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PowerTube™ Preamp

True to the Music

®

Radial Engineering Ltd.

Radial  PowerTube

500 Series Tube Preamp

®

Table of Contents 

Page

Overview.......................................................................................................................1

Features .......................................................................................................................2

Making Connections .....................................................................................................3

Getting Started .............................................................................................................4

Filters ............................................................................................................................5

Hidden Switches ...........................................................................................................6

Ominiport ......................................................................................................................7

Specifi cations ...............................................................................................................8

Block Diagram ..............................................................................................................8

Radial Limited Warranty ................................................................................Back Cover 

Thank you for investing in a Radial PowerTube

 microphone amplifi er. We are very excited 

about this product and are confi dent that once you get it hooked up, the excitement will be 
contagious!  So get ready to enjoy one of the best sounding tube preamps ever made! 

Before you start revving up this vacuum tube wonder, we kindly ask that you take a few 
moments to read this manual and familiarize yourself with the many features that are built in. 
For instance... did you know that there is a miniature switch inside that that enables you to 
safely connect up to eight PowerTubes in a Workhorse without overtaxing the power supply? 
How about the hidden ground lift switch that can accidentally turn phantom power off? This 
is important stuff and well worth reading! 

Then, after you are done, you will likely have some questions. To address these, we invite 
you to visit the PowerTube FAQ page on our web site. This is where we post the latest news 
and of course questions from users. If you do not fi nd the answers you need, we invite you to 
send an email to [email protected] and we will do our very best to reply promptly. 

Now get ready to tear up the airwaves with the sound of high voltage tube magic. 

Summary of Contents for PowerTube 500 Series

Page 1: ...g com True to the Music User Guide www radialeng com Radial Engineering Ltd 1588 Kebet Way Port Coquitlam British Columbia Canada V3C 5M5 tel 604 942 1001 fax 604 942 1010 email info radialeng com Pow...

Page 2: ...Workhorse or other 500 series rack is powered on Hot swapping can cause connection sparks at the card edge connector that could send damaging transients to other equipment This also greatly reduces t...

Page 3: ...oments to read this manual and familiarize yourself with the many features that are built in For instance did you know that there is a miniature switch inside that that enables you to safely connect u...

Page 4: ...common functions such as a mic input trim control gain control and 48 volt phantom power Some of the extras that are not so common include a 10 bar LED VU meter polarity reverse switch a high pass fi...

Page 5: ...y useful when layering acoustic instruments 7 48V Phantom power for condenser microphones is equipped with power on LED and recessed switch to prevent accidental use that could damage ribbon microphon...

Page 6: ...standard 3 pin XLR cable You can use either the front or rear panel XLR as the input both are wired in parallel The PowerTube follows the AES standard with pin 1 ground and pin 2 hot Most devices are...

Page 7: ...sure the 180 is off switch outward 3 Gain control should be off fully counter clockwise 4 HPF should be turned off switch outward 5 AIR should be turned off switch outward Plug in your microphone If y...

Page 8: ...500 1k 2k 5k 10k Hz AIR Filter Response HPF FILTER A high pass filter low cut is generally used in the studio to clean up excessive bottom end that can render recordings muddy and cause some instrumen...

Page 9: ...Power Assign switch comes factory set in the up 16V position The switch position is not critical when only one PowerTube is being used When using multiple PowerTubes simply toggle the switches with on...

Page 10: ...e will automatically revert to normal mic mode Changing the tube Inside the PowerTube is a 12AX7 tube This is mounted on a separate circuit board so that it can fit within the limited space afforded i...

Page 11: ...THD N 0 03 Intermodulation Distortion IMD 0 012 Instrument Input Omniport Input Impedance 150k Ohms unbalanced Instrument Preamp Gain 55dB Equivalent Input Noise EIN 95dBu Total Harmonic Distortion TH...

Page 12: ...ny any request for work to be performed under this limited and transferable warranty This warranty shall not apply if the product has been damaged due to abuse misuse misapplication accident or as a r...

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