selected preamp tube ECC83WA (RT095)
selected preamp tube (RT001)
selected preamp tube 12AT7 / ECC81 (RT002)
selected preamp tube ECC83WB (RT093)
selected preamp tube 7025 / E83CC (RT030)
selected preamp tube (RT003)
selected preamp tube (RT006)
selected preamp tube (RT009)
selected preamp tube (RT046)