Ampeg SVT-VR - Page 8

Survival Tips For Tube Amplifiers:
To prolong tube life, observe these tips and recommendations:
• Match the impedance of your speaker cabinet(s) to your amplifier. Improper impedance matching will contribute to early tube
degradation and may cause premature tube failure.
• Make sure the speaker(s) are properly connected prior to turning on the amplifier.
• After playing the amplifier, allow sufficient time for it to properly cool down prior to moving it. A properly cooled amplifier pro-
longs tube life due to the internal components being less susceptible to the damage caused by vibration.
• Allow the amplifier to warm up to room temperature before turning it on. The heat generated by the tube elements can crack a
cold glass housing.
• Replace the output tube(s) before the performance degrades or the tubes fail completely. Replace the tube(s) on a regular
basis (at least once per year or as often as every 4 to 6 months if you play long and hard every day).
• Always have the bias checked after replacing the output tubes (unless the amplifier is equipped with "self-biasing circuitry").
This should be done ONLY at a qualified service center. Improper biasing could result in the tubes running too hot, which
greatly reduces the life of the tubes – or too cold, which results in distorted sound regardless of level settings. Do not play the
amplifier if it exhibits these symptoms – get the bias checked/adjusted immediately to prevent tube failure and/or other dam-
age.
• If the locating notch on the base of a power tube breaks off, replace the tube. This significantly reduces the risk of damaging
your amplifier by incorrectly inserting the tube.
• Protect the amplifier from dust and moisture. If liquid gets into the amplifier proper, or if the amplifier is dropped or otherwise
mechanically abused, have it checked out at an authorized service center before using it.
• Proper maintenance and cleaning in combination with routine checkups by your authorized service center will insure the best
performance and longest life from your amplifier.
CAUTION: Tube replacement should be performed only by qualified service personnel who are familiar with the dan-
gers of hazardous voltages that are typically present in tube circuitry.
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Important Information About Tubes and Tube Products
SVT-VR Bass Amplifier