MATCHED QUAD 4P1L /4LS1 /RL2 /4P6

RUSSIAN SVETLANA PENTODE TUBES!!!

<OTK> marked

DATE OF MANAFACTURED: 1980's

Each tube is heated at least one hour before testing, for an even better measurement accuracy (In the description photos one can see both the tubes, and the tube tester, during the heating and the testing process)


This tubes were tested on high end russian military tube tester L1-3 by a qualified engineer!


  • Name: 4P1L;
  • Type: pentode;
  • Application: oscillation and power amplification up to 100MHz;
  • Cathode type: oxide,direct heating;
  • Envelope: glass;
  • Mass, g: 35;
  • Filament voltage, V: 2,1/4,2;
  • Filament current, A: 0,65/0,325;
  • Anode voltage, V: 150;
  • Anode current, A: 0,06;
  • Anode power, W: 7,5;
  • Grid2 voltage, V: 150;
  • Grid3 voltage, V: 0;
  • Steepness, mA/V: 4,5-7,8;
  • Microphonic noise, mV: 500;

  •     Socket type RSH7