Hagerman Technology Bugle Pro User manual

HAGERMAN
T E C H N O L O G Y
Bugle Pro
Phono Preamp Kit

Bugle Pro Phono Preamp Kit Manual
2
Warnings
This product uses dangerous and potentially lethal voltages. Extreme care must be taken
while assembling this amplifier and should only be attempted by a skilled technician.
The instructions in this manual are a suggested guide only and no liability is assumed by
Hagerman Technology LLC.
Copyrights & Trademarks
©Copyright Hagerman Technology LLC 2004. All rights reserved. No part of this
document may be photocopied, reproduced, or translated to another language without the
prior written consent of Hagerman Technology LLC.
Disclaimer
The information contained in this document is subject to change without notice.
Hagerman Technology LLC shall not be liable for errors contained herein or for
consequential damages in connection with the furnishing, performance, or use of this
material. See Chapter 6 for warranty information.

Bugle Pro Phono Preamp Kit Manual
3
1 Before You Begin
Description
Congratulations! You have just purchased one of the highest performance-per-dollar
audiophile products available. The Bugle Pro was designed to be a simple yet flexible
phono stage capable of achieving very good sound quality comparable to far more costly
units. Variable equalization and a mono switch accommodate all older (pre-1955)
recordings. The circuit topology uses dual audio opamps to implement passive split
equalization filters and provide a low output impedance to drive interconnects. Gain can
be selected (fixed) to accommodate virtually any moving magnet or moving coil
cartridge. With a built-in power supply, the Bugle Pro offers a complete solution for
your vintage phono amplification needs.
The Bugle Pro half-kit comprises two blank circuit boards; two professionally cut and
screened chassis panels, and these instructions. To complete, you must purchase the
remaining components from Digi-Key (www.digikey.com).
Features
• Fully adjustable equalization
• Mono switch
• Built-in power supply
• Professional looking chassis
• 40dB to 60dB gain
• Clean, quiet solid-state design
• Quality components
Tools
You will need a few basic shop tools (screwdriver, pliers, wire cutters, etc.) and a fine-tip
soldering iron to build this kit.

Bugle Pro Phono Preamp Kit Manual
4
2 Parts to Buy
Parts List
This parts list is for a stock 40dB gain RIAA phono stage. You can order components
directly from www.digikey.com.
Component Qty DigiKey Reference Designators
4700uF 25V 4 P5159-ND C1, C2, C4, C5
470uF 25V 6 P5155-ND C3, C6, C7, C10
100nF 50V (2) 10 P4525-ND C8, C11
220nF 4 P3224-ND C1, C3, C4, C6
15nF 2 P3153-ND C2, C5
10nF 2 P3103-ND C2, C5
8.2nF 2 P3822-ND C2, C5
6.8nF 2 P3682-ND C2, C5
2.7nF 2 P3272-ND C2, C5
1.0 1W 2 1.0W-1-ND R1, R11
10 1W 2 10W-1-ND R2, R12
1k 1W 6 1.0KW-1-ND R4, R3, R6, R7, R9, R10
10k 1W 2 10KW-1-ND R5, R8
316 5 316XBK-ND R7, R13, R25, R31
1.00k 10 1.00KXBK-ND R9, R11, R12, R27, R29, R30
1.30k* 5 1.30KXBK-ND R3, R5, R21, R23
1.43k 10 1.43KXBK-ND R1, R14, R19, R32
1.82k 5 1.82KXBK-ND R14, R32
2.43k 5 2.43KXBK-ND R14, R32
3.65k 5 3.65KXBK-ND R14, R32
4.53k 5 4.53KXBK-ND R14, R32
8.45k 5 8.45KXBK-ND R8, R26
13.0k 10 13.0KXBK-ND R2, R4, R6, R10, R20, R22, R24, R28
47.5k 5 47.5KXBK-ND R15, R17, R33, R35
Diode, schottky 10 MBR1100-ND D1, D2, D3, D4, D5, D6, D7, D8
LED, panel 1 67-1148-ND
OPA2134 3 OPA2134PA-ND U1, U2, U3
LM7815 1 NJM78M15FA-ND U1
LM7915 1 NJM79M15FA-ND U2
RCA, red 2 CP-1412-ND
RCA, black 4 CP-1413-ND

Bugle Pro Phono Preamp Kit Manual
5
Ground jack 1 J587-ND
Socket, DIP 8 3 A400-ND
Ac input 1 Q205-ND
Fuse 2 F963-ND
Heat sink 2 HS191-ND
Transformer 1 TE70023-ND
Switch, mono 1 EG2351-ND
Switch, power 1 EG2350-ND
Switch, rotary 2 EG1954-ND
Power cord 1 Q120-ND
Knob 2 451-1121-ND
Standoff 8 1903CK-ND
Chassis 1 377-1152-ND
Screw, #6 100 H354-ND
* Depends on gain! Use 392 ohm for 60dB, 681 ohm for 50dB.

