【Excellent Condition / Used 1 Hour】 Vacuum Tube 6K4 (Set of 2) FX-AUDIO- Accessories

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This is a set of two 6K4 vacuum tubes that came with the FX-AUDIO- TUBE-00J.

[Model Number & Specifications]

Model Number: 6K4 (Made in Beijing)

Quantity: Set of 2

[Product Condition & Usage Frequency]
These are like new tubes, used only for initial operation check upon product purchase, with less than 1 hour of actual use.
They were immediately replaced with different vacuum tubes (upgraded versions) after the operation check, so these have been carefully stored.
Of course, it has been confirmed that they were operating normally (producing sound) before removal.

[Example Compatible Models]
Can be used with FX-AUDIO- models such as TUBE-00J, TUBE-01, TUBE-03J, TUBE-04J, as well as preamplifiers and headphone amplifiers from various manufacturers that use 6K4.
(*Please confirm compatibility yourself before purchasing.)

[Packaging & Shipping]
As these are very delicate glass products, they will be carefully packaged as follows.

Shock Absorption: Each tube will be individually wrapped in thick cushioning material (bubble wrap).

Boxed & Waterproof: The vacuum tubes will be placed in a small box to prevent movement within the packaging, and shipped with waterproofing measures.

[Notes]

Due to the nature of vacuum tubes, we cannot guarantee compatibility with your equipment or guarantee against minor noise.

Immediate purchase is welcome. How about using them as spares or for tuning? Thank you.