Analog Metric C22 User Manual page 7

[C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER
Figure 3: Connection of power supply by the tube voltage regulator to the C22 preamp.
5. To power up the input selector board and the delay protection board, the power
supply ~12V DC can be obtained from the positive terminal of C13 or from the
low voltage part of the tube voltage regulator, either J6 or J7 of tube voltage
regulator board.
6. Connect the output (marked with Ro+ and Lo+) of input selector to 23 step
attenuator and the output of 23 step attenuator to C22 preamplifier as in Figure 5.
7. Finally, wiring all the connections according to Figure 5
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