This is a preamp+amp amp, which can be connected to a power amplifier or active speaker, or it can be connected to headphones.
If you want to connect passive speakers and speakers, you need to be equipped with a power amplifier.
The sound of this machine is warm, mellow, sweet and transparent, and full of music. It is a cost-effective amp headphone, and it is also a preamp
The op amp can be replaced and the electronic tube can be upgraded, just plug and unplug it in the direction of the pin, and the playability is quite high!
If you push the earphone, you can push it to 300Ω, the general recommendation is 16-150Ω
About power supply
Adopting DC 12V input, DC3.5/5.5*2.1 socket, 100~240V AC input, wide voltage universally applicable!
About electron tubes and op amps
Use 6j1 tube for signal amplification (changeable models 6AK5, 6AU6, 5654, 6m1, etc.). Here we recommend GE's 5654 tube, which has a warmer, thicker sound and a better sense of presence.
The standard configuration of the amp adopts the classic dual op amp NE5532. The early king of op amps has been popular for several generations. I believe it will not be a problem for another 30 years. It is famous for its warm sound, low distortion, high fidelity, and high cost performance. Some high-end machines are also in use!
Plug-in op amp seat design, easy to upgrade and replace the op amp, alternative models are: 4558 LM833 LT1057 AD827 OPA2604 OPA2134, etc., different collocations, different sounds, free choice according to personal preferences.
OPA2604 is the more economical and affordable one with strong taste. Friends and friends can contact the seller.
About 6J1 tube
6J1 is an indirectly heated sharp cut-off pentode. In the past instrument-level equipment such as tube millivoltmeters, her small figure can often be seen, which is enough to prove the stability of the tube. High, but the performance is not weak. Many veterans have played this tube and recognized it.
Electronic tube sound characteristics
Some electrons are used for magnification and some are used for polishing. The tube amplifier has his unique "guts" sound, warm and enduring, good music feeling and good atmosphere. The tube amplifier is an ancient and enduring evergreen tree in the audio industry. Its sweetness, softness, and natural roundness are unmatched by others.
