Hagerman Audio Labs Trumpet MC User manual

TRUMPET MC
Phonostage
Made in USA

TRUMPET MC Phonostage
2
Copyrights & Trademarks
 Copyright Hagerman Audio Labs 2020. All rights reserved. No part of this do ument
may be photo opied, reprodu ed, or translated to another language without the prior
written onsent.
Disclaimer
The information ontained in this do ument is subje t to hange without noti e.
Hagerman Audio Labs shall not be liable for errors ontained herein or for onsequential
damages in onne tion with the furnishing, performan e, or use of this material.
Warranty
Hagerman Audio Labs warrants this produ t free of defe ts in materials and
workmanship for a period of 10 years (tubes 90 days). If you dis over a defe t,
Hagerman Audio Labs will, at its option, repair or repla e the produ t at no harge to
you provided you return it during the warranty period, transportation harges prepaid
to Hagerman Audio Labs. This warranty does not apply if the produ t has been damaged
by negligen e, a ident, abuse or misuse or misappli ation, has been damaged be ause
it has been improperly onne ted to other equipment or has been modified without the
express written permission of Hagerman Audio Labs. This warranty is limited to the
repla ement or repair of this produ t and not to damage to equipment of other
manufa turers. Any appli able implied warranties, in luding warranty of
mer hantability, are limited in duration to a period of the express warranty as provided
herein beginning with the original date of pur hase and no warranties, whether express
or implied shall apply to the produ t thereafter. Under no ir umstan es shall
Hagerman Audio Labs be liable for any loss, dire t, indire t, in idental, spe ial, or
onsequential damage arising out of or in onne tion with the use of this produ t.
Hagerman Audio Labs
PO Box 61911
Honolulu, HI 96839
808-383-2704
www.haglabs. om

TRUMPET MC Phonostage
3
Description
The Trumpet MC is a world- lass phonostage suitable for the most demanding of
audiophiles. This 3rd generation model maintains the superb soni performan e of the
original, while leverly utting osts via te hnologi al advan ements. The ir uit remains
fully balan ed from input to output, in luding power supply. Equalization is split-passive
with no feedba k employed anywhere, resulting in a neutral non-fatiguing soni
presentation. Heaters are DC and a highly spe ialized internal low-noise boost onverter
generates B+ and B- rails (after a 40-se ond delay). A novel differential JFET front-end
provides variable gain and loading apabilities needed for MC operation. With this
flexibility any artridge an be used, even MM. Premium omponents are used
throughout, su h as polypropylene apa itors and metal film resistors. The aluminum
hassis has a rugged powder oat, and is designed to mat h the Tuba.
Specifications
Item Specification
Resistive Loading 47, 100, 220, 470, 1k, 47k
Capa itive Loading 220pF
Gain 45dB, 55dB, 60dB, 64dB, 68dB
Bandwidth 10Hz to 50kHz
Noise 70dBA ref 0.5mV (93dBA ref full signal)
Distortion 0.04% @ 3Vrms
Output 22Vrms @ 1% distortion
Equalization +/-0.5dB
Tube Compliment 12AX7 x 4, 12AU7 x 2
Weight 3 lbs
Size 6 x 10 x 3.5 in hes
Power 15Vd @ 2.05A (in luded)

TRUMPET MC Phonostage
4
Tubes
Install tubes into positions as shown (12AU7 towards rear).

TRUMPET MC Phonostage
5
peration
The Trumpet MC onne ts as any other phonostage, between artridge and stereo
re eiver (linestage). There is only one set of RCA inputs and outputs.
Make sure turntable ground wire (if it has one) onne ts to ground lug on rear. Conne t
inputs and outputs. Keep hassis away from sour es of disruptive noise, su h as power
transformers within other equipment. Plug in wall-wart supply.
Unit is powered on by pressing front panel pushbutton. After roughly 40 se onds of
delay, the internal high voltage supplies will turn on. When both LEDs are lit, unit is
ready for use.
Best operation is to run LOADING as high as possible ( lo kwise) and GAIN as low as
possible ( ounter- lo kwise). MM artridges will only fun tion properly with LOADING
set to 47k and gain at 45dB.
Not all va uum tubes are mat hed for gain. If you experien e a hannel gain imbalan e,
try swapping positions of the 12AX7 tubes around to find a better mat h.

J1
C2 470uF
L1 50uH
C1 47nF
R3 16R
D2 MUR140
Q1 PFET
R1 6k8
R2 47
D1 LED S1 H1
12V
C3 470uF
+15V
R4 16R H2 12V
C4 470uF
R5 16R H3 12V
C5 470uF
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

D3 MUR140
L3 50uH Q3 IXFP
C13 470nF
C10 470uF
C12 470uF
+230V
L4 50uH
D4 MUR140
C15 470nF
-200V
54
3 6
2 7
U2 TC4428
R12 1k
R13 10k
Q4 IXTP
OUT
8
3
1
SENS
6 4 2 5
ENAB TRIG BIAS
7CLMP
U1 LM555
R10 5k6 R9 5k6 C7 1nF
C6 47uF R7 220k R6 220k
Q2 2N3906
R8 1k
R11 1k
C9 1nF
C11 47nF
C14 47nF
L2 50uH
+15V
R15 220
R16 220
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
67kHz
2.6A
2.6A

C16 33uF
D6 1N4738
C18 470nF
D7 LED
C17 33uF
C19 470nF
R17 1k R18 1k
C20 33uF
C22 470nF
C21 33uF
C23 470nF
R20 130k
C25 470uF
C27 47nF
R22 130k
R24 130k
R26 130k
D5 1N4738
C24 470uF
C26 47nF
R19 130k
R21 130k
R23 130k
R25 130k
-200V -190V
+230V +220V
-10V
+10V
D8 LED
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839

R27
J2
Q5A LSK389
X64
LSK389
R30 10k
R33 10k
R31
R29 4k7
R32 4k7 C28
47nF
PRE+
+10V
-10V
C29 47nF
PRE-
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
47 100 220 470 1k
47 220 1k6 4k7
47k
470

V1A 12AX7
R35 470k
R37 130k
V1B
12AX7
R53 470k
R51 130k
PRE-
C33 47nF
R45 6k8
C31 47nF
C34 47nF
-190V
V2A 12AX7
R38 470k
R40 130k
V2B
12AX7
R50 470k
R47 130k
R41 130k
R48 130k
C32 1nF
R43 3k3
V3A 12AU7
R56 470
R58 130k
C35 470nF
R59 470k
J3
+230V
R57 130k
-200V
PRE+
V3B 12AU7
+220V
Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839
120V
10Hz - 50kHz 2.5kohm