Hagerman Audio Labs TRUMPET REFERENCE User manual

TRUMPET
REFERENCE
Vacuum Tube Phonostage
Made in USA.

TRUMPET REFERENCE Vacuum Tube Phonostage
2
Copyrights & Trademarks
©Copyright Hagerman Audio Labs 2013. 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 (90 days on tubes). 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

TRUMPET REFERENCE Vacuum Tube Phonostage
3
Description
The Trumpet Reference is a true reference-class phonostage for the most demanding
of audiophiles. Based on the original Trumpet (Stereophile class-A recommended
component), it adds pushbutton control of all functions, a second input, and
upgrades for many of the components. The chassis has also been changed to reflect
the reality of equipment racks by putting the power supply and amplifier boards in a
side-by-side configuration. Status LEDs on the front panel indicate operational
settings of the various functions. In addition to standard RIAA equalization, three
other curves used in the LP "microgroove" era have been included. This combination
of features, convenience, and sonic performance are unmatched at this price.
Specifications
Item Specification
Gain 44dB (MM) / 64dB, 70dB (MC)
Input Impedance 47k (MM) / 1k, 322, 181, 131, 91, 76, 64, 57 (MC)
Output Impedance 800 ohm
RIAA Response +/-0.5dB from 20Hz to 20kHz
Bandwidth 8Hz to 500kHz
Distortion <0.05% @1kHz
Noise 70dBA (MC)
Size 17” x 12” x 5”
Weight 19 lbs.
Power 120Vac / 240Vac, 70W
Tube Compliment 12AX7 x 4, 12AU7 x 4

TRUMPET REFERENCE Vacuum Tube Phonostage
4
Operation
The Trumpet Reference installs between your turntable and linestage. Be sure to
connect the ground lead to the grounding lug near the inputs. Connect the power
cord to an AC source. Turn on using the power switch on the back panel. Press the
POWER button on the front. Immediately the heaters will turn on and after a 32
second delay the high voltage supplies will activate.
Controls
Control Description
POWER This button toggles power on and off. The left LED indicates
heater voltage for the tubes; the right LED indicates high
voltage.
EQ There are four settings defined by turnover and cut, arranged
left to right:
400Hz / 11dB (AES, early ffrr)
500Hz / 11dB (Decca, EMI, late ffrr)
500Hz / 13.7dB (RIAA)
500Hz / 16dB (Columbia, NAB)
STEREO Left LED is mono.
INPUT Left LED is MM.
POLARITY Left LED is inverted (MC).
GAIN There are two gain settings (MC):
64dB (>0.25mV cart)
70dB (<0.25mV cart)
LOADING There are eight loading settings (MC), arranged left to right:
1k
322
181
131
91
76
64
57

TRUMPET REFERENCE Vacuum Tube Phonostage
5
Commentary
The Trumpet Reference responds admirably to tube rolling. New old stock (NOS)
tubes are generally the best, offering various sonic improvements, with the final
result becoming a matter of personal taste. Try to match in left/right pairs, to
maintain equalization frequency balance. Always replace tubes with their
equivalents! Do not use, for example, a 12AT7 in one of the 12AX7 locations.
Starting from the rear of the unit, the tubes are in order: 12AX7, 12AX7, 12AU7,
12AU7.
Cartridge loading depends on the length and type of interconnects used and it is
always good to start with a value close to the manufacturer’s recommendation.
Generally, loading provided by the Trumpet Reference is effectively lower than the
equivalent from a transformer. That is, if you like the sound from 100 ohm
transformer loading (into the MM input), then try the 131 ohm setting on the MC
input. In the end, do not worry about numbers. Adjust to what your ears prefer.
As far as gain selection, it is better to go with lower gain if possible. This optimizes
overall headroom and distortion of the audio system.
The EQ settings provide various curves for achieving better sound from your vinyl
playback. The 3rd LED from the left is RIAA (modern) as will be used most often. The
Decca and Columbia curves help with some older microgroove LPs. Again, this is
adjusted for personal preference, and was never an exact science. Nevertheless, this
can make a significant improvement for certain instruments such as violin and on
vocals.

