What happens when the transformer we want to use for powering the filaments gives us a too high voltage? In this video I will show three methods for reducing voltage to a safe level, in increasing order of efficiency. ERRATA: at 3:10 I show the pinout of a 12.6 / 6.3 V tube such as 12AX7. Actually, I'm using a 6N2P, which works at 6.3 V on pins 4 and 5.
00:00 Introduction
02:40 First method
07:05 Excessive brightness
08:25 Second method
11:14 Third method
15:54 In other cases ...
17:12 Quick comparison
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