TL Audio VTC User Manual
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replacement as they age. When replacements do become necessary, they should be obtained from the
console supplier. ECC83/12AX7A valves are quite commonly available, but the various
manufacturers differ greatly in quality and audio performance, and replacement with the same type as
originally supplied with the console will ensure consistency of performance. After replacing a valve,
the signal path gain should be checked as described in the Calibration Procedure, but no valve bias or
other adjustment is necessary.
2.4. Valve Path Identification.
The Master Valve paths are identified along the rear edge of the PCB (see above).
The channel valves are in line with their respective input modules, and when viewed from the rear of
the console the trimmer for the MONITOR (TAPE) PATH is on the LEFT, and the CHANNEL
PATH is on the RIGHT.