e.g. for use of 2A3 (UX4 standard) with 8-Pin (AO8) socket to replace the discontinued Shuguang 2A3 8-Pin version or other triodes (make sure to check for correct pinout before using)
UX4 pin #1 auf AO8 pin #2 (filament)
UX4 pin #2 auf AO8 pin #3 (anode)
UX4 pin #3 auf AO8 pin #5 (control grid)
UX4 pin #4 auf AO8 pin #7 (filament)
notE: not suitable for rectifier tubes!! see p/n s8S-C4
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