Vintage Soviet Uylanov 6C33C-B power tube

The Soviet 6C33C-B (or 6S33S-V) is a high-power, low-mu military dual triode originally designed for voltage regulation in MiG-25 fighter jet radar systems. Known for extreme ruggedness, high transconductance, and low impedance, it is highly sought after in high-end audio for OTL and single-ended amplifiers, often producing "warm" and powerful sound.

For Balanced Audio Technology VK-55, VK-60, VK-75, or VK-150 amplifiers.