J4
J2
J3

C1 100nF
VCC
RES A0
P6 P7
18 09
16 17
06 05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
U2 MCP23008
S1 POWER
2 1 3 4 5 6
S2 EQ S3
POL S4
STEREO S5
INPUT S6
GAIN S7
LOAD
VCC
B7 B6 A5 B5 B2 A3
B1 B3 A6 A7
B0 A1 A2
02
07 09 15 16
06 18 01 08 13 12 04 11
A4
U1
05
03
14 PIC16F88
17 A0
B4 10
R2 10k R3
10k R4
10k
CLR SDA SCL
R5 1k R6
1k
D1 YEL D2
YEL
C2 100nF
2 1 3 4 5 6
R1 10k
2 1 3 4 5 6 7 8 9 10 11 12
LOAD0
HEATER
POWER LOAD1 LOAD2
MONO GAIN
INPUT
BASS CUT0 CUT1
POLAR
MUTE
2 1 3 4
R8 100 R7 1k
VCC
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
J1
MCLR VCC GND PCLK PDAT
SCL SDA
INT TX RX ENA
VBBVCC
B+ H+
0x07
J2
+5V +5V GND POW GND HEAT
J3
LOAD0 LOAD1 LOAD2 GAIN MONO INPUT BASS CUT0 CUT1 POLAR MUTE
J4
+5V GND RX TX
DIODES NOT SHOWN

R13 1k
CLR
D7 YEL
RES A0
P6 P7
18 09
16 17
06
U4 MCP23008
05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
VCC
R14 1k D8 YEL
R15 1k D9 YEL
R16 1k D10 YEL
R17 1k D11 YEL
R18 1k D12 YEL
R19 1k D13 YEL
R20 1k D14 YEL
SCL SDA
R9 1k
CLR
D3 YEL
RES A0
P6 P7
18 09
16 17
06
U3 MCP23008
05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
VCC
R10 1k D4 YEL
R11 1k D5 YEL
R12 1k D6 YEL
SCL SDA
C3 100nF
VCC
C4 100nF
VCC
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
0x00 0x01
D00 D01 D02 D03
D15D14D13D12D11D10D09D08

R21 1k
CLR
D15 YEL
RES A0
P6 P7
18 09
16 17
06
U5 MCP23008
05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
VCC
R22 1k D16 YEL
R23 1k D17 YEL
R24 1k D18 YEL
R25 1k D19 YEL
R26 1k D20 YEL
R27 1k D21 YEL
R28 1k D22 YEL
SCL SDA
C5 100nF
VCC
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
0x02
D16 D17 D18 D19 D20 D21 D22 D23

LOAD0
ENABLE
C6 100nF
RES A0
P6 P7
18 09
16 17
06
U6 MCP23008
05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
VCC
SDA SCK
R34 1k R33
1k R32
1k R31
1k R30
1k R29
1k
Q6 ZTX549 Q5
ZTX549 Q4
ZTX549 Q3
ZTX549 Q2
ZTX549 Q1
ZTX549
LOAD1 LOAD2 MONO GAIN INPUT
VCC
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
0x03

BASS
ENABLE
C7 100nF
RES A0
P6 P7
18 09
16 17
06
U7 MCP23008
05
P5 P4 P3 P2 P1 P0
15 14 13 12 11 10
SCL SDA A2 A1
04 03 02 01
INT 08
VCC
SDA SCK
R40 1k R39
1k R38
1k R37
1k R36
1k R35
1k
Q12 ZTX549 Q11
ZTX549 Q10
ZTX549 Q9
ZTX549 Q8
ZTX549 Q7
ZTX549
CUT0 CUT1 POLAR MUTE HEATER
VCC
Q13 ZTX549 R41 1k
POWER
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
0x04

