Boulder 1008 Specifications download pdf (Page 15)

CARTRIDGE LOADING – CAPACITIVE

The 1008 Phono Preamplifier inputs have only “parasitic” capaci-

tance of less than 50 pF directly across the cartridge inputs. If desired,

additional capacitance can be added on the personality card at C1. The

capacitor chosen should be 50 pF less than the desired value.

Solder holes are provided for two different size capacitors. There

are two pairs of holes as shown, two at left and two at right. Each pair

is connected together. The capacitor need be soldered to only one of

the left and one of the right holes.

All solder holes have grommets to reinforce the PC board when

parts are installed and removed. Do not remove these grommets.

BOULDER SUGGESTS: While there are some cartridge manufac-

turers who recommend using capacitive loading, we suggest that you

do not. Adding more capacitance only lowers the resonant frequency of

the capacitor and the cartridge winding inductance, particularly with

MM cartridges. The resonance peak is still just as high and destructive

to the sound.

Instead, try a lower resistor value; the lower the value, the “heavi-

er” the load and the lower the resonance peak (not frequency) thus giv-

ing better dampening to the cartridge.

With low level MC cartridges, there is virtually no effect of capaci-

tive loading because the cartridge output impedance is inherently very

low.

CARTRIDGE

SET UP

2-4

CONNECT CAPACITOR

FROM ONE LEFT HOLE

TO ONE RIGHT HOLE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 30 31

No comments

Boulder 1008 Specifications Page 15