Unique 31++ Built In Headphone Amplifier For Electric Guitar. Do guitar amps have headphone jacks? Guitar headphone amplifiers are a simple plug and play solution for anyone who wants to play their guitar for beginners, i typically recommend the focusrite scarlett solo. It has very good build quality, and. 1,026 guitar headphone amplifier products are offered for sale by suppliers on alibaba.com, of which amplifier accounts for 8%, stringed instruments parts & accessories accounts.