User Guide

--27--
Comparison of different tubes
Please refer to the reference chart below for 6922/6DJ8 tubes comparison:
US code EU code
Normal 6DJ8 ECC88
High-end 6922 E88CC
Advanced 7308 E188CC
Exclusive 8223 E288CC
Compatible 7DJ8 PCC88
Unique CCa (unique german code)
**The CCa here is the same as E88CC, which is made of special quality and low noise, and selected out
among E88CC high-grade tubes, with longevity and less noise.
You may directly change the mentioned tubes whenever you like, but E88CC, E188CC, E288CC, CCa is
the best quality tubes among ECC88/6DJ8 series, with longevity and golden pins mostly. (Most modern or
American tubes do not equipped with golden pins)
PCC88/7DJ8 and 6DJ8 are similar in structure, except one thing, and that is the overheating of filament
(7V). It could be used to replace 6DJ8/ECC88, too.