The early semiconductor industry in West Germany was very active, with several major manufacturers, notably Siemens, Telefunken and Valvo. There were also a number of interesting smaller companies that eventually disappeared.

I am seeking to buy germanium transistors made in Germany in the 1950's and 1960's. I am looking for transistors listed below. I also want to buy original data sheets for them.

If you know about these transistors, or have have some for sale or trade, please

Ich suche, die Germaniumtransistoren zu kaufen, die in Deutschland im Jahren 1950's und 1960' s hergestellt werden. Ich suche nach den Transistoren, die durch die Hersteller hergestellt werden, die nachstehend aufgeführt werden. Ich möchte auch ursprüngliche Leistungsblätter für sie kaufen.

Wenn Sie in diesen Transistoren auskennen oder haben, einiges für Verkauf oder Handel zu haben, in Verbindung.


ED704 radar diodes

The oldest German devices that I possess are these small radar diodes, left behind in Norway by the Wehrmacht. They date from 1944. I don't know the manufacturer (possibly Telefunken) or possess any other data on them (types ED702 and ED704) so if you do, please


wanted

The very earliest transistors and non-radar diodes from Germany were made by a somewhat mysterious company called Dr. Rudolf Rost, from Hannover, in 1952. These are described in their publication "Kristalloden Technik". I am seeking any semiconductor device from this manufacturer, particularly the transistors GT 10, GT 20 and GT 30. If you know about these or have any for sale or exchange, please


VS2OO transistor

Other early transistors are the Süddeutsche Apparate Fabrik (SAF) types VS200 to VS202, which are typical point-contact transistors with one lead at one end. They went on to make junction types OC110, OC120, and OC130.

DS55 diode

They also made diodes DS55, DS60, DS61, DS80, DS160, DS601, DS602 and DS1604. My image shows a DS55 point-contact radar diode.

If you know anything about SAF devices or have any for sale or exchange, please


Valvo germanium devces

The manufacturer Valvo made many early types of germanium transistors and diodes. They were a subsidiary of Philips of the Netherlands, like Mullard in England and La RadioTechnique in France. The same devices, in the classic OA and OC series, were made by all these companies, differing only in the manufacturer name and country of manufacture printed on them. I describe them on my Mullard page, so will not repeat the information here, but show an image of some Valvo examples.

I am very interested to obtain examples of the Valvo power transistors OC15 and 100OC. If you know about these, please


Intermetall logo

Another key manufacturer in Germany was Intermetall, founded by Herbert Franz Mataré, who invented the transistor independently of Bell Labs. Intermetall made several point-contact transistors and numerous junction types as well as diodes. I plan to create a separate page for them soon.

I wish to buy any Intermetall GSN type, which includes GSN1 to GSN6. I am also interested in the power transistors X-125, X-122, X-120 and any very early type or data sheet.

Ich möchte irgendeine Intermetall GSN Art kaufen, die GSN1 zu GSN6 umfaßt. Ich werde auch an den Energientransistoren X-125, X-122, X-120 und irgendwie sehr frühe Art oder Leistungsblatt interessiert.


Telefunken logo

The manufacturer Telefunken also made many early types of germanium transistors and diodes, creating their own members of the OA and OC series. I have created a separate page for them.

I am very interested to obtain examples of the Telefunken OC601 and OC602 in the original flat package. If you know anything about these devices or have any for sale or exchange, please


Siemens logo

The electrical giant Siemens also made many early types of germanium transistors and diodes, using their own series. I have created a separate page for them.

I am very interested to obtain examples of the Siemens point-contact types TS13 and TS33, which are packaged in the typical cartridge case. I am also interested in very early Siemens power types such as TF95, old audio types like TF70 or TF71, or any original data sheet.


TKD transistors

Another smaller manufacturer was TeKaDe, often shortened to TKD. I have created a separate page for them.

I am very interested to obtain examples of the TeKaDe point-contact types GST01 and GST02, which are packaged in the typical cartridge case. I am also interested in any original TeKaDe data book or sheet.


SEL transistors

One oddity that I have come across is a number of transistors and diodes as shown, with labels covering up the original markings. The labels bear the three-legged symbol shown on the rightmost transistor, plus a part number starting with WN. The underlying types are usually germanium devices made by Valvo, but a few are made by the English firm STC. The symbol/logo is that of Standard Elektrik Lorenz (SEL).

Why this company should have re-branded and presumably re-sold transistors and diodes from other manufacturers is a mystery to me.If you know about this, please






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