Preamplificatore valvolare Bluetooth 5.0 amplificatore cuffie tubo USB + tubi elettronici 6K4
Pluggable enthusiast tubes. 6K4 electronic tubes have a strong tube taste and is more resistant to hearing. With the pluggable design, they can be replaced and upgraded to 6 1N, GE5654, 6AK5, EF95, etc.