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[C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER
MANUAL]
Analog Metric
illustrated in Figure 2. Then, use a metal wire to short the connector L1 (displayed as
yellow line)
3. Plug in the vacuum tube EL84 and 6J8 (EF86), and turn on the power supply.
Measure the output DC voltage at J4. Adjust the resistor trimmer VR1 of tube
regulator board so that the output voltage reaches 290V DC. This 290V is the B+
voltage for C22 preamplifier.
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