Capacitive Loading; Resistive Loading - B&K Phono10 Owner's Manual

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Table Of Contents

Table of Contents

IMPORTANT

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

TO PERFORMING ANY OF THE FOLLOWING PROCEDURES!

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

phono cables (Cphono cables) is sufficient and no capacitor is needed.

The capacitance (Cload) should be:

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.

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:

Ri (in Kohms) = (100,000 * Rc) / (100,000 - Rc)

Where: Ri = inserted resistor value

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

**1 Kohms = 1,000 ohms **

For example:

Rc (desired) = 50 Kohms

Ri = (100,000 * Rc) / (100,000 - Rc)

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

Ri = 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:

Ri (in ohms) = (133 * Rc) / (133 - Rc)

Where: Ri = inserted resistor value

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

For Ri >> 1300, Rc = 133 ohms

For example:

Rc (desired) = 100 ohms

Ri = (133 * 100) / (133 - 100)

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

Refer to (Table 1) for more examples.