Bedienungsanleitung Ampeg SVT-VR (Seite 13 von 20) (Englisch)

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SVT-VR Bass Guitar Amplifier

Whenever replacing power tube(s):

•Alwayshavetheamplifier’sbiasvoltagecheckedbyaqualifiedservicecenter.Improperbiasvoltage

will cause degradation in performance and possibly damage tubes and/or the amplifier. (See the section

below titled “The importance of proper biasing” for more information on this subject).

•Wehighlyrecommendreplacingthedrivertube(s),aswell.Thedrivertubedeterminestheshapeand

amplitude of the signal applied to the power tube(s) and has to work almost as hard as the power tube(s).

You may check the preamplifier tubes for microphonics by turning the amplifier on, turning up the gain and

tapping lightly on each tube with the end of a pencil or a chopstick. You will be able to hear the tapping

through the speakers, which is normal. It is not normal for a tube to ring like a bell after it is tapped. If it

does ring, then it is microphonic and should be replaced. Remember to use only high quality, low

microphonic tubes in the preamplifier section.

Even though power tubes are rarely microphonic, they should be checked, anyway. The power tubes may

be checked for microphonics just like the preamp tubes.

In the case of very high gain amps, you may be able to reduce the amount of noise generated by simply

swapping the preamp tubes around.

The importance of proper biasing:

For the best performance and longest tube life, proper biasing is imperative. Bias is the negative

voltage which is applied to the power tube’s control grid to set the level of idle current. We cannot over

emphasize the difference in warmth of tone and dynamic response that come with proper biasing. If

the bias is set too high (overbiased), the sound from the amp will be distorted at all levels. If the bias is

set too low (underbiased), the power tubes will run hot (the plates inside the tubes may glow red due to

excessive heat) and the sound from the amplifier will lack power and punch. The excessive heat greatly

reduces tube life – from a few days to as little as a few hours in extreme cases. Setting the bias on the

amp is like setting the idle on a car. If it’s too high or hot, it’s running away with you and if it’s too low or

cold it will choke when you step on it.

The bias is adjusted at the factory in accordance with the type of power tube(s) installed in your

amplifier. It is important to point out that tubes of the same type and specification typically exhibit

different performance characteristics. Consequently, whenever power tubes are replaced, the bias

voltage must be checked and re-adjusted to accommodate the operating parameters of the

replacement tubes. The bias adjustment should be performed only by qualified service personnel

with the proper, calibrated test equipment.

The nature of tubes continued...

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Ampeg SVT-VR Seite 13

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