Try measuring voltage from ground (transistor TR3 emitter or similar) to each of the leads of the lamp holder. Martin

Yes, that one will need all components from the drivers (BF857) and outwards replaced as a minimum. It can be very tricky to get it all right if you are not very experienced and the power supply won't hold back if something gets in the way electronically so look out for flying parts of transistor housings etc. If you are not very experienced with

Welcome to Beoworld ! Grab a capacitor kit and replace the lot. Replace also the trimmers for the DC offset and idle currents and readjust to factory specs. Check for cracked solder joints at all connectors on the processor, display boards and check the general condition of the low voltages power supply board. Not the easiest system to work on but definitely

Both voltages are important; The 14,3V since it supplies the FM frontend. The 26V since it supplies the AFC "balance" circuit. The TR7 emitter I would have expected a little higher and I think that's where the main problem is. If you still have the original TR7 and zener(s), I suggest you try to remount them and check again. Martin

Well, I think I would check for drift on the supplied DC voltage first. Then lose ferrite cores and/or cracked solder joints. The round metal housing used on some of the high adjustable caps can also be troublesome with intermittent continuity. Many strange tuning faults can be corrected by simply resoldering the whole board. Ceramic caps can fail,

It's correct that capacitor kits are readily available for most Beomasters etc. Beomaster 900 came in several different versions and kits are available for some but probably far from all. However, if one does not exist, one can be constructed. Still, apart from a few candidates, like f.e. the large power supply filter cap and the cap #514 on the

B&O means quality ! B&O Homogén resistors are, as their name suggests, uniform in their whole cross-section. Mechanical overload and overburn is therefore out of the question. Furthermore, the resistors are noisefree and constant and because of these properties should you only use the danish quality mark B&O. Price for all values

Well, basically I suppose you can start from the beginning of this thread again but it sounds like it could use a good overall service or maybe a complete restoration overhaul. Martin

Try disabling the AFC and see if that helps tuning a bit. If the radios IF circuits are not 100% trimmed, AFC can easily confuse things. I'm not sure about the local regulations in your area with regards to grounding. In Denmark, most radios are just running on live and neutral with no grounding and I would suggest, if needed, to seek a good grounding

A signal generator and a power (watt-)meter would be nice. I use B&O TG7 and RWM4 but others will work just as well. A multimeter on AC volts put across the speaker output and a steady and continous test signal of f.e. 1KHz sinewave on an input will surely be adequate to at least give you an idea. Martin