Steve, The Siemens RS1003 is used in the Rohde&Schwarz ( German made ) valve transmitter type SK-010 as described in the Surplusradio bulletin no 18 february 2000 from the dutch surplus radio society
Dear Steve, the RS1003 was in use in telecommunication transmitters. It delivers up to 100W on 100MHz with 800V. I used it 1957/59 as PA, when we had a permit for the 70,2-70,3MHz-band in the IGY ( I