abbie:
How do I tell which equipment has a pre-amp built in? I've looked on the specs for the 3000 but can't pick out what it is that shows you it has a built in pre-amp and then if I end up choosing both a turntable and amplifier that both don't have a built in one what do I do?
Hi Abbie, I think it is safe to say that all Beomasters from the 70's thru to mid-80's have the RIAA pre-amp (BM6000 quad maybe doesn't, but I don't think you'll be aiming for one of those anyway). The 3000 definitely does. Likewise, none of the radial decks has it (except for 3400 quad and some oddities), so almost any pair from that era will work.
Anyway, the issue will not be a showstopper - if both of the units have the preamp, you can connect the deck to the tape input on the Beomaster. If neither of them has it, you can add one externally for the cost of a few tenners. Try to avoid that anyway since the external boxes will always be a hassle.
We have some information on the devices over here and the Jarmans' book (excellent reading in any case) has a list of suggested nice combinations.