Your looking for a "Philips 7768 UKG" FM install unit.

It's a very hard to find item.
Due to the fact that in the year of production BX610A the FM wasn't at all a common used
frequentie in the Netherlands.

So they are very rearly installed.
The 7768 could be installed in verious type of Philips radio's in that time period 1951-52-53.

BX700A (1950) was first Buildin FM but more a concept radio
BX524A (1952) was the second with standard FM build in.

Hello Maurice,thanks for your reply,therefore forget about that? Ok.
Well i'm also looking for output transformers for philips BX 645A,BX480A.And looking for a radio philips set BX435Z orBX435A. Thanks and best regards.Pierre