How to Retube a Peavey Classic 30 Amp

Written by robert russell
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How to Retube a Peavey Classic 30 Amp
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Peavey began manufacturing the Classic 30 amplifier in the 1990s. It combines the sound of vintage Fender amplifiers with the gain and crunch of more contemporary guitar amps. This makes the Classic 30 a very versatile amplifier. It is a 30 watt amplifier with one 12 inch speaker. Consequently, it is very portable. It is powered by four power tubes and three preamp tubes. This provides the Classic 30 with a wide range of sound. It produces a nice clean and crisp clean tone and it can also generate heavy and dirty tones as well. Tubes wear out and need to be replaced from time to time. Guitarists also like to experiment with tubes to find the perfect tone.

Skill level:
Moderately Easy

Things you need

  • 4 EL84 power tubes
  • 3 12AX7 preamp tubes
  • Contact cleaner
  • Brush
  • Cloth

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  1. 1

    Purchase the proper tubes for the Classic 30. All amplifiers are wired for specific tubes. Using the wrong tubes can damage the amplifier. The information is written on the tube in a combination of letters and numbers. The Classic 30 uses four EL 84 power tubes and three 12AX7 preamp tubes. Tubes may be purchased from different dealers. Some guitarists love replacing their tubes with vintage tubes. Other guitarists swear by tubes made in China and Russia.

  2. 2

    Remove the old tubes. Don't remove the old tubes while they are hot or warm. If a tube goes bad at a gig, allow it to cool down before removing it. To remove the old tubes, gently twist and pull them from their sockets.

  3. 3

    Clean the tube sockets with contact cleaner. Spray contact cleaner into the sockets. Clean out grime and debris with a small brush. Wipe the socket with a dry cloth.

  4. 4

    Install the new tubes. Align the notch on the tube with the notch in the tube socket. Gently push the tube in place and twist it in a clockwise motion. Repeat the process until all the tubes are installed.

  5. 5

    Try out the tubes. Plug the guitar into the Classic 30 and turn it on. Play the guitar at different volume levels. New tubes should have lots of power and produce warm thick tones. Muddiness and a lack of power indicates that the tubes are not functioning properly. Also examine the colour of the power tubes while they are on. They should be glowing with a medium orange colour.

Tips and warnings

  • When you replace all the tubes in your amp, they should be biased by a professional technician. This provides a longer lifespan for the tubes and effects the overall sound quality of the amp.
  • The general rule of thumb is that power tubes should be replaced twice as often as preamp tubes. If you are using your amp on a regular basis, the tubes should be replaced every one or two years. However, tubes are unpredictable and fragile. Don't be caught off guard at a gig. Keep spare tubes in your gig bag.

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