Emission Labs 81 Ensretter rør - Pris per stk.

81 Mono Diode Description

The 81 was historically intended for use with the Type 50 tube. The 81 is a classical mono diode for relatively high voltage, such as found with large directly heated triodes. Normally two 81 tubes are used for full wave rectification. The heaters of two tubes should be put in parallel, thus the equivalent of a normal dual diode will result. In this configuration It can produce conveniently an output voltage of 500....700 Volt, at maximum 170mA. Other than dual diodes such at 5U4G, a pair of 81 can be used at maximum voltage and maximum current at the same time.

Note, it takes two 81 monodiodes to build a rectifier circuit, which is actually more powerful than a 5U4G circuit.

The EML tubes feature a series connected filament for both diodes togetherm, which has certain advantages.

This tube can supply 140mA with a normal C-L-C filter. The 274A and 274B are designed for Audio purposes, and best use is with a small size first capacitor.

The EML 274 is also specially suited for applications with relatively high DC voltage. The new ceramic sockets we use sind 2011, are make this possible.

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
Soft rubber suspended tube base
Hard metal Construction (Note1)
Two extra large getters
Hand blown Glass bulb
These tubes are shipped in a high quality dual box
Tube printing with real gold (metal), red color is glass burned into the glass

Sound Character of the 81
We try to answer this question if posssible. The 50 triode will give it's best performance at a relative high voltage. The 81 diode has a larger anode distance as useual. This makes the impedance higher, and the characteristic of this tube softer. The 81 diode is the most genuine tube to use together with the 50 triode, since it was originally designed fot this use. Also constrictionwise the 81 looks a lot like the 50 itself. When using this tube, the whole amplifier comes with 7.5 Volts heaters, which have a nicer glow appearance then the 5V heaters.

To a construct useual dual rectifier, the heaters of two diodes are connected in parallel.

For very small amplifiers, such as head phones, it is possible to use just one monodiode.

Mere information HER

Varenr. 110-039-90