Hagerman ONE WATTER User manual

ONE WATTER
Tube Pedal Amplifier
Made in USA

ONE WATTER – Tube Pedal Amplifier
2
Copyrights & Trademarks
 Copyright Hagerman Amplification 2021. All rights reserved. No part of this document
may e photocopied, reproduced, or translated to another language without prior
written consent.
Disclaimer
The information contained in this document is su ject to change without notice.
Hagerman Amplification shall not e lia le for errors contained herein or for
consequential damages in connection with the furnishing, performance, or use of this
material.
Warranty
Hagerman Amplification warrants this product free of defects in materials and
workmanship for a period of 10 years (90 days tu es and footswitch). If you discover a
defect, Hagerman Amplification 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 Amplification. This warranty does not apply if the product has
een damaged y negligence, accident, a use or misuse or misapplication, has een
damaged ecause it has een improperly connected to other equipment or has een
modified without the express written permission of Hagerman Amplification. This
warranty is limited to the replacement or repair of this product and not to damage to
equipment of other manufacturers. Any applica le implied warranties, including
warranty of merchanta ility, are limited in duration to a period of the express warranty
as provided herein eginning with the original date of purchase and no warranties,
whether express or implied shall apply to the product thereafter. Under no
circumstances shall Hagerman Amplification e lia le for any loss, direct, indirect,
incidental, special, or consequential damage arising out of or in connection with the use
of this product.
Hagerman Amplification
PO Box 61911
Honolulu, HI 96839
808-383-2704
www.hagamps.com

ONE WATTER – Tube Pedal Amplifier
3
Description
ONE WATTER is an all-new amplifier design targeting practice-at-home conditions. With
one watt of output power, this amplifier provides fa ulous tu e tone and overdrive at
reasona le listening levels. The clean channel employs a 12AY7 tu e for gain driving a
12BH7 (paralleled sections) running single-ended into an oversized output transformer.
The oost channel operates an EF86 pentode for extra gain and chime. Works great with
pedals! Drives any 8 or 16 ohm speaker ca inet. Play clean, play dirty.
Specifications
Item Specification
Output Power 1W clean @8 ohm (3W dirty)
Tu es 1 x EF86, 1 x 12AY7, 1 x 12BH7
Controls Gain, Bass, Tre le, Volume
Bandwidth 60Hz to 6kHz
Output Impedance 5 ohms
Boost Gain 28dB
Size 9” x 5” x 4.5”
Input Power 15Vdc @17W

ONE WATTER – Tube Pedal Amplifier
4
Operation
As with all tu e amplifiers, ONE WATTER takes approximately 30 seconds to warm up
and start working. The left footswitch turns unit on and off. Output jack connects
straight to any speaker ca inet.
For a line-level signal (recording or PA), use the right channel from a stereo plug on
output jack (left channel is speaker).
For maximally warm tones, run oost channel GAIN at a out 10 o’clock and VOLUME
a out 2 o’clock.
If you experience hum or uzz, use the supplied grounding wire to connect to an Earth
ground somewhere (center screw on outlet).
Warnings
Do not operate pedal without tu es installed!
Power tu e gets hot!
Do not spill liquids onto pedal.
Do not use a standard negative 9V pedal power supply, this unit uses positive 15V at
high current (1150mA).
Be careful not to reak glass of tu e when installing or removing.

R14 470k C7 47uF
+195V
R16 2k2 R17 220k
BOOST
C8 470uF
V1 EF86
R18 470k C9 47nF
C10 470pF
S2A S2C
J2
C11 4n7F
R20 500kA R21 10k
R13 10k D3 LED S2B
+15V
R19 470k
3
9
6
250V
90V 50V
8 1
2,7 BOOST
1V
10mV
+28dB 90-3kHz
COPYRIGHT 2021 HAGAMPS.COM

V2A 12AY7
R34 10k
C12 47uF
B+
V2B 12AY7
R24 2k2 R25 100k
C16 470pF
C14 47nF
C20 470uF
R27 500kA
C17 4n7F
R28 10k
R29 100k
R31 500kA R30 100k C18 470pF R32 10k C19 4n7F
R26 100k
BOOST
C15 470pF
R22 470k
V3 12BH7
R41 390
R38 500kB R39 10k
C13 470uF
R35 100k
C21 47nF
T1 P-T31
C23 470uF
J3
R36 10k
C22 47uF
+195V L2
1mH
R37 470k
100 10k
22 390
BASS
6
7
83
2
1
250V
TREBLE
VOLUME 250V
25:1
COPYRIGHT 2021 HAGAMPS.COM
110V
2V 4V
155V
1W
8V
60Hz-6kHz 0.6W CLEAN 3W DIRTY
BLU RED
+215V
200mV