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TUBA Headphone Amplifier 

 

 

Copyrights & Trademarks 

 

 Copyright Hagerman Audio Labs 2019. All rights reserved. No part of this document 

may be photocopied, reproduced, or translated to another language without the prior 
written consent.  
 

Disclaimer 

 
The  information  contained  in  this  document  is  subject  to  change  without  notice. 
Hagerman Audio Labs shall not be liable for errors contained herein or for consequential 
damages in connection with the furnishing, performance, or use of this material.  
 

Warranty 

 
Hagerman  Audio  Labs  warrants  this  product  free  of  defects  in  materials  and 
workmanship  for  a  period  of  10  years.  If  you  discover  a  defect,  Hagerman  Audio  Labs 
will, at its option, repair or replace the product at no charge to you provided you return 
it during the warranty period, transportation charges prepaid to Hagerman Audio Labs. 
This warranty does not apply if the product has been damaged by negligence, accident, 
abuse or misuse or misapplication, has been damaged because it has been improperly 
connected  to  other  equipment  or  has  been  modified  without  the  express  written 
permission  of  Hagerman  Audio  Labs.  This  warranty  is  limited  to  the  replacement  or 
repair  of  this  product  and  not  to  damage  to  equipment  of  other  manufacturers.  Any 
applicable  implied  warranties,  including  warranty  of  merchantability,  are  limited  in 
duration  to  a  period  of  the  express  warranty  as  provided  herein  beginning  with  the 
original date of purchase and no warranties, whether express or implied shall apply to 
the product thereafter. Under no circumstances shall Hagerman Audio Labs be liable for 
any loss, direct, indirect, incidental, special, or consequential damage arising out of or in 
connection with the use of this product.  
 

Hagerman Audio Labs 

PO Box 61911 
Honolulu, HI 96839 
808-383-2704 
www.haglabs.com 

Summary of Contents for TUBA

Page 1: ...TUBA Headphone Amplifier Made in USA ...

Page 2: ...rges prepaid to Hagerman Audio Labs This warranty does not apply if the product has been damaged by negligence accident abuse or misuse or misapplication has been damaged because it has been improperly connected to other equipment or has been modified without the express written permission of Hagerman Audio Labs This warranty is limited to the replacement or repair of this product and not to damag...

Page 3: ...very low distortion and huge signal headroom An internal switching power supply boosts the 15Vdc input by a factor of ten for B after a 30 second warm up delay The amplifier is conveniently turned on and off by pressing the volume knob inwards Specifications Item Specification Sensitivity 3 5Vrms Input Impedance 50k ohm Output Impedance 5 35 ohm LO HI Bandwidth 10Hz to 150kHz Output Power 350mW 32...

Page 4: ...he 15Vdc wall wart power supply and plug in Attach RCA interconnects to your favorite source linestage phonostage computer Plug in headphones on front panel Press VOLUME knob to turn on Left side indicator should light up immediately After 30 seconds or so the high voltage will fire up and turn on the right side indicator ...

Page 5: ...8k2 R7 8k2 C2 470uF C4 470pF L1 50uH C1 47nF R3 3R3 D3 1N4937 C3 47uF R5 220k R4 220k 15V Q2 2N3906 Q1 PFET R1 4k7 R2 100 D1 LED S1A R6 2k2 DRIVE H1 6V H2 6V C12 470uF R16 2k2 Hagerman Audio Labs PO Box 61911 Honolulu HI 96839 25V 5W 25V 25V 1340mA 15V 760mA 12V ...

Page 6: ...E D2 LED V1 EL84 R14 330 C10 470nF C11 470uF R13 330 L22 157G R15 330 R10 330 C7 47uF C9 4u7F R12 50k J3 J4 C8 470nF 15V R17 4R7 T1 119DA Q4 2N3906 Hagerman Audio Labs PO Box 61911 Honolulu HI 96839 140V 16V 25V 30H 250V 250V 250V 7 2 3 9 15mA 5V 150V LOG 350mW 5 OHM 7VRMS 1 3VRMS ...

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