![]() Most will work well for several years, but occasionally one will fail prematurely for no apparent reason. Preamp tubes-in terms of reliability-can be thought of a bit like lightbulbs. Most modern amps are designed around 12AX7 preamp tubes, which have a very high gain factor, and generally the brands that tend to be fitted at the factory (common ones include JJ, Ruby, Sovtek and Shuguang) are robust and will perform well. They are often-but not always-hidden behind metal sheaths that are there primarily to reduce microphonics. These are the smaller tubes that you can see on your amp's chassis.
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