Two ULTRA RARE vintage Siemens Klangfilm tube amplifier type Rfv.10. VERY EARLY amplifier - made in 1926! Made for PROFESSIONAL use.As far as I can see it is one SINGLE ENDED power amp (working with one RE604) plus one BOOSTER amplifier (working with RV218 tubes). If I see right booster amplifier works with SIX (6) ouptput tubes! In my knowledge the amplifiers need a separate power supply (not included in this auction). But no guarantees that this is all correct. All power tubes are missing. See pictures.Fair condition for the age. See pictures. Because of the very high age NOT tested. Sold AS IS!HARD to find now! So DON'T miss Your chance!NOTE: this auction is for two MONO amplifier (one SE amp and one booster) !