Description

LAST STOCK CLEARANCE. AS-IS. 

• These last stock Treasure BLUE bottle KT88-Z CB (CB stands for ‘cobalt blue’) tubes were stashed away from our past wholesale dealing with the state owned Chinese tube manufacturer – ShuGuang.
• Originally acquired as a special GF-Select production run with ‘enhanced plate emission’ capacity.
• These are NEW tubes, but may have some cosmetic imperfection including but not limited to: no logo or no tube model prints on the tube (some of our past wholesale customers requested no print in order to apply their own custom logo); minor scuffs on the tube base collar or pins from testing / plugging into industrial testing equipment. These cosmetic imperfection do not affect tube function whatsoever.

Please read below description of EACH LOT,  then select from dropdown list for your order of specific LOT # (A, B or C) : 

LOT A: 1 matched pair  = 2 tubes

• This pair of tubes have tested 93% of full emission. Strong tubes.

LOT B: 1 matched pair = 2 tubes

• This pair of tubes have tested 83% of full emission – rated as ‘moderate’ and just falls outside of our top grade tubes (for KT88 – top grade rating starts from 85% to 110%). Typical tube factory QC pass KT88 tubes have emission starting from 70-75%.

LOT C: 1 matched pair + 1 backup Single = TRIO Set = 3 tubes 

• This TRIO set of tubes have tested 86% of full emission – falls into our top grade tubes (for KT88 – top grade rating starts from 85% to 110%).

Suggested Break-in Time:

Please note: This tube requests extended break-in time to sound to the best. Recommended 150hrs.