Batilar Depends on how many you have to sell I guess Datasheet Type ECC86 was first introduced in The central screen is visible in the picture as are the anodes from the side. Headphone Reviews and Discussion — Head-Fi. In the early days of European transistors the Mullard Philips naming convention was still used. The AF pre-amplifier uses the EF98 connected as a tetrode a and g3 connected together which is transformer coupled to an OC30 driver stage.
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Print Email Actually, the age of valves is already past — but valves just refuse to go away! If only we could do without the high voltages! However, there is a valve that can manage with only 6 V — the ECC At the beginning of the s, the electronics industry was faced with a problem.
The transistor had just been born, so it was finally possible to build car radios without vibrators and large transformers.
However, the cut-off frequencies were still too low to allow usable VHF mixer stages to be built using transistors. This meant that a valve had to be used in a transistor circuit. This valve was the ECC86, which was intended to be used for shortwave input stages and self-oscillating mixer stages in-car receivers powered directly from the car battery. According to the datasheet, an anode voltage of 6. The heater voltage is always 6. We owe the ECC86 low-voltage valve to this unique bottleneck in the history of electronics technology.
Our circuit is a nearly classical valve audion for the medium-wave range. Power is supplied by a 6-V lead-acid gel battery. The circuit is nearly the same as that of a two-stage amplifier. The first stage provides the demodulation and preamplification. A pF capacitor between the two stages ensures that RF signals will not be further amplified.
Otherwise, the valve might easily recall its original intended use and start oscillating in the short-wave range. A ferrite rod with a diameter of 10 mm and a length of mm, with a winding of 50 turns of enameled copper wire, serves as the aerial. The radio has a good sound and can receive local signals.
In the evening, with a sufficiently long external aerial, it can receive numerous MW stations. It feels just like being back in the good old days.
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