After several successful years, it was also time for our reference preamplifier SA-T7 to be revised. As with our integrated amplifiers from the TubeLine, we have modernized the design and removed the chrome rings. In addition, we have added a Bluetooth input (Vers. 5.0) to the preamplifier. Thus, music can easily be transferred from any mobile phone or tablet to the amplifier.

Still used is the BestPentode-circuit by Dipl.-Ing. Frank Blöhbaum, which eliminates the electrical current noise typical for pentode tubes. Because modern signal sources have different requests to the transmission quality of an amplifier, traditional (classical) circuit technology and ECC81/82/83/88 does not cover the full potential of tube technology. The BestPentode stage we use has a much higher gain with less noise than comparable triodes.

The E180F / 6SCH9P / 6SCH51P grid pentodes used in the SA-T7 MK can thus develop their full potential. The tubes are a new old stock (NOS) from storage that was used for amplifying highfrequency signals 24/7 in telecommunication.