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:

I have very few AT devices and I have no original AT data books or sheets. If you can provide me with any please


Associated Transistors transistor

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


Associated Transistors wanted

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:

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


Associated Transistors 2N269

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


Associated Transistors wanted

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