PTT Bujumbura :

 

a recording from 1971
and a different version from 1973 (both: rb)

 

this verification letter dates from 1970, station received while visiting a DX-colleague...

 

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Callsigns:
9UB **

 

Frequencies Voice:
8000
8110
10111
10121
10211
14425
14440
14558.2
14769.7
15927.1
16080
16396
16406
17420
17440
23020

 

Frequencies Radioteletype:
10570

 

Systems used:
50 Bd