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I was browsing your youtube channel and found something familiar.
Your
ELTA 6870 is just like my
ACIKO ARC 116. It is also known by other names:
Clairtone, Geloso
Basel Compo TSR 4115 - without clock
Elite Electronic, Watson RR 5585 - without clock and tape counter
Audioton, Condor, General Sond GS-290 - with one cassette and TV, without clock
Here is a
video with a similar boombox.
Did you manage to repair it or not yet?