D.A.S. D-100 - Appendix III: Using D-10 Amplifiers with 100 V;70 V Line Transformers; Frequency Response and Low Frequency Roll-off; Line Transformer Lead Outs

Manual del Usuario / D series amplifiers/ User’s Manual
15
APPENDIX III
INSTRUCTIONS FOR USING D-10 AMPLIFIERS WITH 100V/70V LINE TRANSFORMERS
Frequency response
It is necessary to provide some low frequency roll off to prevent the possibility of the line transformer
saturating.
On the D-10 the roll off is included on the main board as standard. To bring the 63 Hz roll off into circuit,
remove the 4 jumper links at 'hpf'.
The response must be at least -3dB at 70 Hz and roll off at minimum 12dB per octave.
LINE TRANSFORMER LEAD OUTS
500W single 100V winding:
Primary: Orange = +ve, Black = -ve (4 ohms)
Secondary: Yellow = +ve, Grey = -ve (100V)
Blue = centre tap, for monitoring purposes only
Note:
D-100 will give you 100V line out at the terminals.
D-20 will give you 70V line out at the terminals.