Not much I'm afraid 
We get a lot of questions re:- value of vintage products and in all honesty they are only worth what any one is prepared to pay. Condition is also very important and collectors look for this. The problem with older gear is amount of work needed to bring them back to tip top condition as many of the electronics will be worn or drifting out of spec's. For best money you need to sell them as seperate items on ebay with good descriptions & photos.
A rough guide would be :-
Beogram 1600, £75 with a good working cartridge. No cartridge and you'll be lucky to get £20 for it. The cartridge model will also greatly affect the price. If raising the maximum amount of cash is your priority then sell the cartridge seperately and you will probabaly get more for it alone than with the record deck - strange but true, probably down to the postage costs.
Beomaster 1900-2, again £75 ish would be a good price but I wouldn't be surprise to see it go quite a bit lower.
Beocord 1500, not many people play cassette tapes so you'll struggle to sell this at all - £10 if you're lucky.
The furniture will be hard to give away but knowing ebay anything could happen with that
Frankly you won't get anywhere nears its intrinsic value.
Chris.
The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.