do you have to bias guitar amp pre amp tubes

If you would like to reduce the output of the amplifier then use a power soak. This amplifier is designed to work with four power valves and we would advise you not to remove any of the valves as it will cause damage. This can cause damage to both the valves and the amplifier itself.Ĭan I remove two valves from my 100 watt to make it a 50 watt? If you don’t have your amplifier re-biased then you run the risk of too much or not enough voltage being supplied to the valves.

In simple terms, the bias is an electrical current that must be at the optimum setting to ensure that your power valves run efficiently. Some of our transistor units have an ECC83 valve in the preamp to add tone and colour to the signal. The power valves feed the larger signal to drive the speaker through the output transformer. It then feeds the larger signal to drive the power valves. The preamp valves take the small guitar signal and amplifies and also alters its gain and tone. The number and type varies from one amplifier to another.

Most of our units contain a mixture of valves responsible for preamp or the power amplifier. What do the different valves in my amplifier and combo do? All work that requires the replacement of valves or biasing should be carried out by a qualified engineer.

Do you have to bias guitar amp pre amp tubes