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Product Description
With its backlit voltage meter, color-matched volume and selector switches, and exposed tubes, the Cayin MT-35MK2 Tube Integrated Bluetooth Amp is a beautiful desktop device, aesthetically speaking. However, it’s when you look under the hood that you really see why this thing sings Read More
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So just a 30 day return window and no actual warranty. Why would anyone purchase a $800 amp knowing after thirty days it could become a worthless brick?
Aka_maverickSadly, the only direct replacement for a 5BK7 tube is another 5BK7. Pretty much any other option would require modification of the amplifier, especially with regards to the heater voltage. The 5BK7 tube uses a 4.7v heater, while most potential alternatives use 6.3v or 12.6v heaters.
Best bet if one were to buy this is to immediately start scouring the tube sales storefronts for matched and balanced 5BK7/5BK7A, and buy enough for the expected lifespan of the amp. Good luck there. In theory, most of the 5BK7A tubes should give something around 5000 hours minimum (~2 years of usage 8 hours a day) before they start losing their mojo. Plan accordingly.