Hi ! I had a Experiement on MG_Head of modify it to become a Choke Load OTL Headphone amplifiers. It become more bass , more open , better sound stage. It is very easy : Just remove the nfb loop (R5,C3 , R6,C4) and connect a 100/160V Capacitor to Plate of VB2 and VB3 (6BQ5) . It can drive...

Hi ! I'm a designer of tube amplifiers. I had a new idea of a Headphone Adapter. It is a passive device. Use step down transformers to coupling to Headphone. Usage : turn all amps to have a Headphone Output with Low output impedance. I had try it on Line amps with 12AU7 un SRPP , 6DJ8 in...