Radian Technologies Headphones VT R800 7040 00 User Guide

Radial  
Headbone VT & SS  
Part # VT R800 7040 00  
SS R800 7084 00  
Owner’s Manual  
Radial Engineering  
1638 Kebet Way, Port Coquitlam BC V3C 5W9  
tel: 604-942-1001 • fax: 604-942-1010  
Radial Engineering is a division of C • TEC (JP CableTek Electronics Ltd.)  
 
True to the Music  
RADIAL HEADBONEOWNER’S MANUAL  
Table Of Contents  
Page  
Caution Statement & Legal Disclaimer..............................Inside cover  
Introduction................................................................................1  
Feature Set................................................................................3  
Quick Start.................................................................................5  
Getting To Know Your Headbone ..............................................7  
FAQ ...........................................................................................11  
Warranty............................................................................Back cover  
Congratulations on your purchase of a Radial Headbone!  
As part of the growing family of Tonebone products, the Headbone is de-  
signed to open doors to creative new sounds and provides the discerning  
guitarist with greater options on stage and in the studio with a simple, yet  
extremely versatile interface.  
The Headbone is designed to connect two amplifier heads to one speaker  
cabinet and switch between amplifiers with a footswitch. The Headbone  
uses pure Class-A electronics under digital control for the hi-impedance  
guitar signals and hi-power speaker signals. Add Slingshot™ remote  
control and you get a true marvel whose time has come! Best of all, the  
Headbone is engineered to ensure the safe operation of either tube (VT)  
or transistor (SS) amps.  
To take advantage of all of the wonderful features that have been in-  
corporated into the Headbone, please take the time to read through  
this manual before you use it. This will give you a broader sense of the  
Headbone’s capabilities and ensure its safe and proper operation. If you  
have questions that are not covered here, please visit the FAQ section  
on our web site. This is where we post answers from questions that come  
from users. If you have a question that is not covered there, please feel  
free to send us an email at [email protected] and we will do our very  
best to respond as quickly as possible.  
Start your engines!  
Radial Engineering is a division of JP CableTek Electronics Ltd.  
Radial Headbone Owner’s Manual - Part # R800 9680 00 • V1.0 06-20-04  
Specifications and appearance are subject to change without notice.  
Radial Engineering  
Headbone Owner’s Manual  
 
True to the Music  
INTRODUCTION  
Whether you have a Headbone VT or a Headbone SS, the  
setups and connections are identical. For simplicity, this  
manual will discuss the Headbone VT. It is important to note  
that because of the very different nature of solid-state amps  
and valve-tube amps, each Headbone’s internal circuit is  
different. The Headbone VT is exclusively designed for  
valve-tube amps; the Headbone SS is exclusively designed  
for solid-state amps. As such the SS and VT are not inter-  
changeable. Attempting to use a solid-state amp with the  
Headbone VT (or vice versa) could damage your amp and/or  
the Headbone. This would void your warranty. Please consult  
your dealer and make sure you fully understand the owner-  
ship disclaimer before using the Headbone.  
When developing the Headbone, we asked guitarists: “What would be  
the ultimate guitar setup?” Ask 10 guitarists this question and you will  
likely get 10 different answers. The reason for this is simple: There are  
no right answers as the possibilities are endless. So where do you start?  
You need a concept. The following is a setup concept that will help get  
those creative juices flowing. It combines simplicity with awesome stage  
performance.  
The guitar connects to the effects on the pedalboard. The pedalboard is  
connected to the Headbone input. The Headbone connects to the inputs  
of the two amplifier heads. The amplifer outputs are brought back to the  
Headbone which, in turn, connects to the speaker cabinet. In the example  
below, amp head-1 is a 100-Watt 2-channel amp with one channel set to  
clean and the other set to saturated overdrive distortion. Amp head-2 is  
a low power 30-Watt amp that would be driven ‘hard’ for natural output  
tube overdrive.Add a good distortion pedal and all of a sudden your setup  
becomes a tone monster.  
Typical Headbone setup with a channel  
switching head and a single channel head.  
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Why is this setup so cool? Because it truly covers all of the bases: the  
powerful clean sound from a 100-Watt amp is radically different than an  
all-tube 30-Watt amp cranked to 10. Not just as far as loudness goes,  
but also as far as tone. Being able to use that reserve power for blister-  
ing solos can make a huge difference. Best of all, you only have to carry  
around a single speaker cabinet - a luxury that is best appreciated at two  
in the morning after the gig!  
