An incredibly rare Italian made tube pre-amplifier, this Graaf Line GM13.5B mk II is possibly the best preamp that I have ever heard! Unfortunately, because of its rarity it is very difficult to find accurate information on it. There are links below to some of information and reviews we've been able to find.
Overall, the item is in excellent condition and works beautifully and comes in the original box.
Please ask any questions you may have and we will do our best to answer
