Will these make my 15 watt Vox Night Train sound much better?

Depends upon the condition of the existing valves in your amplifier. If the valves are well used and near the end of their life there ought to be a significant improvement. If they are new and the original valves supplied as stock you might perceive there to be some improvement but I would doubt that it would transform the amp in such a way it could be described as being "much better".

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🎶 Elevate your tone with vintage power—because your sound deserves the spotlight!

LIGHTWEIGHT COMPACT - At just 9g and pocket-sized, it’s perfect for gigging musicians on the move.
BEST VALUE TUBE ON MARKET - Premium quality without premium price—upgrade your rig without breaking the bank.
PLUG PLAY COMPATIBILITY - Seamlessly fits standard 6.35mm guitar amps for effortless upgrades.
CONSISTENT SONIC PERFORMANCE - Engineered for stable, high-quality sound throughout its lifespan—no surprises on stage.
VINTAGE TONE MODERN RELIABILITY - Experience classic warmth with a tube design trusted by pros for decades.

The Jj Electronics T-12At7-Jj Vacuum Tube is a durable, high-quality ECC81/12AT7 tube designed for electric guitar amplifiers. Delivering 20 watts of power through a compact 6.35mm jack-compatible design, it offers consistent vintage-inspired sound performance with long-lasting reliability, making it an essential upgrade for serious musicians seeking classic tone and dependable quality.

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Product Dimensions	6.35 x 2.54 x 2.54 cm; 9 g
Item model number	T-12AT7-JJ
Colour	clear
Compatible Devices	Guitar
Connector	6.35mm Jack
Material Type	Glass, metal, potentially ceramic
Output Wattage	20 Watts
Power Source	Corded Electric
Item Weight	9 g

Jj Electronics T-12At7-Jj Vacuum Tube Ecc81 Electric Guitar Power Amplifier

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