Laney L5-STUDIO Manuel d'utilisateur télécharger pdf (Page 15)

Tube Amplifier Survival Tips

• Tube amplifiers generally sound much warmer/sweeter than solid state transistor amplifiers, but they also need a little more

respect due to the fragile glass tubes themselves. The L5-Studio uses top quality tubes, which should give you years of trouble

free service. However like all tube amps, it is important to treat it with a certain amount of care.

• Tubes are fragile glass components and can easily be damaged if not treated with respect.

• Make sure the impedance of your cabinets matches your amplifier. Improper impedance matching will result in reduced

output power output and compromised sound at best, with amplifier failure/premature tube failure at worst.

• Allow the amplifier to warm up to room temperature before switching it on. If you don’t the sudden thermal shock can

crack the cold glass tube housing plus any moisture is bad news around high voltage electronics.

• Allow the amplifier to cool down before moving it. Hot tubes are more susceptible to damage than cool ones. A tubes

life expectancy is based upon a number of factors which include operating temperature, how hard and how often it is played,

vibration due to travel etc. Although there isn’t a specific interval for replacement, tubes should be changed if you notice any

degradation of performance.

• Typical problems with pre-amp tubes can be a crackly noise, hiss, hum and microphony. Other symptoms include sound

lacking in punch, extreme highs or lows and low level hum. Internal failure of the tube can also blow the HT fuse. See the diagram

on page 17 to see how to check the tube grade fitted. Exact replacement pre-amp and output tubes are available from Laney via

your dealer.

• To change a tube switch off the unit and unplug from the mains supply. Wait for the tubes to cool down. Lay amplifier down

on its front face and remove the protective grille held in place with four screws. You should now be able to access the amplifier

chassis. Pre-amp tubes are protected with a screen can. To remove gently twist the screen can anti clockwise and then pull up.

The tube can then be gently pulled out. Take care when pushing the new tube in to make sure the pins are all aligned properly.

Output tubes have a spring retainer which must be pulled away before the tube will come out.

• Amplifier connection. In order to avoid damage, it is advisable to establish and follow a pattern for turning on and off your

equipment. Connect and power up all system parts, (effects processors, FX pedals etc.) BEFORE turning on your guitar amplifier.

Many products have large transient surges at turn on and off which can cause damage to your speakers. By turning on your guitar

amplifier LAST and making sure its Volume controls are set to minimum any transients from other equipment will not reach

your loudspeakers.

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Laney L5-STUDIO Manuel d'utilisateur Page 15