DYNACO PAT-4 Посібник з монтажу - Сторінка 18

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Gain Trim Resistors

A gain trim resistor is a bit of a two-edged sword. The 1210 Ohm value is about the

lowest value that should be used. It reduces the gain, but it also increases the loading on

the output stage. The net effect is positive...if indeed you needed less gain, then the 1210

resistor drops the gain, increasing the SNR for the high level stage.

Here is a table of other values for the gain trim resistors, and their effect on the flat gain

of the high level stage.

Gain Trim Resistor Value

Open circuit

22K

10K

6800

3300

2200

1210 or 1200 Ohms

The unmodified high level stage has about 21 dB of gain when driving a high impedance

load and the volume control is turned fully clockwise.

Figure 7-Tone control switch installed and wired to bass control, treble control and PCB's (green

wires called out in the assembly directions are blue in the pictures above).

Gain Reduction

0 dB (e.g. no effect)

1.53 dB

3.02 dB

4.08 dB

6.7 dB

8.46 dB

11.23 dB

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