B&K Phono10, Owner'S Manual

6 

IMPORTANT

 - 

ENSURE THAT THE POWER CORD IS DISCONNECTED FROM THE AC OUTLET PRIOR 

TO PERFORMING ANY OF THE FOLLOWING PROCEDURES! 

CAPACITIVE LOADING 

NOTE:

 The Phono 10 is shipped from the factory with no capacitor installed. Typically, the capacitance of the 

phono cables (

C

phono cables) is sufficient and no capacitor is needed. 

The capacitance (

C

load) should be: 

C

load = 

C

cartridge - 

C

phono cables - 

75

 pF 

1.

 Determine the capacitor value (pF) for proper loading of the MM cartridge in accordance with the 

specifications of the cartridge you have selected. The manufacturer of the cartridge may suggest a 
recommended value. The capacitive loading affects both the MM and MC stage. 

2.

 With the front of the unit facing you, locate the two gold plated pin receptacles with the label “CLOAD” 

between them. They are located near the back left of the circuit board. 

3.

 Trim the leads of the capacitors (one per channel) to approximately 3/8 inch. 

4.

 Insert the leads into the “CLOAD” pin receptacles securely. 

RESISTIVE LOADING 

NOTE:

 The Phono 10 is shipped from the factory with a 100K ohm resistor installed and the phono stage MM 

configuration selected (see “

Selecting Moving Magnet / Moving Coil

”). This resistor should not be removed 

unless the resistive loading is being changed in accordance with the following guidelines. 
 

1. 

Determine the resistor value for proper loading of the cartridge in accordance with the specifications of the 
cartridge you have selected. The manufacturer of the cartridge may suggest a recommended value. The 
resistive loading affects both the MM and MC stage. The factory installed resistors in the Phono 10 will match 
most phono cartridges on the market. 

IMPORTANT 

- ENSURE THAT THE POWER CORD IS DISCONNECTED FROM THE AC OUTLET PRIOR 

TO PERFORMING ANY OF THE FOLLOWING PROCEDURES!

A.

 The resistive loading for the MM stage can be calculated using the following equation: 

R

i (in Kohms) = (100,000 * 

R

c) / (100,000 - 

R

c) 

Where: 

R

i = inserted resistor value 

R

c = cartridge loading value (must not exceed 100 Kohms) 

**1 Kohms = 1,000 ohms ** 

For example: 

R

c (desired) = 50 Kohms 

R

i = (100,000 * 

R

c) / (100,000 - 

R

c) 

R

i = (100,000 * 50,000) / (100,000 - 50,000) 

R

i = 100 Kohms (factory installed) 

Refer to 

(Table 1)

 for more examples. 

 
B.

 The resistive loading for the MC stage can be calculated using the following equation: 

R

i (in ohms) = (133 * 

R

c) / (133 - 

R

c) 

Where: 

R

i = inserted resistor value 

R

c = cartridge loading value (must not exceed 133 ohms) 

For 

R

i >> 1300, 

R

c = 133 ohms 

For example: 

R

c (desired) = 100 ohms 

R

i = (133 * 100) / (133 - 100) 

R

i = 403 ohms (use 402 ohm standard value resistor) 

Refer to 

(Table 1)

 for more examples.