Tubes can be replaced by other tubes, different tubes with different sounds. Such as GE jan 5654w https://bit.ly/41MMqEP, it has more body + warmth.
T3：Russian ECF80 tubes = Chinese 6F1 tube; Russian ECF82 tubes = Chinese 6F2 tube; It cannot be replaced with 5654w tube.
If you have any questions or concerns, please don't hesitate to contact support@fosiaudio.com.
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