This touch panel problem was a clear manufacturing fault, and often has been (should be) repaired at no charge even after the warranty is out. I don't know if it would be a problem when you are not the original owner, but it's worth asking the local B&O anyway (if you are not willing to return the whole thing).

The purpose of the detector is to output a voltage that is proportional to the FM modulation, i.e how far the carrier is from the nominal frequency. It can go a certain value up and a certain value down, but outside these limits the signal starts to distort as the detector goes out of its linear operating range (the curve looks a bit like an S). This

I'd say keep the pot and just adjust it properly. I don't believe there's much of a chance of getting a symmetric detection curve with fixed components, no matter how carefully selected. There'll be enough of loose tolerance around, not least the germanium diodes and the coils which you can't help much. I believe the "noise"

[quote user="richtoy"] I use a generic 5 pin DIN to female phono and coonect this to a 3.5mm to twin phono lead. Just switch the BeoCenter to AUX turn on the iPod and try the pug combinations until you get a sound. [/quote] And never trust the colours, even though you may be used to white & red being the left & right! I used to have

Lots of equipment from this era has contact problems or bad solderings to begin with, which may create all kinds of issues when the friendly shipment guys throw them around and play football with them shake the packages a little bit. It's impossible to say what the actual problem is without investigating further, but it does need service now, and

Regarding the tape hum, try disconnecting everything from the Beocenter and try playing it through passive speakers (or headphones). If the hum is still there, it is a fault in the Beocenter, and you have at least one thing less to hunt for in your other setup...

No problem John, sharing whatever I've learned is half the fun Unfortunately I really can't remember the mechanical details of that light panel too well. Unless anybody else has some input on that, I'll open my spare receiver and take a look later (it's just standing in a closet pending more work anyway).

[quote user="macjonny1"] I can't help to think that people getting a subwoofer made by B&O now are making serious compromises for design. The specs on this (33-300Hz???, 6.5" drivers, 200W) are strange, and performance is probably blown away by subs 1/4 of the cost. [/quote] Maybe, but can you stand watching them day after day

How many times I have wished the original PCBs were fibre epoxy instead of pertinax! That's one determinate repair undertaking

[quote user="John"] Thanks for your warning about the sliders they did not seem to be noisy so I will not risk anything. I suspect aligning the potentiometers with the panel sliders might be enough of a problem. [/quote] I was referring to cleaning the panel sliders, not the pots themselves. Aligning is easier than it seems - just drive all