Build SE class A using vintage 1970s Japanese green transistor 2SB707 and 2SB549(video2)

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The sound when go louder and volume decrease is cause by my phone not the amplifier, the actual amplifier is work very well with nice sound quality.

Schematic:
https://geeseang.files.wordpress.com/2021/11/2sb_amp.jpg
Category
Audio
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