WOO AUDIO WA2 Stereo Headphone & Pre Amplifier Single-Ended, Class-A, Output Transformer-Less (OTL) Owner’s Manual Please review this manual before operating your WOO AUDIO™ product. tm ©2011 WOO AUDIO Inc. All rights reserved. www.wooaudio.com Rev 1.1. May 24, 2012.
Important Safety Information CAUTION: These amplifiers are shipped without the vacuum tubes installed. It is necessary to install the tubes first. The tubes must be installed correctly or serious damage that is not covered by the warranty will result. Turn off immediately in the event of malfunction Should you notice smoke or an unusual smell coming from the equipments, turn it off immediately. Continued operation could result in injury. Do not disassemble High voltage circuit.
Table of Contents IMPORTANT SAFETY INFORMATION 2 TABLE OF CONTENTS 3 OVERVIEW 4 QUICK INSTALLATION 5 OPERATION 9 COMPATIBLE TUBES 11 FAQ - FREQUENTLY ASKED QUESTIONS 12 WARRANTY AND SERVICE 13 REVIEWS 14 PRODUCT SPECIFICATION 15 tm ©2011 WOO AUDIO Inc. All rights reserved. www.wooaudio.com Rev 1.1. May 24, 2012.
Overview Thank you for choosing a Woo Audio product. The WA2 is finely hand-crafted amplifier that delivers uncompromised performance and superior listening experience. Point-to-Point wiring Two 6AS7 / 6080 power tubes Two 6922 / 6DJ8 drive tubes Two EZ80 rectification tubes Pseudo-dual power supply One pair of pre-amp RCA output Four pairs of selectable RCA inputs One TRS (¼" or 6.
Quick Installation What’s in the box? ① WA2 amplifier ② One matched pair of 6922 rectifier tubes ③ One matched pair of EC80 rectifier tubes ④ One matched pair of 6080 power tubes The actual tubes may look different. Compatible tubes may be included instead of the ones illustrated above. Power cord and interconnection cable are not included. tm ©2011 WOO AUDIO Inc. All rights reserved. www.wooaudio.com Rev 1.1. May 24, 2012.
Installing the power tubes: Note: avoid oil or smudge on the tube glass; clean hands before installation. 1. Find the correct tube for the socket. There is a label below each tube socket that indicates a standard tube for the amplifier. For example, a 6080 tube should install on the “6080” labeling socket. You MUST use the compatible tube or serious damage may occur to the amplifier. See Compatible Tube section for all the approved direct substitute tubes. 2. Align the tube guide pin to the socket as below.
. 4. Check installation. The tube pins should be inserted fully into the tube socket receptacles. Installing driver and rectifier tubes: Bottom of the tube Align the tube to the socket Insert the tube perpendicular to the socket Use both hands if needed Selecting AC voltage: WARNING: failure to select the correct voltage will result in damage of the amp. Switch to label “115” for AC100 to 125V voltage. tm ©2011 WOO AUDIO Inc. All rights reserved.
Installing the power cord: Plug the power cord into the AC inlet. See ① in the below diagram. The AC inlet socket is a standard IEC type. You will need to obtain the correct type for your region. U.S. European U.K. Installing the source input: Plug the RCA interconnection cable into the RCA connectors; see ④ in the below diagram. Back panel diagram: ① AC inlet ② AC voltage selection switch ③ RCA pre-amp output ④ RCA inputs, 4 pairs tm ©2011 WOO AUDIO Inc. All rights reserved. www.wooaudio.
Operation DO NOT o Turn on the amp before properly installing ALL tubes. o Use tubes that are not approved by Woo Audio. o Turn on the equipment without checking the correct AC voltage setting. o Remove any tubes or the DC cord while the amp is operating o Touch tubes (extremely hot) after warm-up. o Leave the amps running unattended. To use the amps safely, please allow it to cool down for every 8 hours of continuous play time.
Turning the amplifier on: 1. Turn the volume knob to the lowest position. 2. Insert a headphone into phone jack ①. 3. Press the power switch ④ to a locking position. The LED will light. 4. Observe that all tubes light gradually. 5. Let the tubes warm up for at least 1 minute before turning up the volume.
Power Rectifier Driver Compatible Tubes Model 6922 * 6DJ8 6N1P 7308 E188CC E88CC E288CC ECC88 CCa EZ80 * 6CA4 6V4 EZ81 U709 6080 * 421A 5998 6AS7 6H13C 6N5P 7236 2399 6520 Adapter No No No No No No No No No No No No No No No No No No No No No No No Comment Greater power. Western Electric branded. Greater power Greater power * The most current chart can be found in this document: http://tinyurl.com/4wbv5qn tm ©2011 WOO AUDIO Inc. All rights reserved. www.wooaudio.com Rev 1.1. May 24, 2012.
FAQ - Frequently Asked Questions There is abnormal sound right after turning on the amplifier. This is normal from a cold start as the tubes are warming up to get into the proper working state. The noise will disappear gradually. Can I change headphone while the amplifier is on? Yes, but you must first minimize the volume. No sound is coming out of the headphone. o o o o Check that all tubes are properly installed. Check that the source is properly installed and is working fine.
Warranty and Service Woo Audio warrants this product free from defects in materials and workmanship for 1 year from the original date of purchase. The tubes are warranted for 30 days unless otherwise stated. In the event that your Woo Audio product requires servicing, please contact us directly to get a return instruction. If the equipment needs to be shipped back, please use the original packaging and include a copy of the sales purchase along with a detailed explanation of the problem(s).
Reviews “[The WA2] has iron-fisted control of any headphone I throw at it, and most importantly – it communicates with me and my emotions.– xenithon@head-fi “Woo 22 balanced headphone amp which, with the premium tube upgrades, presents the most effortless, immediate presentation of sound I have heard from any headphone system, or perhaps any stereo system.
Product Specification Model: WA2 Headphones Impedance: 26-600 Ohms Input Impedance: 100 Kilo-Ohms Frequency Response: 8 Hz - 100 KHz, -3dB Power Output: 310mW @32Ω 400mW @60Ω 550mW @120Ω 640mW @300Ω 480mW @600Ω (with 6080 tube) Signal/Noise: 95 dB THD: <= 0.8% Voltage: AC 110/220 - 240V, 50/60 Hz, switchable External Dimension, end to end 5.5" (H) x 13 (W) x 9" (D) measurement, same for both units: Weight: 17 pounds Woo Audio is committed to continuously improve its products.