Bugle Pro Phono Preamp Kit Manual
6
3 Assembly
Step by Step
Please follow this systematic procedure for assembling the amplifier. Make sure you
have purchased all necessary components before you begin.
Chassis
 Use the blank circuit boards to mark mounting holes on the bottom chassis cover (see
Figure 4). Boards should be centered within plastic bosses. Drill 9/64” holes (#6
screw).
 Add eight standoffs using #6 screws.
 Add a ground ring (from spare RCA jack) to the mounting threads of the mono/stereo
switch. Use the other spare ring on the ground lug.
 Install all of the panel-mounted components. Set the stop ring on the rotary switches
to position # 6.
 Add knobs to the rotary switches. Insure rotation is correct so labelling is proper.
Figure 1. View of back panel.
 Connect resistors and capacitors to rotary switches per schematic. Keep leads as
short as possible. Wires will be added later.

Bugle Pro Phono Preamp Kit Manual
7
Circuit Boards
 Bend and form the leads on the resistors and install into their proper places. Solder in
place and trim leads.
 Install sockets.
 Install diodes.
 Install capacitors.
 Mount regulators to heat sinks using #4 hardware. Use #4 washers under the heat
sinks as small spacers. Solder in place.
 Install transformer.
 Add jumpers to S1 switch location on phono board. See Figure 3.
Figure 3. Jumpers for S1.
Locations R14, R32, C2, and C5 on phono board should be EMPTY. It is recommended
you remove solder flux from the circuit boards by soaking in 99% isopropyl alcohol for
½ and hour. Use a soft paintbrush to scrub. Rinse with clean alcohol and blow dry.
 Install opamps.
Integration
Use the schematic at the back of this manual as reference for wiring the boards and panel
components.
 Mount circuit boards into chassis. See Figure 4.
 Connect the power supply outputs (+/-15V) to the battery terminals on the phono
board. B1 is positive; B2 is negative (connect + to ground).
 Connect a ground wire from phono board (input side) to ground jack on rear panel,
and to the body of the mono/stereo switch.
 Connect twisted pair wires (or coaxial) from the input RCA jacks to their respective
inputs on the phono board.
 Connect output RCA jacks to phono board.
 Connect TURNOVER switch to R14 and R32 locations on phono board.

Bugle Pro Phono Preamp Kit Manual
8
 Connect CUT switch to C2 and C5 locations.
 Connect LED to power supply.
 Connect NEUTRAL terminal on ac input connector to the power supply transformer
primary. The dual primaries are wired in parallel for 115Vac operation (as shown in
schematic), and in series for 230Vac.
 Connect LINE terminal on ac input connector to power switch. Connect other
terminal on power switch to transformer primaries.
There is no need to connect EARTH ground since the chassis is plastic and all secondary
voltages are isolated. This helps to reduce ground loops.
Figure 4. Wiring of components.

Bugle Pro Phono Preamp Kit Manual
9
4 Testing & Installation
Testing
Performance testing is possible if you have access to laboratory test equipment, but is
typically unnecessary. You can do a basic test with a DVM by checking supply voltages
on the opamps and insuring there is no dc offset at the outputs.
Connections
Connect the Bugle Pro just like any other phono stage. The input and output jacks are
RCA types. Make sure the ground lead from the turntable is connected to the grounding
screw between the input jacks. Close proximity to large electric or magnetic fields may
induce hum or buzz into the signal.
Set the equalization switches to the “•” setting for modern RIAA. Information on settings
for various older records can be found at http://www.shellac.org/wams/wequal.html.

Bugle Pro Phono Preamp Kit Manual
10
5 Specifications
The following specifications are subject to change without notice. Values given are for
stock components at 40dB gain.
Item Specification
Gain 40dB to 60dB (fixed)
Input Impedance 47k ohm
Output Impedance 330 ohms
RIAA Response +/-0.5dB from 30Hz to 60kHz
Bandwidth (-3dB) 15Hz to 150kHz (minimum)
Distortion 0.05% @1kHz
SNR 74dB ref 5mV A-weighted*
Overload 55mV @1kHz
Fuse 0.125 amps
Size 8 x 7 x 3.5 inches
* Shorted inputs in absence of stray powerline fields.

