Radial Engineering Tonebone Manuel du propriétaire télécharger pdf (Page 10)

True to the Music

Radial Engineering Headbone Owner’s Manual

To best explain the workings of the Headbone, take a minute to study

the block diagram. Reading from left to right, you can see the inputs, the

high-impedance guitar switching, the control circuitry and the speaker

level switching.

The Input Signal Path

The Radial Headbone’s input signal path is 100% discreet Class-A.

This means that it employs a whole bunch of parts such as resistors and

capacitors instead of a transistor to buffer (amplify) the guitar signal to a

manageable level. Class-A circuits are preferred over integrated circuits

(IC chips) as they are more natural sounding.

Buffered and Direct Inputs

The Headbone gives you the choice of two inputs: one buffered and one

direct or unbuffered. The reason we do this is that when you are driving

a pre-buffered signal, there is no advantage to buffering the signal again.

In some cases, two buffers in series could add distortion or noise.

If you are connecting the guitar directly to the Headbone, use the Buff-

ered Input. If you use a buffering device (pre-amp), such as the Radial

Loopbone or Switchbone, you would plug the output of the device into

the unbuffered Direct Input. Some effect pedals use a buffering stage

in their design, some do not. If you are connecting an effect pedal before

the Headbone, the best way to decide which input to use is to let your

ears choose the one that sounds best to you.

Switching Guitar Signals

To make the Headbone work, it cannot simply switch the ampliﬁer’s

speaker outputs. The inputs to the amp must be switched as well. It is

important that the input going to the unused head be turned off so that

while on standby, it is not trying to amplify a signal with nowhere to go.

The Headbone simultaneously switches the amp’s inputs and outputs.

Actual head switching is performed by a series of opto-couplers, which

are made to ramp-up and ramp-down the guitar signal in such a way as

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Radial Engineering Tonebone Manuel du propriétaire Page 10