|Object Name:||D.C. Amplifier|
|Year of Manufacture:||circa 1964|
|Location:||Main Object Store|
The basic properties of "crystal triodes" or transistors had been demonstrated at the Bell Telephone Laboratories in America in 1947 but it was to be many years before they came small enough and reliable enough to be used in practical hardware. Elliott used a mixture of transistors and thermionic valves in the Elliott 802 computer of 1958 before their computers became fully transistorised.
The function of this circuit block is not currently known (the title dc amplifier suggests a type of Operational Amplifier). From the Serial No. the date of manufacture is 1964 and it certainly has the appearance of a more modern product than the Transistor Amplifier ODCM0474.
It is believed that these Amplifiers were delivered for the TSR-2 Flight Control System (This information is from Graham Holloway).