![]() Then you choose a power transformer that can deliver the power needed for your chosen output tubes and load impedance. Before you can complete your amplifier you should choose the output tube that you want to use, and then choose an output transformer to match that tube. The output transformer is then ordered to match the tube. Most builders already have an idea of which tube they will use before building an amplifier. It is expected that most users of this board will be building an SE amplifier. This and other applications are discussed further on the Tubelab web site. The board can also be used as a driver board for a larger amplifier. The standard parts that are called out in the parts list (or supplied in the kit) are designed to accommodate these tubes in a SE amplifier configuration with no modifications. ![]() I have used 45’s, 2A3's, 300B's and NX-483's in the same amplifier without any parts changes. The board has been successfully been used as a stand alone SE amplifier with several types of output tubes. This amplifier board was designed with flexibility in mind.
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