Bugle Pro Phono Preamp Kit Manual
11
6 Warranty & Service
Warranty
Hagerman Technology LLC warrants this product free of defects in materials and
workmanship for 10 years. If you discover a defect, Hagerman Technology LLC 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 Technology LLC. 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 Technology LLC. 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 Technology LLC be liable for any loss, direct,
indirect, incidental, special, or consequential damage arising out of or in connection with
the use of this product.
Service
Refer to Chapter 4 for troubleshooting information. If the problem persists, contact
Hagerman Technology for service at [email protected].
Hagerman Technology LLC
PO Box 26437
Honolulu, HI 96825 USA
808-383-2704 (voice)
808-394-6076 (fax)

A A
B B
C C
D D
E E
F F
G G
5 5 4 4 3 3 2 2 1 1
21V 20V 18V 15V
This document contains proprietary information and except with written permission of Hagerman Technology LLC such information shall not be published, or disclosed to others, or used for any purpose, and the document shall not be copied in whole or in part. Copyright Hagerman Technology LLC 2003. All rights reserved. Notes: All resistors are 1W unless specified.
LED+ LED- GND GND -15V +15V
n/a A
Bugle: Power Supply Hagerman Technology P.O. Box 26437 Honolulu, HI 96825
11Friday, January 23, 2004
Title Size Document Number Rev Date: Sheet of
C1 4700uF 25V C4 4700uF 25V
T1 TE70023
R4 1k0
D2 MBR1100
R1 1R0 D3
MBR1100 D7 MBR1100 D5 MBR1100
R11 1R0
R7 1k0
R8 10k R5 10k
R2 10 R12 10
C2 4700uF 25V C5 4700uF 25V
U1 LM78M15
IN
1
GND
2
OUT 3
U2 LM79M15
IN
2GND
1
OUT 3
C6 940uF 2x25V C3 940uF 2x25V
D8 MBR1100 D1 MBR1100
D6 MBR1100 D4 MBR1100
R9 1k0
R3 1k0 R10 1k0
TP2 TP4 TP6 TP9
TP10 TP1 TP8 TP3 TP5 TP7
R6 1k0

A A
B B
C C
D D
E E
F F
G G
5 5 4 4 3 3 2 2 1 1
Same as above
Same as above
1 2 3 4 5 6
2 3 4 5 6
* Mounted off circuit board. This document contains proprietary information and except with written permission of Hagerman Technology LLC such information shall not be published, or disclosed to others, or used for any purpose, and the document shall not be copied in whole or in part. Copyright Hagerman Technology LLC 2004. All rights reserved.
150Hz 200Hz 300Hz 400Hz 500Hz 700Hz 16dB
13.7dB 12dB 10.5dB 5dB
n/a A
Bugle Pro Phono Hagerman Technology LLC P.O. Box 26437 Honolulu, HI 96825
11Wednesday, June 30, 2004
Title Size Document Number Rev Date: Sheet of
+15V
-15V
+15V
-15V
+15V
-15V
+15V
+15V
-15V
+15V
-15V
+15V
-15V
-15V
J2* InLeft R12
1k00
C3 220nF
R16 (Loading)
OPA2134 U1A
3 21
4 8
C7 470uF 25V
R17 47k5
R5 1k30 (681) (392)
R6 13k0 R10
13k0
R11 1k00
OPA2134 U2A
3 21
4 8
R3 1k30 (681) (392)
R4 13k0 C1
220nF
R8 8k45
R13 316
R9 1k00
OPA2134 U3A
3 21
4 8
R1 1k43
R2 13k0 R7
316
R15 47k5
C10 470uF 25V
C11 100nF
J1* OutLeft
C8 100nF
S3* Turnover
R14C 2k43 R14B 3k65 R14A 4k53 R14D 1k82 R14E 1k43 R14F 1k00
S4* Rolloff
C2A 2n7F C2B 6n8F C2C 8n2F C2D 10nF C2E 15nF
S2* Mono
J4* InRight R30
1k00
R34 (Loading)
OPA2134 U1B
5 67
4 8
R35 47k5
R23 1k30 (681) (392)
R24 13k0 R28
13k0
R29 1k00
OPA2134 U2B
5 67
4 8
R21 1k30 (681) (392)
R22 13k0 C4
220nF
R26 8k45
R31 316
R27 1k00
OPA2134 U3B
5 67
4 8
R19 1k43
R20 13k0 R25
316
R33 47k5
J3* OutRight
S3* Turnover
S4* Rolloff
J5* Gnd

A A
B B
C C
D D
E E
F F
G G
5 5 4 4 3 3 2 2 1 1
A
1 2 3 4 5 6
C
7 8 9 10 11 12
A
1 2 3 4 5 6
Replaces R14 Replaces C2 Replaces R32 Replaces C5
PHONO BOARD SUPPLY BOARD
C
7 8 9 10 11 12
n/a A
Bugle Pro Wiring Hagerman Technology P.O. Box 26437 Honolulu, HI 96825
11Wednesday, June 30, 2004
Title Size Document Number Rev Date: Sheet of
LED
Power On/Off
Mono/Stereo
In Right Out Right Out Left
Turnover
4k53
2n7F3k65
2k43 1k82 1k43 1k00
Turnover
4k53 3k65 2k43 1k82 1k43 1k00
Cut
6n8F 8n2F 10nF 15nF
GND
In Left
2n7F
Cut
6n8F 8n2F 10nF 15nF