Welcome, Robert 🙂

Good choice on the speakers. RL6000's are very good all-round performers. You can run them off pretty much anything - I actually had mine connected to a Beomaster 900M for a while and it sounded surprisingly good! Not too loud, obviously... these speakers are designed for much more power. BM3000/4000/4400 would be a good choice, as the older "ironing board" BM2000. These all have DC-coupled amplifiers, more suited to louder listening on modern speakers.

The old non-computerized receivers are generally very reliable. They may have aging capacitors and such, but once these are sorted out they may well go another 20 years without much service. They can usually always be repaired as well; the microprocessor controlled receivers may contain some unobtainable parts.

I don't know how much you intend to listen to radio, but one thing to note is that for some peculiar reason the FM scale ends at 104 MHz on most '70s Beomasters (BM4400 as one exception).

Interestingly the Redline series of speakers were originally designed to match Japanese music systems and to give B&O a new market. The breakpoint crisis saw them being touted as the replacement to the traditional speaker range which were more expensive to make.

The only problem with older equipment is that it will normally be showing signs of age. It is not only components like capacitors but also the actual controls which will wear and transformers start to hum. One way around this is to get a fully restored item and the person to see about this is Frede Kristenssen at

Dear Mika,

Thank you kindly for your thoughts and ideas.  We received a load of Finland Pine two weeks ago for ceilings, some of the floors and walls in the house that I am making!

Perhaps I have read somewhere that playing high watt speakers loudly with a low watt amplifier will actually harm the speakers themselves.  Is this what you are refering to?

In thinking the choice of an amplifier/receiver through, styling, reliability and a proper sized unit for the RL6000 speakers would seem to be the most important issues for me.  I will study up on the BM 3000/4000/4400 units.

Radio is another issue...NHK radio in Japan broadcasts on 84.5 MHz.

Thank you again for your thoughts.

Respectfully,

Robert

Dear Peter,

Thank you for your insights and for assisting me in my search for a suitable receiver. 

Using an older Bang & Olufsen receiver in Japan presents some special challenges including those that you refered to.  99.9% reliability coupled with vintage style, 100 volts AC here and the FM frequency might suggest that my only option would be Mr. Kristenssen at Classic Audio .

I will contact him to discuss the possibilities.  Thank you again for your guidance.

Respectfully,

Robert

I am sure you will not be disappointed. Frede is a wonderful chap and a true enthusiast. If anyone can help, I am sure he can.

Best wishes,