*See engineers notes at rear
Page 3
ST845 Layout and Features
Page 1: ...ould you be uncertain about anything please contact your dealer or one of our team Valve amplifiers do need a little more attention than their solid state counterparts but the sonic improvements are w...
Page 2: ...wiring check Bias meter calibration ma Run min 12 hour test Check input Output Valve Bias level v Sound Quality Channel Balance Valve Microphony Valve Seating Hum level L R mv RF Test LED brightness S...
Page 3: ...See engineers notes at rear Page 3 ST845 Layout and Features...
Page 4: ...o Live terminal Blue to Neutral terminal and Green Yellow to Earth terminal 6 SWITCH ON The meter should light up and the 845 heaters should glow bright yellow You will may hear a humming noise for a...
Page 5: ...nnects You can either hard wire your cable to the amplifier by baring enough cable to fit in the connector and twist together to avoid any spare strands touching anywhere else soldering the stands tog...
Page 6: ...wait 20 minutes before removing bottom plate If the HT fuse has blown there are replacements inside Replace bottom cover afterwards and check bias immediately after switching on If the replacement fu...
Page 7: ...tor the pointer should be in or close to the black section If not adjust until it is correct The adjustment is very sensitive so adjust very carefully Then select V2 and adjust if necessary Do the sam...
Page 8: ...w the reading goes this will not cause damage Do final adjustment when the amplifier is fully warmed up If all is well there should be no more than a barely detectable hum from the speakers and the am...
Page 9: ...ox any subsequent claim is unlikely to paid This amplifier is designed for normal domestic hi fi use It is not guaranteed for commercial Public Address use or use in other situations The guarantee bec...
Page 10: ...s attached to the base If the fuse blows again a VARIAC will be useful to operate the amplifier on reduced voltage in order the trace the fault or overload Make sure the bias for the 845s is correct I...
