... I placed my order for two lightly used Siemens (90 USD + 10 USD for shipment)... I thought, as Gibosi indicate, the Lorenz be maybe too much bassy for my taste... at least with Sylvania or Marconi (waiting for them from Canada)... I have some doubt about how Siemens will work with Tungsol... the 6H8C (Foton) are really punchy, with powerful bass, and clean, maybe for them Lorentz is better, we will see
now I have to try to solve a problem with the power supply... at my home instead of 230Vac I have 240Vac... that give me at the tube 6,7 instead of 6,3... ok 6,3 +/-5% is 6,7 but this is exactly the operating limit specify in Siemens and Telefunken data sheet, for voltage higher then that (slightly higher?) the expected life is specify less then the 10.000 hours otherwise guarantee... uff