Reply To: How to connect a Beolab 3500 to BM7000 March 11, 2023 at 5:15 pm #17332 GuyModerator Warwickshire, UKTopics Started 12Total Posts 740 filip_kbh wrote: Which one to choose? Service manual states BC547B And for the diode it states: 1N4148 This reply was modified 3 weeks ago by Guy.