Have these been burned in by you or the manufacturer before shipping?

These tube were purchased because of the really nice prices, they worth the trouble. I'm not sure the seller burned them in the tubes or any one else for that matter. Of the 16 I used, I had multiple failures with in the first few weeks. The failure were all over the place, meaning sometimes just the tube and another times it took a fuse. Do yourself a favor, find a dealer who burns them in and has a good reputation, it may cost a bit more but it will pay off in the long run.

Can these tubes work well with MC275 VI? No bias necessary?

These are great sounding tubes. I have a prima luna amplifier with auto bias, you need to check your owners manual about bias settings for your particular amp.

Where are these manufactured

New production Genalex Gold Lion tubes are assembled by hand in the Reflektor factory in Saratov, Russia

Would these tubes go good with a marshall jcm800 head?

They are some of the best KT88's available today. I haven't used them in a guitar amp, but I bet they'd sound killer in a Marshall.

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Description

🎶 Elevate Your Sound Game!

PRECISION ENGINEERING - Platinum matched quad ensures optimal performance and longevity.
POWERHOUSE PERFORMANCE - Designed for high output, these tubes are the 'King of Power Tubes'.
VERSATILE COMPATIBILITY - Compatible with iconic models like Dynaco Mark III and McIntosh MC275.
UNLEASH SONIC BRILLIANCE - Experience unparalleled audio fidelity with gold plated grid wire.
PACK OF 4 FOR ULTIMATE VALUE - Get a complete set for your audio needs, ensuring you never miss a beat.

The Genalex Gold Lion KT88 Power Vacuum Tube is a premium audio component featuring gold plated grid wire and a tri-alloy clad plate structure, designed for exceptional performance and sound quality. This platinum matched quad pack of 4 tubes is compatible with legendary audio equipment, making it a must-have for audiophiles seeking the best in sound reproduction.

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