose 2 way speaker with power below 120 watts 8 inches or less and true sensitivity above 86
The midpoint of their own adjustments quiescent current method
Tune midpoint universal table hit voltage profile black pen then the red pen then GND TP1 test holes TP1 at the output capacitor positive board the adjustable resistance KT1 it is 12 of the supply voltage
Modulated current 10A universal table hit stalls a pen then positive power supply the other one pen then VCC terminal adjust the adjustable resistance KT2 change the current board size
Input voltage Recommended 100-150W transformer voltage output 12-26V18-19V transformer works well
Output powerClass A 10 watts quite ordinary 35 watts
ColourAs Shown
Materialplastic
SizeFinished board size100mmx73mmx30mm

Package Contents
1 * Amplifier Audio Board DIY Kit

Only the above package content other products are not included
Note Light reflection and different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is - 1-3cm