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Radial Bones Vienna

 Chorus User Guide v1.0-Nov. 2009 • Part #: R870 1229 00 • © 2009 All rights reserved • Subject to change without notice.

www.radialeng.com

Radial Engineering Ltd. • 1588 Kebet Way, Port Coquitlam, BC Canada V3C 5M5      
Tel: 604-942-1001 • Fax:  604-942-1010 • email: [email protected]

RADIAL LIMITED THREE YEAR TRANSFERABLE WARRANTY

Radial Engineering Ltd. warrants this product to be free from defects in material and workmanship and will remedy any such 
defects free of charge according to the terms of this warranty. Radial Engineering will repair or replace at its option any defec-
tive component(s) of this product, excluding the fi nish, the footswitch (tubes and footswitches are warranted for 90 days) and 
wear and tear from normal use, for a period of three (3) years from the original date of purchase. In the event that a particular 
product is no longer available, Radial Engineering reserves the right to replace the product with a similar product of equal or 
greater value. In the unlikely event that a defect is uncovered, please call 1-800-942-1001 or email [email protected] 
to obtain an RA number (Return Authorization number) before the 3 year warranty period expires. Once you have obtained 
an RA number you must return the product, freight prepaid, within fi fteen (15) days after the date the RA number is issued. 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 Engineering or to an authorized 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, 
misapplication, accident or as a result of service or modifi cation by any other than an authorized 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 WARRAN-
TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPEC-
TIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE YEARS. RADIAL ENGINEERING SHALL NOT BE RESPON-
SIBLE OR LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE 
USE OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER 
RIGHTS, WHICH MAY VARY DEPENDING ON WHERE YOU LIVE AND WHERE THE PRODUCT WAS PURCHASED.

FREQUENTLY ASKED QUESTIONS
Can I use any 9 volt adapter to power the Bones?

There are many adapters that can supply 9-12 volts DC but to be compatible the adapter must also have a 2.1mm barrel plug wired center pin negative. The Bones draw 

100mA of current to operate. Your adapter can be rated higher, for example 500mA, but not lower.  
I hear a high frequency “whine”. What causes this and how do I get rid of it?

Most likely this is caused by the power adapter you are using. Some switching type power adapters can make noise that bleeds into the guitar signal. If you encounter high 

frequency noise try a different adapter. We recommend standard linear adapters although we have successfully tested the Bones with both types.
Is the Vienna a true bypass pedal?

No. Bones pedals feature active buffering in bypass mode that lowers the output impedance allowing longer cables without noise or tone loss. This also enables us to 

employ EIS - Electronic Impulse Switching that eliminates certain problems with true bypass designs. True bypass switching can be noisy when switching pedals on and 

off producing pops and clicks. If used in conjunction with high-gain amps, that “pop” can become a loud “bang”. The EIS switch is 100% noiseless.
Which is better, True Bypass or Buffered Bypass?

Buffers are a good thing to have in your signal chain. They regulate your signal and lower the output impedance to drive long cables and dirty (oxidized) jack contacts. 

However, buffers have received a bad reputation because some manufacturers design their buffer circuits to save money. That design strategy limits overall sound quality 

of the bypassed signal and has created a demand for a better system. The simplest alternative was to do away with the buffer and provide a hard-wired bypass via a me-

chanical switch and the term “true bypass” was born. But this arrangement has a downside too. Mechanical switches can make noise and are less reliable than electronic 

switching. The Bones are designed with a great sounding class-A buffer that emulates the input impedance of a typical tube amp. With a well designed buffer you get less 

noise and great tone. 
Why can’t the Vienna be powered by a battery?

It’s because of the class-A topology. Class-A circuits sound best but are power hungry and will drain a battery in no time.
I use several pedals. Where’s the best place to put the Vienna in my signal chain?

There are no rules but there are general guidelines when it comes to modulation pedals like chorus. Placing distortion pedals like the Bones Hollywood before a chorus, 

fl anger or phaser will make their effects more prominent because of the increased harmonics the distortion adds. If you use time based effects like reverb or delay you 

can try placing the Vienna before them to produce “chorused” reverb and delay or after to “color” time based effect with chorus. Each method produces a slightly different 

outcome. Experiment and have fun.

DECLARATION 

OF CONFORMITY

Radial Engineering Ltd. declares that 
this product conforms to the following 
specifi cations:

Safety: IEC 60065 (1998), EMC: EN 
55013 (1990), EN 55020 (1991)

Supplementary information: The 
product herewith complies with the 
requirements of the Low Voltage Direc-
tive 72/23/EEC and the EMC Directive 
89/336/EEC as amended by Directive 
93/68/EEC.

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