I am selling a Bogen Challenger HF10 converted to a Brown 6G2 Princeton. The amp sounds great and can be put into a head cabinet or a made into a Combo. This has a lot of head room before breaking up. This will make a great stage or recording amp for guitar or even harmonica. I have a copy of Schematic and notes from my amp tech. In the photos. Tap on image to enlarge. Please understand ***Buyer must contact us within 24 hours and pay for shipping, handling, and insurance . I ship world wide, please understand shipping cost is for USA. There will be additional costs for international shipping. Please ask all questions if you have any concerns prior to bidding. PLEASE UNDERSTAND IF IT'S NOT IN THE DESCRIPTION, IT'S NOT INCLUDED. Thanks and check out my other listings.