Emission Labs 80 Mesh Ensretterrør - pris per stk.

Description
The 80 rectifier tubes is intended for radios or small amplifiers. This diode is a smaller version than the 5U4G, intended for lower DC output current, and lower voltage.

The maximum value for the first capacitor is 20uF, which is lower than with 5U4G, however since the 80 is intended for maximum 135mA, the value of 20uA is sufficient. Output ripple is also lower because of higher Anode impedance of this tube. It must be said if you are working at the lower current such as below 135mA, the 80 is a very good choice.

Guarantee program for first owner.
At EML we have the normal guarantee. In addition to that, the first owner can register the tube within 4 weeks after receival, at the Emission Labs ® website, to participate in the 5 years guarantee program.

Features
Hard metal filaments, series connected.
Each tube is numbered, inside the bulb with a metal Tag
Hand blown, Globe shaped glass
Two extra large getters.
These tubes are shipped in a high quality dual box or single box for rectifiers.
Tube printing with real gold (metal), red color is burned into the glass.
Gold Plated pins, black ceramic UX4 socket.

Sound Character

The 80 rectifier was intended for small radios, where it cooperated with output tubes like the 45 Triode and 47 pentode. Radios internally useually operated at 250V DC. This voltage was easy to achieve, and enough for amplifier tubes. However for a triode as output tube, 250V was a compromise in terms of output power. Otherwise the whole radio had to be designed for higher voltage, which was more expensive. Yet for higher output, a higher working voltage of 275V was used, as found in more expensive radios and audio amplifiers. The 80 tube was designed for both applications, and still today an ideal choice for small HiFi amplifiers, or pre amplifiers. It can be regarded as a smaller version of the 5U4G, but the 80 has higher plate impedance, which is of advantage for low hum circuit design.

The maximum capacitor value for the 80 tube was limited at 20uF. The 80 rectifier is quite robust, because the relation of maximum capacitor value compared to the heater current is very good. For this reason, collectors often find the original 80 rectifier still working in old radios.

Overall it can be said, the 80 rectifier is a very reliable tube, and comfortable for the electronics designer, due to it's relatively high possible first capacitor. Yet this tube is characterized by somewhat higher dynamic resistance, thus reducing power supply hum, and radiation of hum into other parts of the circuit. Also for head phone amplifiers, it makes this tube is a very good choice.

Mere information HER

Varenr. 110-037-41