H. H. MORCH DP-8 Instructions Manual Download Page 6

Page 6

 

Take off the armtube. The accompanying syringe contains about 0.6 ml of silicone fluid. Pull the black 
piston out of the lifter cylinder and place it in a completely clean place. Then inject 0.05 ml 

but 

absolutely no more than 0.1 ml

 of the fluid 

behind

 the lifter handle shaft inside the lifter cylinder. 

When doing this the lifter handle must be in "lowered" position (Fig. 8). 
 
When the fluid is injected, the tip of the syringe is "wiped off" on the shaft, and the syringe is pulled up 
with a little jerk thereby preventing the fluid from getting in touch with the walls of the lifter cylinder. Do 
not put the piston back into the lifter cylinder until the silicone fluid has merged down to the bottom of 
the cylinder, and hereafter the piston must 

not

 be pulled up again, as the silicone fluid would then 

easily stick to the walls of the lifter cylinder. If this happens the piston will descend much too slowly. 
 
The silicone fluid can also be used for damping the vertical mode of motion, 

something that is rarely

 

an advantage.

 If desired anyway, please request from your supplier a separate document describing 

the procedure. 
 
 

Mounting the cartridge 

Fig. 10. A cartridge mounted by using the finger lever and screws. 

 
Using the accompanying finger lever the cartridge can now be mounted on the armtube (Fig. 10). If 
possible, use the accompanying aluminum screws. Provided that the tonearm is mounted, so that the 
distance from the pivot to the center of the turntable is as indicated in Fig. 1, the position of the stylus 
- to obtain correct overhang - should be: with standard armtubes right under the front edge of the 
black plane of the armtube - with 

PRECISION armtubes 4 mm (5/32”) behind the front edge. Also the 

cartridge should be in parallel to the said black plane. Carefully push the terminal jacks of the wires 
unto the pins of the cartridge with a pair of tweezers. Do not force them too much and

 also see that 

you are not squeezing the thin wiring too hard

. Red and green are signal and ground of the right 

channel. White and blue are signal and ground of the left channel. 
 
The flange of the armtube having 5 contact pins now is pushed down on the threaded rod on top of 
the arm base. It is fastened with the accompanying knurled not, which should be tightened well with 
two fingers. Check that the overhang is correct - 

18 mm (23/32”) for 9” armtubes - and adjust if 

necessary. The easiest way to check that the overhang is correct is to put a ruler on the turntable 
platter, so that one of its sides touches the turntable spindle. Then turn the turntable platter, so that 
the said side of the ruler points to the center of the knurled nut on top of the armtube. Then the 
armtube is moved so that the stylus is brought on line (above the said side of the ruler) with the 
direction from the center of the turntable spindle to the center of the said knurled nut. The distance 
from the center of the turntable spindle to the stylus (overhang) can be accurately observed by looking 
at the scale of the ruler between the stylus and the turntable spindle. Look at right angles to the ruler. 
Of course an alignment protractor will help to align more accurately. 
 
  

Adjusting the tonearm 

 
Using the VTA, adjust the height of the arm base so that the antiskating spring is at level with the 
record. 
 

Summary of Contents for DP-8

Page 1: ...e Armtube Combination List under Instructions in our website There also will be 4 weights with O rings 4 weights with screws finger lever with screws knurled nut hexagon spanner syringe with silicone...

Page 2: ...at the armtube can rest in the arm rest in a suitable distance from the turntable platter Move the armtube resting on the girder of the raised pick up lifter all the way to the end of the girder Then...

Page 3: ...tly The width of the thick paper is the same as the distance from the smaller weight to the heavy body where the side rod is attached Fig 3 Tighten the screw of the smaller weight with the paper as a...

Page 4: ...Fig 6 All the side weights mounted shown with the paper as spacer between two of them and the hexagon key in one of them Coarse adjustment of lateral balance Raise the pick up lifter Using the supplie...

Page 5: ...on the weight of the cartridge With the lighter armtubes the small counterweight and the tracking force weight is put onto the counterweight rod With the heaviest armtube blue the large counterweight...

Page 6: ...verhang should be with standard armtubes right under the front edge of the black plane of the armtube with PRECISION armtubes 4 mm 5 32 behind the front edge Also the cartridge should be in parallel t...

Page 7: ...t is used move another counterweight and or the tracking force weight If there is not enough space to move the weights forwards to give the correct tracking force a counterweight should be replaced by...

Page 8: ...rned a little up Also the heavy end of the big side weights could be turned a little more up After adjusting any of the weights except the tracking force weight the lateral balance should be adjusted...

Page 9: ...ter clockwise as possible Usually for fine adjustment it will be enough to turn the heavy end of any counterweight on the counterweight rod in the direction of where the side weights are coming up fir...

Page 10: ...or less antiskating than before Please note that the stability of the horizontal mode of motion is obtained as a co function between the heavy sideweights and the excessive damping in the horizontal p...

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