L1
D2 1N5821
L2
D3 1N5821
T1 372FX
D4 1N5821
D1 1N5821
C2 10mF
ADJ OUT
1 3
4 2
U1 KA278RA05
C4 1mF
C1 10nF
C3 10mF
N2 N1
6VAC 6VAC 600VAC 600VAC
2 1 3 4 5 6
2 1 3 4 5 6
+300V +6V
-300V
+5V
POWER HEATER
R16 1k D15 LED
+5V
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
J1
+300V +6V GND +6V GND -300V
J2
+5V GND +5V GND POWER HEAT

D6 1N5821
D7 1N5821 D8
1N5821
D5 1N5821
C7 10mF
ADJ OUT
1 3
4 2
U3 KA278RA05
C10 1mF
C8 10mF
6VAC 6VAC
R3 1k30
R4 0R22
C5 10mF
ADJ OUT
1 3
4 2
U2 KA278RA05 R2
0R22
C9 1mF
R1 1k30
C6 10mF
+6V
8
S1
1 27
HEATERS
R17 1k D16 LED
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

R9 100 R10 100
SIG-IN SIG-IN
8
S3
1 27
C11 10nF R5 4k7 C12 10nF R6 4k7
8
S2
1 27
POWER
D9 1N4007 D10 1N4007 D12 1N4007 D11 1N4007
C13 10nF C14 10nF
R7 10 R8 10
L1 157J L2 157J
L3 157J L4 157J
C15 100uF C17
100uF
C16 100uF C18
100uF
R11 330 R12 330
+250V
-250V
R14 100k D13 LED R15 100k D14 LED
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

C1 100uF
-250V
+250V
C2 100uF
C3 1uF C4 1uF
R1 1k R2 1k
C5 100uF C6 100uF
C7 1uF C8 1uF
+230V
-230V
2 1 3 4 5 6 2 1 3 4 5 6 8 7 9 10 11 12
LOAD0 LOAD1 LOAD2 MONO GAIN INPUT BASS CUT0 CUT1 POLAR MUTE
+6V
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
J1
+300V +6V GND +6V GND -300V
J2
LOAD0 LOAD2 LOAD1 MONO GAIN INPUT BASS CUT1 CUT0 POLAR MUTE

R6* 470 81
2 3 4
7 6 5
S4 Z2132
J3*
LOAD2
81
2 3 4
7 6 5
S3 Z2132
R5* 220
81
2 3 4
7 6 5
S2 Z2132
R4* 100
R3* 1k
LOAD1 LOAD0
81
2 3 4
7 6 5
S1 Z2132
MONO
C19* 1mF
Q1A* LSK389 Q1B*
LSK389
R14* 10k R15*
10k
R12* 470 R13* 100
81
2 3 4
7 6 5
S5* Z2132
R10* 4k7 R11*
4k7 C21*
220nF PRE+
GAIN
C20* 1mF
+270V
-270V
C17* 0pF
C22* 220nF PRE-
R7* 22
R8 100k R9
100k
R16 100k R17
100k
R21* 22
D5 15V D6 15V
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

PRE+
81
2 3 4
7 6 5
S6* Z2132
INPUT
J4*
R18* 220k R20*
68k
81
2 3 4
7 6 5
S1* Z2132
MONO
R19* 220k
PRE-
INPUT-INPUT+
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

V1A* 12AX7
R22* 220k
R23* 220
R26* 150k R30* 150k
C26* 10uF
V1B*
12AX7
R27* 150k R24*
220k
R31* 150k
R25* 220
R28* 150k R29*
150k
D1* 1N4148
INPUT+ INPUT-
C23* 47nF R32*
10k
81
2 3 4
7 6 5
S8 Z2132
R33* 22k
BASS
C24* 220nF C25*
220nF BASS+BASS-
+270V
-270V
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839