sony: Sony ICF-110B/W: When IC''s were a new thing to common people

Sony marketing did his job by proudly advertizing the use of Integrated Circuits in these two radio model variants (110B and 110W), along with other Sony series of the era, like the ICF-5500, ICF-110, ICF-500, among others.

The IC in question was a audio pre-amplifier/driver device containing three NPN Si transistors in DC coupled configuration, encapsulated in a DIP with 6 pins and designated as Sony CX-025.

The CX-025 6-pin DIP pinout is assigned inconsistently on different Sony models, depending on the IC version. There are public references at least to the CX-025, CX-025C, CX-025D, and CX-025E. Some versions pinout designate pin numbers above 6, despite the IC having only 6 pins.

Example of a CX-025C IC as seen on the ICF-110B and ICF-500S models:

 

Example of a CX-025D IC as seen on the ICF-110W models:

 

On the ICF-500S the CX-025C pinout looks normal with pin numbers assigned from 1 to 6:

 

However, on the ICF-110W the CX-025D IC pinout numbering looks irregular with pin numbers above 6:

 

Additionally, the CX-025E used in the ICF-5500M not only uses pin numbers above 6, but also assigns different pinout as seen on the CX-025D, not to mention the now wrong symbol for an opamp:

 

 

Comparing the three IC versions as used in the circuit diagrams, it looks that all share the same internal design, probably only differing in the gain and driver current.

 

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