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Christmas balls by STC
December 22nd, 2025 13:23
Love the look of these.. 
Filament color is perfect. Genuine old quality.
A preamp. An 0A2 per channel sets the high voltage and bias for the 4101D. No electrolytics, only a 10nF cap bypassing the VR-tube..

STC 4101D
STC 4101D