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48 TYPE MATCHED PAIR TUBES RCA MARCONI RADIOTRON GREAT AMERICAN TUBE HISTORY, US $98 – Picture 0
48 TYPE MATCHED PAIR TUBES RCA MARCONI RADIOTRON GREAT AMERICAN TUBE HISTORY, US $98 – Picture 1
48 TYPE MATCHED PAIR TUBES RCA MARCONI RADIOTRON GREAT AMERICAN TUBE HISTORY, US $98 – Picture 0
48 TYPE MATCHED PAIR TUBES RCA MARCONI RADIOTRON GREAT AMERICAN TUBE HISTORY, US $98 – Picture 1

48 Type Matched Pair Tubes Rca Marconi Radiotron Great American Tube History

US $98

  • Warszawa, MAZOWIECKIE, Poland
  • Nov 4th
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RCA RADIOTRON MARCONI type 48 power amplifier tetrode Very closely matched pair of tubes These tubes are not just beautiful looking and strong tested tetrodes which have pentode characteristics These are part of Great American Tube History Edward W. Herold The tubes are the first patent of RCA tube designer Edward W.Herold patented October 22 1935 Edward W. Herold first patent – 48 type tube the tubes are in a very nice visual and electrical conditions tested at: f=30V Ua=96V Ug2=96V -Ug1=19V tube 1 - Ia = 56mA tube 2 - Ia = 60mA where 100% for the new tubes is 52mA the tubes probably were never used or used really slightly. tubes have black carbonized anode and solid plate getter USA 6 pins tube base U6A you can see the tube data at one of the pictures the price is for two matched tubes I always send the tubes by priority registered mail with tracking number within hours after receiving payment No More My Lord

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