Service for Beomaster and Dual

Hi Guys, I "inherited" (found in the cupboard) my Dad's old Hifi system which in 1970 he must have brought all the way from good old Germany, a Dual TG28 Tonbandgeraet, a Dual 1015 as well as a Dual 1218 record player, a Beomaster 1400 and Beovox 2400 speakers. For sentimental reasons I would like to get the system going, but I am not sure how to go about it. All looks in a decent condition but I don't just want to connect and switch on without a prior serice or clean up. I am in Johannesburg, Greenside, who would you recommend to look at the stuff? How much would a normal service cost and is it even worth it? (I am new to this, I am not even sure whether service is the right word...)
Thanks in advance for any info, Chris