OVER-  
DRIVE  
PED-  
AL  
HEAD-1 HEAD-1 HEAD-2  
CLEAN CRUNCH OVER-  
TYPE OF SOUND  
CH. 1  
DRIVE  
CH. 2  
Tone-1  
Tone-2  
Tone-3  
Tone-4  
Tone-5  
Tone-6  
Clean Rhythm  
X
X
Solo Distortion  
X
X
Crunch Rhythm (change amp ch.)  
Saturated Solo  
X
X
Overdrive Rhythm (change heads)  
Saturated Rhythm  
X
X
Tone chart: two amp heads, one distortion pedal, one speaker cabinet,  
six distinct amp tones.  
This is the point: with the Headbone in your rig, you are now able to specify  
which amplifier you will use for a particular song or passage. You do not  
have to compromise.And you do not have to carry around two amp-stacks  
to get there. Yes, finally a device that adds tonal flexibility while reducing  
the amount of equipment you bring to the gig!  
AMP HEAD-2  
AMP HEAD-1  
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FEATURE SET  
1. Input Buffered – This is the primary input for your guitar and pedal  
effects that do not buffer (pre-amplify) the signal.  
2. Input Direct – Used when driving the Headbone from a device, like  
the Radial Loopbone, that buffers (pre-amplifies) the signal.  
3. To Amp-1 Input – This is a ¼” hi-impedance guitar signal output that  
connects from the Headbone to the input of the first guitar amplifier.  
4. To Amp-2 Input – This is a ¼” hi-impedance guitar signal output  
that connects from the Headbone to the input of the second guitar  
amplifier.  
5. Ground Lift – This recessed switch connects the ground toAmp-2. This  
switch is factory set in a ‘lifted’ position to eliminate ground loops.  
6. Slingshot Remote Input – This ¼” input is used to remotely control the  
Headbone from your pedalboard using a standard contact closure foot-  
switch or another Tonebone device that features a Slingshot output.  
7. From Amp-1 Output – Connects from the first amplifier’s speaker  
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Headbone Owner’s Manual  
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True to the Music  
output jack back to the Headbone. This is a speaker level signal, so  
use a good quality speaker cable for best power transfer.  
8. From Amp-2 Output – Connects from the second amplifier’s speaker  
output jack back to the Headbone.  
9. To Speaker Cabinet – Connects the Headbone to your speaker  
cabinet.  
10. Power Supply Connection – The Headbone comes with its own  
15VDC power supply in a choice of 100V, 110V, 220V and 240V  
models.  
11. Footswitch – Used to toggle the Headbone between Amp-1 and  
Amp-2  
12. LED Indicators – Indicates which amplifier head is active.  
QUICK START  
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Headbone Owner’s Manual  
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True to the Music  
Before making any connections, ensure that your ampli-  
fiers are turned off, the Headbone power supply is discon-  
nected, and volume controls are set to zero.  
1. Begin by connecting your guitar to the Headbone’s ¼” Buffered Input.  
This will allow you to test the system more effectively during the initial  
setup. For unbuffered (Direct) input use, please go to the section that  
discusses this on page 7.  
2. From the Headbone, connect the To Amp-1 Input jack to your first  
amp’s guitar input. This circuit connects the guitar to your first ampli-  
fier. Always use good quality shielded cable to ensure low noise and  
best performance.  
3. From the Headbone, connect the To Amp-2 Input jack to your second  
amp’s guitar input. This circuit connects the guitar to your second  
amplifier when the footswitch is toggled.  
You are now ready to connect the speaker jacks.  
At this time, you should check to make sure both  
amplifiers have their impedance set to match the  
speaker cabinet impedance. If you are unsure about  
this, consult a qualified technician. Always use good  
quality speaker cables to ensure the best possible  
power transfer.  
4. From your first amp’s speaker output, connect to the Headbone’s  
From Amp-1 Output jack. This brings the signal from amp-1 back to  
the Headbone.  
5. From your second amp’s speaker output, connect to the Headbone’s  
From Amp-2 Output jack. This brings the signal from amp-2 back to  
the Headbone.  
6. From the Headbone’s To Speaker Cabinet jack, connect to your  
speaker cabinet. You are now ready to start system tests.  
7. Connect the Headbone’s power supply. The Headbone will turn on and  
you will see one of the LEDs illuminate.  
8. You can now turn on your guitar amplifiers. It is a good practice to  
test equipment setups at a low volume to reduce any possibility for  
system damage should there be an improper connection. Turn up  
the volume slowly while listening for excessive noise. Depress the  
footswitch to make sure both amps are working. If all is well, you are  
ready to crank it up!  
