Reference tube is tested first then the tube listed for sale.
2pcs= 1 matched Shuguang 50 years Treasure 300B-Z tubes 300B Audio HIF Valve Custom Duties & Taxes Price does not including tax, we are not responsible for any tax, thanks for your understanding!.
THEY DO NOT WORK. PARTS ONLY
Visually in very well maintained condition, should hardly be better to get. Your statutory rights are not limited by this warranty.
70 Years of Radio Tubes and Valves 2nd Ed. John W. Stokes Book Original . Original Manual / Copy: Original.