Here is a picture of the test setup and results. I disconnected the white wire that carries the mod board flip flop output (with the scaled tuner frequency) to the IC4 processor pin 38. I soldered a 1k ohm resistor to the white wire and connected my scope probes on either side. Next, I connected the low side of my ammeter to the end of the 1k resistor

Ready to continue. The volume display lamps from Dillen arrived earlier in the week. While on break from the Beomaster 6000 I've been busy at work and I did a restoration on another vintage piece (a non-B&O piece ...so please, no offense to anyone here). This weekend I plan to install the new lamps and button up the display portion of the Beomaster

Thanks Mika and Olly. That sounds like a good test. I am going to take a little break and just listen to some of these speakers through the Beomaster 6000...continuing the break in test of the new electrolytics and enjoying the sound at the same time. After all, enjoying the sound is a primary goal in all of this. Sonavor

It's difficult for me to compare speakers to each other Jacques. In accumulating a number of different brands and models of good speakers I find myself enjoying each one. From time to time I have set up several pairs and switched between them trying to do my own comparison but I always end up undecided and enjoying the music. Today was the first

Thanks for the link Mika. I agree, the flip-flop ICs shouldn't have any problem driving the processor...plus that is how they came from the factory and there were no problems. In my case though, that one signal is having problems. There is a problem with the tuner but that is my own created issue. I'm going to rest the project for a while and

I setup a breadboard test of the ON Semiconductor 74ACT74 flip-flop I thought might have died. It is still alive. I can setup similar conditions of the signals in and out of the flip-flop in the Beomaster on the breadboard and it works fine. I have no idea why none of these flip-flops can keep the IC4 processor (pin 38) happy. I am back to suspecting

Does anyone know what type of device the BM6000 IC4 processor is (TTL, CMOS)?

My order of flip-flops from Mouser arrived today. I'll get right to it - the result is mixed. I ordered more than one brand and type of flip-flop since they were low cost and I had to pay $6 shipping regardless of how many I ordered. The first one I tried was a Fairchild MM74HCT74N IC. It worked a little better than the original 74LS74AN in that

It looks beautiful. My Beocord 5000 refurbishment is still off a ways in the future but I am taking in all of this great information. Great job.

With the pull-down resistor removed and the Beomaster back to it's normal configuration (just a wire between the flip-flop mod chip pin 9 and the IC4 pin 38) - the IC4 pin 38 to ground measures 116.7K ohms. How does that compare to your BM6000? Do you have any specs on the processor IC regarding inputs, outputs and type of device? I hear what you