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Headbone Owner’s Manual  
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QUICK START CONNECTIONS  
1
2
3
4
5
6
7
Signal from guitar or pedalboard.  
Guitar signal to amp head-1.  
Guitar signal to amp head-2.  
Speaker signal from amp head-1.  
Speaker signal from amp head-2.  
Speaker signal to speaker cabinet.  
Power supply  
Throughout this manual, references are made to “guitar level  
signals” and “speaker level signals”. The Headbone passes  
both types and it is important to use the proper cables.  
A guitar level signal requires a good quality shielded cable to  
work well. You will find that using high quality guitar cables  
with proper shielding will help reduce system noise and radio  
interference.  
Speaker level signals require good quality unshielded  
speaker cables. We recommend using a minimum of 14AWG  
cables for speaker cable runs under 8 feet. Larger gauge  
cables should be used for longer runs. Never use shielded  
guitar cables for speaker connections. A Headbone cable kit  
is available from Radial Engineering. Ask your dealer.  
GETTING TO KNOW YOUR HEADBONE  
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Headbone Owner’s Manual  
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True to the Music  
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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Headbone Owner’s Manual  
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True to the Music  
to avoid any clicks or pops. The PIC digital controller controls this action  
(see block diagram on page 7).  
Switching Speaker Signals  
To accomplish this task, the PIC sends a status change command to a  
series of internal relays that connect the speaker to the active amp, and  
connect the load resistor to the standby amp. Always use good quality,  
large conductor speaker cable between the Headbone, your amps and  
your speaker cabinet, as this will reduce signal loss and improve the  
transient response. Your Headbone has been designed to work with  
amps whose maximum output is 100-watts RMS. The power is limited  
by the relay that is used to switch the speaker signals. To be safe, never  
exceed this power limit.  
Effects such as echo or loop-playing devices, MUST BE  
CONNECTED BEFORE the Headbone so that their residual  
or sustaining sound can be disconnected from the input of  
the amplifiers. This means that you cannot use any type of  
echo device that prolongs a signal on the amplifier’s effects  
loop or after the Headbone in your signal chain. Failure to  
do so could cause the echo to continue to play through the  
standby amp which, in turn, would continue to amplify the  
signal without a load. This could cause the amp or the Head-  
bone to malfunction. The Headbone’s internal resistor load  
is only designed to support the standby amplifiers residual  
output. The Headbone is NOT a load box.  
Matching the Speaker Load  
The Headbone itself has no effect on amplifier load or speaker imped-  
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Headbone Owner’s Manual  
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ance. You must manage the speaker connections for the best impedance  
match. It is important to note that most amplifiers are designed to work  
best at their rated impedance. If your amp features selectable impedance  
loads, use the one that matches your speaker cabinet.Always consult the  
amplifier’s specifications to ensure the speaker connections are within  
the amplifier’s accepted working range.  
While matched loads between the amplifier and speaker are the ideal,  
unmatched loads can be used. The guidelines below will explain the  
ramifications of using unmatched loads.  
Using Unmatched Speaker Loads With Tube Amps  
Driving a speaker load that is lower than the amps output impedance  
(8-Ohm amp with 4-Ohm speaker) tends to drive the tubes harder, which  
means they will not last as long. On the other hand, a higher speaker  
impedance load (4-Ohm amp with 8-Ohm speaker) will generally sound  
less full and less punchy, but tube life is extended.  
Using Unmatched Speaker Loads With Solid State Amps  
Transistor or solid-state amps work differently than tube amplifiers. With  
solid-state amps, lowering the speaker impedance load generally makes  
the amp sound louder with little change in tone. Most solid-state amps are  
designed to see an 8-Ohm or 4-Ohm load. Never go below the rated  
minimum impedance for transistor amplifiers.  
Grounding for Safety!  
The Headbone is powered by an external power supply with a floating  
Amp type  
Higher speaker impedance Lower speaker impedance  
Rated impedance  
Connecting a 16-Ohm cabi- Connecting a 4-Ohm cabinet  
Tube amp  
net will make amps sound  
will make amps sound more  
8-Ohm  
less punchy & warm. You get punchy and warm. You get  
longer tube life.  
shorter tube life.  
Solid-state  
amp  
Connecting a 16-Ohm  
cabinet will reduce the power will increase the volume.  
Connecting a 4-Ohm cabinet  
8-Ohm  
and lower the volume.  
Check amp specification for  
minimum load.  
ground. This means that the guitar derives it’s ground thru the amplifier  
connected to the Headbone’s To Amp-1 Input jack.  
