Soviet electron tube 6N6P double triode with gold grid. High current, low distortion driver for SE & headphone amps. Replacement: ECC99, E182CC, 6N6 (China). NEVZ (Novosibirsk) NOS
Russian tube 6K4P-EV - military-grade remote-cutoff pentode for HF amplification. Designed for RF and IF stages with automatic gain control (AGC) and vintage audio compressors. A direct, drop-in replacement for Chinese 6K4 (Shuguang) tube. Manufacturer: NEVZ (Novosibirsk) / NOS
Russian 6N1P-VI tube high-quality double triode. Low noise and microphonic effect. Optimised for "pulsed" mode of operation. Equivalent to the 6DJ8, ECC88, 6922