On recto amps I ever recomend two brand of tubes, =C= and JJ.
=C= are the louder and cleaner well balanced on all frecuencies. On the other hand JJ have its special attitude, they aren´t as loud as =C= also aren´t as well balanced as =C= but they have a mighty mid frecuencies booster up that makes the sound absolutely " BRONCO ", JJ are rough, rude and not politely and reminds me the classical feels of the marshall totally overdriven that tubes are for guys with big balls and guts