The ToAmp-2 Input jack is transformer-isolated from ground to eliminate  
hum or buzz caused by so-called ground loops passing between amp-1  
and amp-2. Arecessed ground-lift switch is provided to bypass the trans-  
former and reconnect the ground through amp-2. The switch is factory  
set in the lifted position Should the amplifier connected to the To Amp-1  
Input jack not be properly grounded, this switch may be depressed to  
connect the ground path through amp-2.  
For safety, always use properly grounded guitar amps with 3-prong electri-  
calAC plugs. The third prong is a safety ground that is there to protect you  
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Headbone Owner’s Manual  
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from electrical shock. Most amplifiers have been subjected to safety tests  
from authorities like UL or CSA. Amplifiers that have passed these tests  
are safe to use with your Headbone. If you intend to use the Headbone  
with amps that only have 2-prong AC plugs, such as old vintage amps,  
you are doing so at your own risk. Please consult a qualified technician  
if you are not sure how to establish a safety ground connection.  
Safe Mode™ Operation  
One of the really smart features in the Headbone is a function called Safe-  
Mode. Should the Headbone’s DC power supply be disconnected, the  
system will ‘default’ to Safe Mode, wherebyAMP-1’s input and output will  
automatically connect to the speaker cabinet. This simple, yet extremely  
important safety feature, will ensure that the active guitar amp always  
“sees” a load and that the standby amp is muted.  
Slingshot Remote  
The Slingshot feature allows you to position the Headbone adjacent to  
the guitar amplifier setup and remotely control it from a distant footswitch.  
With Slingshot you can avoid a mess of spaghetti by keeping the cables  
between the Headbone, amps, and speaker short. This also improves  
amplifier efficiency and reduces system noise.  
The Headbone’s Slingshot Remote is a simple contact closure that al-  
lows a standard ‘latching’ footswitch to remotely toggle the Headbone’s  
status from amp-1 to amp-2. Most standard ¼” mono-style footswitches  
will work. The Headbone may also be used with Slingshot equipped  
pedals such as the Radial Loopbone. Other pedal-switching devices or  
MIDI controllers that are equipped with a contact closure output will also  
be able to toggle the Headbone.  
Remote Footswitch Schematic  
Use this drawing for making your own remote footswitch.  
Use a SPST push-on/push-off type footswitch. If you wish, an optional  
LED can be included in the circuit. Any standard size ( T-1 or T-1 3/4 )  
red LED with forward voltage between 1.6 & 2.2 volts (current = 20ma)  
will work. The LED will light when AMP-2 is active. Connect the switch  
to the Slingshot Remote input on the Headbone with a two conductor  
cable. Connecting a remote footswitch to the Headbone will disable the  
onboard footswitch. If you are unsure of these requirements, please refer  
to a qualified electronic technician.  
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Headbone Owner’s Manual  
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FAQ  
Q: I heard that tube amps must always see a speaker load or else  
they will blow up. Is this true?  
A: This is true. To deal with this, the Headbone is equipped to manage  
two loads: the speaker for the active amp and a load resistor for the  
standby amp. The Headbone transitions between these two loads  
when the footswitch is toggled.  
Q: Is the Headbone a load-box?  
A: No. A load-box is designed to absorb an amplifiers full output and  
pass a reduced amount of power to the speaker. The Headbone uses  
a much smaller load resistor to provide an idle load for the standby  
amplifier.  
Q: Why does the Headbone use opto-couplers and relays to  
switch the guitar and amp signals?  
A: To switch active signals a circuit designer must choose between  
voltage controlled amplifiers (VCA’s), opto-couplers, relays, or convert-  
ing the signal to digital and then back to the analogue domain. The  
type of guitarist that uses a Radial product is generally a purist and is  
very concerned about retaining the natural tone of his instrument. VCA  
and digital circuits are not acceptable as they change the tone of the  
instrument. Tonebone products use opto-couplers on the hi-impedance  
circuits to eliminate all switching noise and relays on the speaker level  
signals where high voltage is present.  
Q: I have heard that using an echo with a head switcher can cause  
a problem with the amps. Is this true?  
A: It depends on where the delay is positioned in the signal chain. If the  
delay is placed before the Headbone, there is no problem. If the delay  
device is placed after the Headbone, or in an amplifier’s effects loop,  
you can have a problem because the echo may continue to generate  
a signal and send it through the “stand-by” amp with no speaker load  
connected. It is generally not good to run an amp this way as the out-  
put transformer can heat up and ultimately short out. Thus, always put  
delay and looping devices before the Headbone in the signal chain.  
