Mid-price range, these are typically 20Hz to 40KHz minus 1.5dB, IE cored with high-quality silicon steel laminations, wound with oxygen-free copper wire and supplied with either bell-ends or frames. The main cost-saving being the use of a smaller core, specified to the exact power level required, rather than overspecifying by 50 or 100%, as we do on Group B, the winding quality and copper wire is the same.
The quality criteria for group A are 20Hz to 20KHz -1 to -1.5dB, they are IE cored with silicon steel laminations and are supplied with frames and solder tags, which will allow good audio quality at the cost. Economy range, where the price/quality relationship is carefully calculated to ensure audio quality in a compact package.
Audio Note™ valve output transformers are arranged into three categories in order to offer the best possible outputs at different price points, fall into the following:
