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User Manual for Radial Engineering PowerTube Preamplifier Click to enlarge the picture
Contents of the user manual for the Radial Engineering PowerTube Preamplifier
- Product category: Microphone Preamps Radial Engineering
- Brand: Radial Engineering
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Radial Engineering Microphone Preamps
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User manual for the Radial Engineering PowerTube Preamplifier contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Radial Engineering product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Radial Engineering user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Radial Engineering product will considerably shorten its lifespan!
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Product description The Radial Engineering PowerTube Preamplifier is an old-school, 100%, discrete, class-A vacuum tube microphone amplifier, intended to capture the essence of the voice or instrument while adding the rich harmonics, warmth, and character of a transformer-coupled tube circuit.Designed to fit inside the Radial Workhorse and other 500 series racks, the single-wide PowerTube begins with an ultra low-noise Jensen input transformer. This exhibits near-perfect frequency response while producing the warm Bessel curve that is characteristic of a Jensen transformer. The signal is then amplified via a select 12AX7 tube using an innovative, non-radiating charge pump that supplies 140V to the tube to deliver the excitement and character of a high-voltage vintage tube amplifier. This feeds a class-A, balanced output stage that together can produce as much as 60dB of gain. This makes the PowerTube suitable for use with all microphones.Features include an easy-access front-panel XLR input with a safely recessed 48V phantom power switch. To optimize signal-to-noise, the PowerTube Preamplifier is equipped with fully variable trim and gain controls. A 10-segment LED bar graph provides visual feedback. Driving the PowerTube Preamplifier into the red is encouraged. This increases the grit, harmonic content, and distortion. For even more character, activating the air adds a slight edge to a male vocal or sparkle on an acoustic guitar. Low-frequency resonance is easily tamed using the high-pass filter. For added pleasure, the PowerTube Preamplifier comes factory-loaded with a select 12AX7 tube along with a second Tonebone distortion pedal tube for more grit and madness. - 10-Segment LED
- Provides visual signal status as it monitors average RMS peaks to deliver a clean, distortion-free signal to the mix buss and recording system.
- Trim
- The Trim control lets you set the input level going to the tube and class-A circuit. Set low for least distortion or high to add harmonic content and grit.
- 180° Polarity Reverse
- Used to phase-align 2 signals for greater accuracy or as a creative element during the recording process.
- Gain
- Lets you adjust the overall drive circuit. When pushed hard, the PowerTube adds character and harmonics to the signal path.
- Air
- High-frequency lift used to gently add presence to the signal path for more shimmer and clarity.
- Filter
- The 80 Hz high-pass filter removes low frequencies to help eliminate excessive bass. It is particularly useful when layering acoustic tracks.
- 48V
- Phantom power for condensers is equipped with power-on LED and recessed to prevent accidental use that could damage ribbon mics.
- Mic Input
- The XLR female connector is conveniently located on the front panel and placed at the bottom to keep the cable out of the way.
- Omniport
- Rear-mounted 1/4" instrument input, allows guitar and bass to be recorded direct. It is available when used with 500 series racks.
- Full Enclosure
- 100% steel casing reduces magnetic interference from other nearby modules that may cause pollution.
- 100% Discrete Class-A
- Output stage combines with the transformer and tube to deliver 60 dB of gain, making the PowerTube suitable for just about any microphone.
- Radial Push Switches
- Radial switches feature durable metal outer casing and are rated at over 20,000 cycles for added durability.
- Double-Layer Front Panel
- Steel construction adds rigidity to reduce stress on the PC board.
- Dual Potentiometers
- Doubled-up solder points for durability. Steel casing with steel shaft and retention nut will not bend when under stress.
- Heavy Duty XLR
- Glass-filled nylon connector with ultra-heavy nickel-silver solder lugs for optimal signal transfer and long-term reliability.
- 12AX7 Tube
- The PowerTube employs a select low-noise 12AX7 tube with a non-radiating 140V charge pump to deliver the performance of a high-voltage tube preamp.
- Gold-Plated 15-Pin Card Edge
- Double sided to ensure positive connection to the receptacle for improved mating.
- Jensen Transformer
- Special high-performance Jensen input transformer delivers accurate frequency response and low noise, making it suitable for noise-prone vacuum tube preamps.
- Power Assign Switch
- Lets you toggle the input supply from the positive or negative rail. This enables multiple PowerTubes to be used without power sag.
- Mil-Spec Circuit Board
- Features double-sided PCB and full ground plane to assure lowest possible noise and durability for years of trouble-free performance.
- Applications
- PowerTube Preamplifier for Studio Vocals (In Cube)
The PowerTube Preamplifier is the front end for your finest studio microphone. The Jensen transformer-coupled front end quietly delivers the full spectrum of the source into the class-A tube drive circuit for great results.
Live Recording (In Workhorse without Mixer)
The single-wide design and innovative powering scheme allows you to use 8 PowerTube Preamplifiers in the Workhorse without sacrificing dynamic range. This makes it suitable for the most demanding live music recording sessions.
PowerTube on Bass (In PowerStrip)
Connect a bass to the Omniport instrument input on the Workhorse, Cube, or PowerStrip. Feed the PowerTube into a Komit compressor for dynamic control and then a JDX amplifier and speaker simulator to capture the sound of a 4x12 half stack. UPC: 676101040476 In the Box Radial Engineering PowerTube Preamplifier Limited 3-Year Warranty on Parts & Labor Table of Contents
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Technical parametersRadial Engineering R700 0115 Specs | | | Circuit Type | 100% discrete class-A with 12AX7 tube drive | | Microphone Input | Transformer coupled, Jensen JT-115KE | | Current Draw | 235 mA | | Input Impedance | 900 Ω | | Frequency Response | 20 Hz to 20 kHz +0/-1 dB | | Gain | Mic Preamp Gain: 60 dB | | Maximum Gain | 75 dB when used with Workhorse rack and mixer | | Maximum Output | 22 dBu | | Output Impedance | 200 Ω | | Output Type | 100% discrete class-A FET | | Common Mode Rejection | >84 dB | | Equivalent Input Noise | -128 dBu at maximum gain | | Dynamic Range | >93 dB | | Total Harmonic Distortion | 0.05% | | Intermodulation Distortion | 0.011% | | | | Input Impedance | 150 kΩ, unbalanced, when used with Workhorse rack and mixer | | Gain | Instrument Preamp: 55 dB, unbalanced, when used with Workhorse rack and mixer | | Equivalent Input Noise | -95 dBu, unbalanced, when used with Workhorse rack and mixer | | Total Harmonic Distortion | 0.1% | | | | Meter | 10-segment peak indicator with hold | | Pad | Variable | | Polarity | Variable | | | | High-Pass Filter | 250 Hz cut-off, -3 dB at 150 Hz | | Control | Presence boost at 5 kHz | | Phantom Power | 48 VDC: 10 mA (as supplied by 500 frame) | | Configuration | XLR: AES spec: pin-1 ground, pin-2 (+), pin-3 (-) | | Lift | Ground Lift (Rear Panel): Lifts ground on front panel XLR input only | | | | Compliance | API & WHOS-Doc | | Weight | 1.5 lb (0.7 kg) | | | | Package Weight | 1.95 lb | | Box Dimensions (LxWxH) | 8.9 x 6.7 x 1.4" |
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