Feature

●1. The circuit board adopts JLH1969 classic circuit design, and the PCB board adopts double-sided gold plating process, which is sturdy and durable.
●3. Aviation grade magnesium alloy angle aluminu
●4. Capacitors use high quality German , Japanese FC, ruby and other materials
●2. Precision pairing of transistors
●5. Resistance: copper foot metal film, 5-ring precision

Description

Geynutaly The finished board is an assembled, adjusted and tested amplifier boards of the classic JLH (John- 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, pipe 2N3055 or ON3055.ON15024
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 120 watts, 8 inches or less, and true sensitivity above 86.
The midpoint of their own adjustments / quiescent current :
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 1/2 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 12-26V.18-19V transformer works well
Output power:Class A 10 watts, quite ordinary 35 watts.
Colour:As Shown
Material:plastic
Size:Finished board size:100mmx73mmx30mm

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.