User Guide

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Substitution of tube
The following tubes can be used on the AX4B-533 Tube for those of whom looking for different tonal
characteristics or just replacing the tube.
General speaking, a low output tube such as the 6922 will have about 5,000~6,000 operating hours life
span. If you use it 4 hours a day, it will probably last for over 4 years. Of course, many factors also determine
the life of a tube including working voltage, temperature, vibration…etc.
Here is the substitute tube list for Sovtek 6922:
Jan-Philips 6922
Russia 6922 / 6H23
Siemens E88CC / 6922
6N30 or 6N30P
Telsa E88CC / 6922
Telefunken E188CC / CCa
Telefunken E88CC / 6922
Telefunken PCC88 / 7DJ8
Siemens E288CC
Siemens 7308
Sveltana 6N1P
Philips E80CC
Philips E88CC / 6922
MiniWatt ECC88 / 6DJ8
Amperex ECC88 / 6DJ8
Mullard E88CC / 6922
Mullard CV2492 / E88CC
Mullard CV2493 / E88CC-01
Mullard E188CC / 6922
Sylvania 6922 / E88CC
Sylvania 7308 / E188CC
AEG E88CC