Q: Can I use the Headbone like an A/B box?  
A: It certainly could be done, but you may encounter ground loop  
problems as the Headbone is not set up for this function. The Radial  
Switchbone would definitely be a better choice.  
Q: Can I use the Headbone with a MIDI switcher?  
A: Yes. Most MIDI switchers are equipped with a contact closure output  
jack. This would be connected to the Headbone’s Slingshot input to  
remotely control amp switching.  
Q: If I do not want to use the Slingshot remote, how far from the  
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Headbone Owner’s Manual  
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amps and speaker can I be?  
A: As a general rule, we do not recommend running cables any more  
than 20 feet as you are subjecting the signal to increased resistance. If  
you are intent on doing so, use good quality cables. For speaker con-  
nections use large gauge (12AWG) speaker cables. For guitar signals  
use low capacitance shielded cables.  
Q: How do I know if my footswitch will be Slingshot compatible?  
A: If your external footswitch employs a basic latching type switch with  
a ¼” or ¼” TRS connector it will, in all likelihood, be compatible. If it  
employs some type of multi-pin connector or telephone style jack, it may  
not. Consult your dealer or manufacturer for advice on how you can make  
an adaptor that will allow you to enjoy the benefits of the Headbone’s  
Slingshot.  
Q: Can I use another power supply other than the 15VDC that comes  
with the Headbone?  
A: No. Never use another power supply unit other than the one included  
with your Headbone. Because of the Headbone’s Class-A circuit, a more  
powerful 15VDC supply is required. If you need a replacement power  
supply, contact your Tonebone dealer.  
Q: If I have a 300-Watt amp, can I modify the Headbone?  
A: Yes. In fact we have included a provision in the design to allow a  
350-Watt relay to be factory installed in the Headbone. Simply contact  
your Tonebone dealer for details on how you can order this special  
high power version.  
Q: I have two amp heads; one tube head and one solid state. Do I  
use the VT or the SS?  
A: Unfortunately the world of tubes cannot collide with the world of  
transistors due to the way that the amps are designed. We are, how-  
ever, working on the Headbone TS (tube & solid state) that will allow  
you to do this. Until then, you would have to use a product like the  
Tonebone Switchbone and carry two speaker cabinets.  
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Headbone Owner’s Manual  
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RADIAL LIMITED ONE YEAR WARRANTY  
Radial Engineering - a division of JP CableTek Electronics Ltd. (“Radial”)  
warrants this product to be free from defects in material and workmanship to  
the original owner and will remedy any such defects free of charge according  
to the terms of this warranty. Radial will repair or replace at its option any  
defective component(s) of this product, excluding the finish, wear and tear  
on components under normal use, and the tube and footswitch (which are  
warranted for 90 days), for a period of one (1) year from the original date of  
purchase. In the event that a particular product is no longer available, Ra-  
dial reserves the right to replace the product with a similar product of equal  
or greater value. To make a request or claim under this limited warranty,  
the product must be returned prepaid in the original shipping container (or  
equivalent) to Radial or to an authorized Radial repair centre and you must  
assume the risk of loss or damage. A copy of the original invoice showing  
date of purchase and the dealer name must accompany any request for work  
to be performed under this limited warranty. This limited warranty shall not  
apply if the product has been damaged due to abuse, misuse, misapplica-  
tion, accident or as a result of service or modification by any other than an  
authorized Radial repair centre.  
THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE  
ON THE FACE HEREOF AND DESCRIBED ABOVE. NO WARRANTIES,  
WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO,  
ANY IMPLIED WARRANTIES OR MERCHANTABILITY OR FITNESS FOR  
A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE  
WARRANTY PERIOD DESCRIBED ABOVE OF ONE YEAR.  
RADIALSHALLNOT BE RESPONSIBLE OR LIABLE FORANY SPECIALOR  
INCIDENTAL OR CONSEQUENTIAL DAMAGES OF LOSSARISING FROM  
THE USE OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC  
LEGALRIGHTS,AND YOU MAYALSO HAVE OTHER RIGHTS, WHICH MAY  
VARY FROM STATE/PROVINCE TO STATE/PROVINCE.  
Radial Engineering  
1638 Kebet Way, Port Coquitlam, BC V3C 5W9  
tel: 604-942-1001 • fax: 604-942-1010  
web:  
Radial Engineering is a division of JP CableTek Electronics Ltd.  
Radial Headbone Owner’s Manual - Part # R800 9680 00 • V1.0 06-  
20-04  
Specifications and appearance are subject to change without notice.  
 

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