10Y (Type 10) Vacuum Tube – Directly-Heated Power Triode for Single-Ended Audio

The 10Y (also cataloged as Type 10, VT-25, UX-210) is a classic directly-heated power triode from RCA, prized today as a driver or output tube in boutique single-ended audio amplifiers.

• Tube type: Directly-heated power triode
• Base: UX 4-pin
• Filament: 7.5V, 1.25A (DC recommended)
• Typical use: Driver or low-power output tube in single-ended audio amplifiers; historically an early-1930s general-purpose power triode

Also cataloged as Type 10, VT-25, and UX-210 — same tube across all four designations.