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Do you feel that the sound of the speakers is a little weak? The sound is a bit strange? Maybe it's time to replace a new tube with your speaker. Of course, the premise of the premise is that you have to have a tube speaker...
Anything that lasts for a long time will be bad. There is nothing in the world that lasts forever. Even the best tubes can cause problems. So, when you are struggling with why your speakers are not the same as before, you need to ask yourself when was the last time you replaced the tubes?
Type of tube
There are three main types of tubes: not all tube speakers are suitable for these three tube types; instead, they need to be selected based on the design of the speaker. A true tube speaker mounts the tube in both the front stage and the power amplifier section, and may also include a tube rectifier or solid state rectifier. Let's take a look at some of the commonly used tubes and some precautions.
Pre-stage tube
This tube is suitable for most tube speakers, and even most "hybrid" speakers will be added to the front tube. While most "hybrid" speakers use a solid-state preamp, the tube is mounted on the output or amplifier section. There are many speakers that use this type of tube, such as the old Music Man speakers produced in the 1970s and early 1980s, and the Fender Super Champ X2.
Pre-stage tubes are also often used in other functions of the speaker, such as Tremolo (which is often mistaken for the functions of many Fender speakers, Vibrato), and sometimes used in reverberation drive and recovery circuits. If the “Reverb†and “Vibrato†functions on your Fender are no longer effective, then you will probably need to replace a tube. In addition to these effects, such tubes are often used as phase splitters, which split the signal into a positive pole and a negative pole to propel the speaker.
Some common preamp tubes include 12AX7/ECC83, 7025, EF86/6267, 12AY7/6072A, 12AU7, 12AT7 and 5751, etc. You can see these tubes in the figure below. Some front-end tubes are covered by a metal casing, which protects the tube to the greatest extent and provides electronic shielding to help reduce noise. If this is the case with your speakers, then you need to make sure that the metal cover is installed after replacing or testing the tube.
Post-stage tube
Usually these tubes are larger in size than the pre-stage tubes; you can find these tubes in the rear stage of the speakers, which will drive the speakers together with the output transformer.
The post-stage tube will gradually become damaged with the use of the latter. Unlike the pre-stage tubes, the power tube changes are very noticeable. If you're using a tube speaker for a long time, try replacing the tube with a post-stage, and you can easily see its improvement in tone. Unlike the pre-stage tube, it is easier to replace the post-electrode tube and adjust and check the bias voltage after replacement.
Common post-stage tubes include 6L6, 6V6, 6550, EL34 and EL84. Unlike preamp tubes, they are never wrapped in a metal shield, but they are usually held in a single slot, so when you replace them, you need to pull them out of the slot.
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Hot Pot
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