Tube Tech MEC 1A Recording Channel - Manual (Page 5)

Lydkraft ApS
Mose Allé 20, DK2610 Rødovre
Denmark
5
ADJUSTMENT PROCEDURE:
(980810)
CAUTION:
Before making any adjustment let the unit heat-up at least 30 min.
Always check the DC voltages at the power supply.
ADJUSTMENT OF PSU:
1) The DC voltage in TP202 shall be +240V.
Adjust with P201.
2) The DC voltage in TP203 shall be +150,0V.
Adjust with P202.
3) The DC voltage in TP204 shall be -150,0V.
Adjust with P203.
ADJUSTMENT OFFSET IN TUBE-OP-AMPS:
1) The DC voltage in TP1 shall be < +/-50mV.
Adjust with P1.
THE GRE SHALL BE MARKED BETWEEN 1.005-1.175
ADJUSTMENT OF BASIC GAIN:
1) Set the “PAD”on “of f ”.
2) Set the
“Low cut ”on “of f ”.
3) Set the gain control
“Coar se”on "20".
4) Set the gain control
“Fi ne”on "0".
5)
Tur n al l “ Gai n”controls on the EQ fully CCW and the in/out switch on "Out ”.
6) Turn the “Thr eshol d”fully CCW and the “Comp”in/out switch on "Out".
7) Turn the “Out put gai n”fully CW.
8) Apply a signal of 1 kHz, -20,0 dBU to the mike input.
9) Adj ust t he pr eset “ Gai n”P2 (on amp/psu PCB) to an output reading of +10,0 dBU.