Description. It is commonly assumed that the Russian 5Ц4С (5U4S) rectifier is equal to the western 5Z4G, and its true! The only difference compared to a vintage Brimar is a slightly higher peak inverse voltage at 1400v in stead of 1350v for the 5Ц4С. Russian audiophile 4P1L tube with direct heating & lowest anode voltage. The pentode is fine up to 100 Mc/s. Made by SVETLANA plant. Equivalent to the 4L1S / 4LS1.

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