Soviet equivalent of 6L6 with same pinout and similar ratings (Pa_max 20.5W, Va_max 400V) — likely pin-compatible but manufactured to different Soviet GOST standards; verify before substituting
The 6P3P is the Chinese (Shuguang) designation for a 6L6G-class beam tetrode. Written as 6П3П in Cyrillic transliteration. Ratings are close to the original 6L6/6L6G (Pa_max 20.5W vs 19W for original 6L6) rather than the higher-rated 6L6GC (30W).
The Shuguang datasheet specifies gm = 6 mA/V at Va=250V, Vg2=250V, Vg1=-14V, which is slightly higher than the 5.2 mA/V typically specified for Western 6L6 types at the same operating point. Output power is specified as a minimum guarantee (≥5.4W) rather than a typical value.
Pin 1 connects to cathode/beam plates internally. Pin 6 has no internal connection. This matches the glass-envelope 6L6G pinout (on the original metal-envelope 6L6, pin 1 connects to the metal shell instead).
Maximum heater voltage range is 5.7V to 6.9V per the Shuguang datasheet.
Triode-strapped data sourced from Tom Schlangen's 'Pentodes Strapped as Triodes' (2009) table for the 6L6/KT66, as the 6P3P is electrically equivalent.