JJ EL 34 Duet Power Tubes matched
EL 34 JJ Duet Power Tubes matched
You are ordering a duet of JJ electronic EL34 power tubes, so 2 pieces.
The JJ EL 34 is a very good and robust tube made of European production with a very balanced sound and is a good replacement for all common EL34 types. The JJ EL34 is manufactured in the Slovak Republic and brings powerful bass, punch in the middle range and clean heights with it.
In the course of time, the amplifier tubes loos their sound. The volume is not the problem, but the sound. The heights are no longer so beautiful and the bass range also suffers. Power amplifier tubes should be replaced from time to time.
In guitar amps You should always use matched tubes. Matched tubes are tubes with the same values. Tubes deviate from the values much more than semiconductor components. Therefore, one should measure each individual tube and write down the values. Then the tubes of the same values are combined, that is called matching. In tube amplifiers, one tube usually amplifies the upper half-wave and the other tube the lower half-wave of the AC voltage signal. If you have an amp with more than 50 watts, several pairs of tubes are used. If you do not use measured tubes, the power amplifier tubes work unbalanced. The current of individual tubes can rise too much, so that they overheat, the tubes can go defective, the anode resistor can burn through. The output transformer can be affected as well... etc.
Please always use measured, matched tubes.
The tubes you can buy from us are measured by JJ Electronic and then a second time checked and measured again by us. So you can be sure that our tubes fit. And that all the tubes that leave our house are guaranteed to work and sound very good.
On each tube are the values, so you can buy only one tube more. This only makes sense if the tubes are not too old, because in the course of the operation the values of the tubes change. If you are setting up new power amplifier tubes, you should normally set the bias current new. This is done with a special bias meter. With this you can measure the current flowing through the tube and then you can set the appropriate bias on the amp.
If you want to swap tubes and do not have such a measuring device, you can also send us your old tubes and we measure them and then send you suitable new tubes, then you only have to replace the new tubes. This only works if the amplifier has working properly before. If the tubes were broken due to incorrect bias settings you have to go to the specialist and let the new tubes be adjusted. Many musicians simply exchange their matched tubes without having to measure them, of course you can do that too. In most cases, this is good, but we cannot guarantee it.
Typical values of one JJ E34:
Power max 25W
Heating voltage 6,3 V
Heating current 1,5 A
Anode Voltage 250 V
Grid 1 -10 to -13,5 V
Grid 2 265 V
Grid 3 0 V
Anode current 100 mA
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