Tnx William! 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
Thanks Walter - this is most helpful. 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 fo