Hello Carlesdg
I have listened to about 30 pairs of Hurricane amplifiers and spent a lot of time with every version manufactured.
To try to answer your original question, the latest MKII is not that different sonically than the later MKI versions (horizontal aluminum chassis). The circuitry is still the same and they both use the green Illusion oil capacitors.
The MKII now has balanced inputs standard which is why you see a different input tube arrangement. Transformers are slightly improved as is the bias circuit.
Obviously they have gone to a new chassis which weighs in at about 80+ lbs. each.
I have listened to about 30 pairs of Hurricane amplifiers and spent a lot of time with every version manufactured.
To try to answer your original question, the latest MKII is not that different sonically than the later MKI versions (horizontal aluminum chassis). The circuitry is still the same and they both use the green Illusion oil capacitors.
The MKII now has balanced inputs standard which is why you see a different input tube arrangement. Transformers are slightly improved as is the bias circuit.
Obviously they have gone to a new chassis which weighs in at about 80+ lbs. each.