The amplifier and all electronics of BL3000/4500 are quite the same. The 4500 is just bigger... and more loudspeakers. Sometimes bigger is better... it depends just on the size of your house. But...: there are only a few survivors of the 3000/4500. They are prone to fail with bad solder connections, broken wires, defect boards and bad caps. Also the displays are hard to find in working condition, they are identical to early Pentas. Without a specialist checking these old hardware it's very frustrating... 90% are simply dead ore unusable. But if its done and they are working: NICE! :)

Without a specialist checking these old hardware it’s very frustrating… 90% are simply dead ore unusable. But if its done and they are working: NICE! Login to view image

Thank you for your comments - I remain ever hopeful of finding a good pair of these BL3000 wall-hangers. They're so cool! Julian

I have both BL6000 and BL3000 and Penta 2s. Whilst I have't listened to my BL3000s for a long time now I can tell you in my opinion they sound MUCH warmer and fuller in sound. If you're lucky good sets are still around but the display units can go weird, I need to service mine at some point. Best or luck :-)

Hi @David656, I appreciate your comments. I think I'm going to double my efforts to find a pair of BL 3000s. I am a little nervous about what to expect regardig the displays - but there's a very clever chap I know in Kent who's a dab hand at 80s/90s B&O repairs so if I find the right set I'm certain he can breath a little magic over them. Julian