Tonebone PowerTube Preamplifier

Tonebone PowerTube Preamplifier

Tonebone PowerTube Preamplifier

B&H # TOPOWERTUBE MFR # R700 0115
Special Order
Expected availability: 7-10 business days 
Free Standard Shipping
Not eligible for Free Expedited Shipping

Product Highlights

  • High-Voltage 12AX7 Tube Drive
  • 60dB Gain
  • Smooth-Sounding Jensen Transformer Input
  • 100% Discrete Class-A Electronics
  • Single-Wide Module
  • Fits All 500 Series Rack Formats
Show moreShow less
Man Behind Layer

B&H $1000 Giveaway

Share your most-wanted item with friends & family for chances to win a $1000 B&H Gift Card. It's that easy!

1 new winner announced every week!
Limit 1 entry per day; Come back every day to increase your chance of winning!

Be sure to mention #BHWishList when you share!

Share on Twitter Share on Facebook

Congrats to our winners so far — Mark P., Lauren K. & Daniel M.

Official Rules

OFFICIAL B&H $1,000.00 GIVEAWAY RULES

NO PURCHASE IS NECESSARY TO ENTER OR WIN. The B&H $1,000.00 Giveaway (the "Giveaway" or "Sweepstakes") is void where prohibited by law and is sponsored by B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 ("Sponsor"). It is not sponsored or endorsed by Facebook or Twitter in any way.

Entry Period/Methods of Entry. The Sweepstakes will run from on or about November 7, 2016 until on or about December 19, 2016 (the "Entry Period"). Entries received outside the Entry Period are void. Enter the Sweepstakes via either one of the following methods. (1) Share your most wanted item on Facebook or Twitter via the dedicated links found on the B&H Website (www.bhphoto.com); or (2) Mail a postcard (postmarked during the Entry Period) containing your name, address, phone number, and email address, and indicate the subject(s), if any, about which you are interested in receiving future emails from B&H (e.g. photo, video, audio, computers, home theater, portable entertainment ) (optional) to: B&H $1,000.00 Giveaway, c/o B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 (either option, an "Entry"). Entries must not, in the sole and absolute discretion of the Sponsor, contain obscene, provocative, defamatory, sexually explicit, or otherwise objectionable or inappropriate content. Entries deemed by Sponsor to be inappropriate will be disqualified. Entries owned by a third party, or the use of any trademarks, service marks, logos, brands, or products owned by a third-party are not acceptable for entry into the Sweepstakes. Limit 1 entry per person, per day.

Winner Selection/Prizes/Odds. The B&H Social Team will randomly select a winner from among all eligible entries every Monday during the Entry Period, for a total three (3) winners (each a "Winner"). Each Winner will receive a B&H Gift Card pre-valued in the amount of $1000.00. No cash or other substitutions will be offered. Winner selection is in the sole and absolute discretion of the B&H Social Team. Any taxes are the sole responsibility of the winner. Winners will be notified and receive their prize to the e-mail address associated with the account to which their Entry was posted or the email account provided with a mail-in entry. The odds of winning depend on the number of eligible entries received.

Identity of Winners/Eligible Participants. Winners will be identified by the e-mail account associated with the Facebook or Twitter account from which their Entry was submitted or the email account provided with a mail-in entry. An e-mail account holder shall mean the natural person assigned to such e-mail account by the internet access or online service provider or other organization responsible for assigning e-mail addresses for the domain associated with such e-mail account. Any issues regarding the identity of a Winner shall be resolved by Sponsor in its sole discretion. The Sweepstakes is only open to residents of the United States that are at least eighteen (18) years of age on their entry date and is not open to employees of Sponsor, their immediate family, any person domiciled with such employees, or any affiliates or subsidiaries of Sponsor.

Entry Ownership/Entrant Agreements. Entrants retain full ownership and copyrights to their Submission. However, by entering the Sweepstakes entrants grant Sponsor permission to use their Entries for promotional purposes on their respective social media channels with proper credit. Entrants also agree: (a) to be bound by these Official B&H $1,000.00 Giveaway Rules; (b) that any claims related to this Sweepstakes shall be resolved individually without resort to any form of class action and that awards, shall be limited to actual out-of-pocket costs incurred in entering the Sweepstakes, and shall not include incidental or consequential damages or attorneys fees; and (c) that any actual or perceived ambiguities in these rules shall be interpreted by Sponsor in their sole discretion.

Limitation of Liability/Sponsor Modification/Cancellation Rights/ Choice of Law/ Venue/ Winners List. Sponsor is not responsible for incomplete entries or for failure to receive entries due to technical failures or human error of any kind. Winners agree that Sponsor will have no responsibility for losses or damage of any kind resulting from the acceptance, possession, or use of the prizes. Except where prohibited, participation in the Sweepstakes constitutes entrant's consent to the publication of his or her name by Sponsor in any media for commercial or promotional purposes without limitation or further compensation subject to Sponsor's respective Privacy Policies. Sponsor may modify or discontinue the Sweepstakes at any time and may disqualify from the Sweepstakes any person it determines, in its sole discretion, to have attempted to or actually tampered with or otherwise abused any aspect of the Sweepstakes. Entrants agree that in the unlikely event a dispute arises in connection with this Sweepstakes, it will be governed by the laws of the State of New York and heard exclusively in a court of applicable jurisdiction in the County and State of New York irrespective of any choice of law provisions to the contrary. To receive names of the winners by U.S. mail, please mail a self-addressed stamped envelope to: B&H Foto & Electronics Corp., Attn: B&H $1,000.00 Giveaway, 440 Ninth Avenue, New York, NY 10001. Any Winners List request must be received by B&H within one (1) year of the date the Sweepstakes is conducted.

Let us know how to reach you if you win!

Privacy 100% guaranteed; email address for contact purposes only

Email

Already have a B&H account? Just log in tomorrow to enter again!

$0.00 Tax Collected Outside NY

You Pay: $699.99

Add to Wish List Item in Wish List
  • 1Description

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
Tonebone PowerTube Preamplifier
  • Limited 3-Year Warranty on Parts & Labor
  • Table of Contents
    • 1Description
    Microphone Inputs
    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%
    Instrument Inputs
    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%
    Control Panel
    Meter 10-segment peak indicator with hold
    Pad Variable
    Polarity Variable
    General
    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
    Mechanical
    Compliance API & WHOS-Doc
    Weight 1.5 lb (0.7 kg)
    Packaging Info
    Package Weight 1.95 lb
    Box Dimensions (LxWxH) 8.9 x 6.7 x 1.4"

    Tonebone PowerTube Preamplifier Review

    Be the first to review this item
    See any errors on this page? Let us know.