Bedienungsanleitung Ampeg SVT-VR (Seite 12 von 20) (Englisch)

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SVT-VR Bass Guitar Amplifier

Power tubes

are the largest tubes used in an amplifier, generate the most heat and wear out the fastest.

These tubes convert the low-level, conditioned signal from the preamplifier into a level that is sufficient to

drive the speakers. There are several types of power tubes available, each of which offers a different per-

formance/sound characteristic. For example, the EL34 power tube produces a great classic rock sound.

When an EL34 is driven into distortion, it produces a unique sound (“crunch”). When compared to the 6L6,

the EL34 distorts more quickly, exhibits a “looser” low-end response and produces more harmonics at mid

and high frequencies (“creamier” sound). These differences become more noticeable at higher volumes.

The 6L6 tubes produce a big low-end thump and have very good dynamic range. They offer a more tradi-

tional “American Rock” sound. The 6V6 tubes produce a creamy sound with nice distortion. On the other

hand, the KT88 produces a big low-end but sounds more like an EL34 in the mid and high frequencies.

The 6550 power tubes are more rugged and stay cleaner sounding, even at full power. When they do dis-

tort, the sound produced is more solid and has a tighter low end; more of a “heavy metal” type distortion

with lots of power.

Some power tubes are available in matched sets. These tubes have been extensively tested for optimum

performance and longevity.

When replacing power tubes, please replace them with a tested, matched pair and have the amp rebiased

by a qualified service center. It is possible to change the sound of the amplifier by changing the type of

power tubes. When making any modification to your equipment, it is highly recommended that you consult

with a qualified service center.

The nature of tubes – why (and when) to replace them:

Tubes are made up of a number of fragile mechanical components that are vacuum-sealed in a glass

envelope or bubble. The tube’s longevity is based on a number of factors which include how hard and

often the amplifier is played, vibration from the speakers, road travel, repeated setup and tear down, etc.

Any time you notice a change in the amplifier’s performance, check the tubes first.

If it’s been awhile since the tubes were replaced and the sound from the amplifier lacks punch, fades in

and out, loses highs or lows or produces unusual sounds, the power tubes probably need to be replaced.

If the amplifier squeals, makes noise, loses gain, starts to hum, lacks “sensitivity”, or feels as if it is

working against you, the preamplifier tubes may need to be replaced.

The power tubes are subjected to considerably more stress than the preamplifier tubes. Consequently,

they almost always fail/degrade first. If deteriorating power tubes aren’t replaced, they will ultimately fail.

Depending on the failure mode, they may even cause severe damage to the audio output transformer

and/or other components in the amplifier. Replacing the tubes before they fail completely has the potential

to save time, money and other unwanted troubles. Since power tubes work together in an amplifier, it is

crucial that they (if there is more than one) be replaced by a matched set. If you are on the road a lot, we

recommend that you carry a spare matched set of replacement power tubes and their associated driver

tubes.

After turning off the power and disconnecting the amplifier from the power source, carefully check the

tubes (in bright light) for cracks, white spots inside the glass or any apparent damage. Then, with the

power on, view the tubes in a darkened room. Look for the preamplifier tubes that do not glow at all or

power tubes that glow excessively red.

Tube types and usage continued...

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