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The Wheatfield HA-1 Owner's Manual
Headphone Amplifier
HeadRoom Corporation
Wheatfield Audio HA-1 Tube Amplifier
The HA-1 Headphone Amp / Pre-Amp from
Wheatfield Audio is an affordable vacuum-tube
headphone amplifier that is also designed to be
used as a single-source pre-amp to drive a power
amplifier.
www.headphone.com
obsessed headphone geeks at your service.
The AirHead and Total AirHead Owner's Manual
1
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Table of Contents
Related Manuals for HeadRoom Wheatlield HA-1
Summary of Contents for HeadRoom Wheatlield HA-1
- Page 1 The Wheatfield HA-1 Owner’s Manual Headphone Amplifier HeadRoom Corporation Wheatfield Audio HA-1 Tube Amplifier The HA-1 Headphone Amp / Pre-Amp from Wheatfield Audio is an affordable vacuum-tube headphone amplifier that is also designed to be used as a single-source pre-amp to drive a power amplifier.
- Page 2 Elegant Simplicity We believe in simplicity. So, the circuitry employed in the HA-1 is as simple as possible. A single-ended, class A triode gain stage is directly coupled to a single- ended triode cathode follower. No negative feedback is employed. There is only one capacitor (actually two in parallel, an electrolytic and a polypropylene) directly in the signal path.
- Page 3 A Zero-Feedback, Single-Source Pre-Amp The HA-1 is an excellent single-source pre-amp to act as a line stage between a CD player and a power amplifier. It’s ideal for use in a simple system, or to drive a single-ended triode power amp to provide a true all-triode, zero-feedback system. It can also be used between a source (like a CD player) and a pre-amp or integrated amp, to provide the utmost headphone listening quality, and to add some tube “character”...
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Page 4: Important Safety Information
Important Safety Information The HA-1 is a tube amplifier. As such, there are some safety precautions that you need to observe. CAUTION: HOT SURFACES.KEEP COMBUSTIBLES AWAY FROM TUBES. DO NOT BLOCK AIR FLOW AROUND AMPLIFIER. DANGER: TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE COVER. -
Page 5: Unpacking The Amplifier
Unpacking, Setup, and Connection Unpacking the Amplifier Carefully unpack your HA-1 amplifier. Inside the package, you will find the amplifier, a power cord, and this manual (guess you already found that, huh?) It’s always a good idea to save the original packing material. Checking the tubes The HA-1 is shipped with the tubes pre-installed. -
Page 6: Listening With The Ha-1 And Headphones
Listening with the HA-1 and headphones It’s best to start out with the volume control knob turned all the way down (counter- clockwise) until you’re familiar with the HA-1. Turn the amp on, using the font panel power switch. It’s OK to leave your headphones plugged in when you turn the amplifier on and off –... -
Page 7: Replacing Tubes
Replacing Tubes Tubes don’t last forever, so you can expect to replace the tubes from time to time. We have operated the HA-1 for more than 2500 hours, with no noticeable degradation of the tubes. We expect that the tubes will last between 4,000 and 10,000 hours before needing replacement. -
Page 8: Specifications
Tweaks... We will make one exception to this rule, however. That exception is the tubes. You may replace the tubes with others OF THE SAME OR ELECTRICALLY EQUIVALENT TYPE if you desire, without endangering your warranty. We use some very high quality tubes in the HA-1. Specifically: The voltage amplifier tube is a JJ/Tesla ECC82, a current production type that is among the best ECC82/12AU7 types available –... - Page 9 General Input impedance: 50k ohms Input connections: Unbalanced, gold-plated RCA Tube complement: 1x ECC82 (12AU7), 2x 7044 Power supply: Silicon rectifier, 3-stage RC filter Power requirement: 117V, 60 Hz, 50W Dimensions: 9.5” W x 4” H x 7.5” D Weight: TBD As a Headphone Amplifier Frequency Response (+/- 3dB) : 600 ohm load: <9Hz - 250kHz...
- Page 10 Because HeadRoom amps must be capable of driving even the most inefficient dynamic headphones to satisfactory listening lev- els, the amps are able to drive headphones of average and high efficiencies to very high levels.
- Page 11 30-day Satisfaction Guaranty Unless specifically stated, all HeadRoom purchases come with a 30-day satisfaction guaranty. We do this because we want to give you the opportunity to change your mind after you get to hear the products you bought. We’re very glad to give you this option, and we want you to use it if you aren’t happy with your purchase, but we also want you to be aware of the...
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Page 12: Two-Year Product Warranty
8184. We will try to diagnose the problem over the phone, which can save both of us considerable time, effort and money. If the equipment must be returned for repair, we will authorize a return for you. HeadRoom is the only authorized service center for HeadRoom products, either in or out of war- ranty.
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