They both have great cleans channels with a griity boost capability. The red head is 90 watts and has a smoother to end and of course is louder. The black one is 45 watts. Slightly more open. The main difference is in the pre-boost section.
Both heads have a great clean tone. The difference is in the wattage. Red head is 90 watts and the black head is 45 watts. The boost is smoother on the red head. It is like Eddie's tone on the first album.
Prashant Aswani: Sonically Speaking, brilliant new CD buy