This page is about quite an obscure English early transistor manufacturer: Associated Transistors. The excellent Grace's Guide contains the bare bones about this company:
- 1958 Founded jointly by Ericsson Telephones, Automatic Telephone and Electric Co. and English Electric Co.
- 1960 Pilot plant in operation at Ruislip. Bullish claims about building the most advanced semiconductor factory in the world at Basingstoke, to make 15 million transistors a year by 1963.
- 1961 Apparently manufacturing and selling semiconductors.
- 1962 Acquired by Mullard, subsequently vanished as a brand.
I have very few AT devices and I have no original AT data books or sheets. If you can provide me with any please
This type AT/RF3 is the only loose AT type that I possess. The logo is cleverly constructed from two transistor symbols arranged to make the capital letters AT. I suspect it is a germanium PNP radio-frequency type. If you can provide any information about this transistor, please
The 1969 DATA Book of Discontinued Transistors has entries for Associated Transistors. Whilst it's a long process to search through the thousands of devices in it, I was able to find the following:
- AT/AF1
- AT/AF2
- AT/RF1
- AT/RF2
- AT/S13
The only information given is that they are alloy transistors. Presumably 'AF' stands for 'audio frequency', 'RF' stands for 'radio frequency' and 'S' stands for 'switching'. The type AF/RF3 is not included. I would be very interested to obtain such types, and also original or copied data on AT's devices. If you can provide any, please
I also have examples of two 2N series types made by AT: 2N269 (shown) and 2N564, mounted on circuit cards which come from a KDF9 computer. These are both germanium PNP types and I suspect that they are RCA-originated as AT had a licensing agreement with RCA. They do not have the same complex logo as the AT/RF3, just the capaital letters AT.
I would be very interested to obtain other types from AT, and also original or copied data on their devices. If you can provide any, please
I do not know of any germanium diodes made by Associated Transistors. If you can provide information about AT transistors or diodes, or know where I can obtain more, please