When the base is grounded, it oscillates between 1,7V and no connectivity. Excuse my ignorance, I was born long after the days of germanium semiconductors. 😁

There are 25V after the diode, I haven't measured further down the line yet.

Just bypassed the preamp, and yes, it works fine. Just a bit too quiet, if you know what I mean. 👍

Strange. I checked the connectors, the caps, the transistors, the diodes, visually checked for bad solder joints...and yet this thing is dead as a doornail.

I'll have another look at it tomorrow, I've used up my patience for today. 😕

😡

You know how sometimes you spend an eternity looking for a problem, and then suddenly you stop and think: "Wait, have I checked...? I mean it's obvious, I'm sure I have...right?". Well, then you know how I feel right now. 😮

I was measuring the supply voltage to the amps. You know, the voltage behind the power supply section. The voltmeter showed -50V. That can't be right. I mean, the minus. So I stopped and considered "in relation to what?". Well, I had it connected to the black cable of the AC supply. Which, according to the diagram, should be connected to common ground. However, there was no voltage at all in relation to the chassis. So I checked the preamp board. No connectivity between the AC input and ground. And that's when it dawned on me. The connection was not on the board, but between the connectors. Remember - those connectors that somebody had messed up to bypass the preamp? 😛 Sure enough, there was no connection. That's when I started to feel like an idiot. 😳 So I soldered a piece of wire on there, connected the turntable to the amp, set down the needle...music. Not sure if I should feel happy or ashamed. 😎

No need to be ashamed, you fond the failure and thats it, I've done a lot of works where I looked for failures for days, and not finding them, stopped took a long brake, and went back to the basics. 😂

Good job !

Repairs to faults that has no "natural" cause are often the worst and most time consuming.
Particularly if you are not aware that somebody has modified something so you are merely
checking what would normally go wrong.

Martin

Just curious: What exactly is the difference between these two? The 75µ came with the Beogram, so I suppose this is the orignal. Unfortunately the stylus didn't survive shipping, so now I'm using the 15µ.

All original pickup cartridges bear the B&O logo. And that goes for the inner (coil) part as
well as the outer (needle) part.
No B&O logo = not original.
There were countless manufacturers of more or less suitable cartridges and needles,
some could be combined with B&O parts, others not.
Some were surprisingly good, others eh.. not quite so good.

Martin