Ampeg v 4br schematics

Page 1

1
TEST POI NT DATA
TAKING THESE MEASUREMENTS IS DANGEROUS!!!
QUALIFIED TECHNICIANS ONLY
ALL MEASUREMENTS ARE IN REFERENCE TO CHASSIS GROUND
WAVEFORM DATA POWER SUPPLY DATA
JDOmVrmS )kHz SINE WAVE, UdB IN NO INVUY 17 77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 I
ALL CONTROLS AT EENTER ALL CONTROLS AT CENYER 1 1
ROCKER SWITCHES LEFT ROCKER SWITCHES lEFT 1 1
ALL MEASUREMENTS ARE VAC RMS ALL MEASUREMENTS ARE vDC I m ULTRA LO BREAKOFF ROCKER BOARD 1
1 a 1 1195 1 ULTRA H1 MIDRANGE SELECT 1
I R95 C45 M 1 $471! E»! SW: E1 W I
I 330K 1W .nnATuF muv OJ _ 04 I
1 .199 1
1 1w DR S N m 1
1 1 Sm 1w a a R 1
1 mm; m 1192 csz 1 77777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 1 , _ - 1
1 .40 1 H1 N m A. w 1
1 E Moszauv 1m 1w SGDF zauv 1 TREBLE BASS a 1 g g 3 Ta 1
I I S 9 m2 MI DRANGE MASTER I
I H N. "1 5' v. I 4117 1
1 2 z a A $2 1 111411 1" NW om 1m 2m 1w 1
L: .1. m 3 1 1. 1
1 1 1 1 a L. 1
1 R R " , a P2 1w 1
1 1 1 _ _ C50 g m A m LSSLIEIQOW c111 1
1 B1AS 1 WK... 1 BREAKOFF WWI muv W 111 $111 1 121
TP11 1 130 1 Ammwum I GAIN R104 m Rm] 1 POWER AMP IN
EEEEEEEEEEE 1 E0 BOARD IF 1 , ,
1 1 1 W 1w 1, W W 22? III: 1
1 1 1 H 1
I E 5 E E E 47 W I
1 _ _ - - 1 E
] PREAMP OUT

F g g? PM ] POWER AMP IN
on n N TLD72CN
Iiifii777"",VEHHHHWHHHHET g Q g 3 ,
1 INPUT BOARD I S E x E m .831 11 .1 150 25w 5 II A7
1 1 $ 2 1 I 1 mm "1
1 27 1 x x A 34141 P
1 1 VG: 1 § g Z S A
1 DUE INPuT I (43 C1319 S H C] +6dB T l7
I 1 I I 1 I I s_ x g 0 IP-< +
1 LE: 1 0 M1 5qu u M 5301] 1, E 1151 C3] V215 m 0.68% t mar SUV E ARV SLAVE
I J25 12973 1 1157} R74 5 C K E 100K 1w BM: smv -| ECCBZS Am E W E: s 2 A
1 S m o N
I 715:; INPUT M 1 100K 1w _ E E _ g ' 5 E N S
I Q 12972 1 JISEZ R73 _1 v) a m u M 53W 5:» (125 K i 5 D 11175
1 g I m 1w ; (-1 253131;; _ .1 :42 1 1 5 mm a
1 129.1 1 1157) m - .- m z > WSW g A 17 ~
1 . 1 g M 5112 mm Aoov WE L. E s " » ' 5
L ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, I E , 5 m E 571 2 m r: g - 1 LENS II 2 a
m 3 S4 m 7 s
5 1 a g g S S BALANCED OUT
~ S E m E 10K 2va
E m S
X K 2 LENS
~ GROUND LIFT
2035055701
PC H RES ma we MAIN
SCH] D zazsustxx APPROVALS DATE
SCHEMATIC PCB ASSY VEAB MAIN DRAWN / '
Dawn "and 7/1/2013 7 LOUD Technologles Inc.
CHECKED \ 1' 1 1622n WOOD-RED Rn NE WOODINVILLE1WA 95012
: COMPONENTS NOTED WITH THIS SYMBOL NPENF
SHALL BE REPLACED ONLY BY THE 1mm V-4BR MAI N
COMPONENT SPECIFIED. THIS IS REQUIRED
© 2013 LOUD TECHNOLOGIES INC.
TO MAINTAIN PRODUCT SAFETY. ALL R1GHTS RESERVED MES PREAMP
THE INFORMATION CONTAINED HEREIN mm s1ZE SCALE DWG 0 EV
IS PROPRIETARY AND CONFIDENTIAL 155 D NONE 2038054'XX 301
PROPERTY OF LOUD TECHNOLOGIES INC. DWG FILE 203230547er sch ISHEET 1 or 3

8 7 6 5 4 3 2 I 1

Page 2

8 7 6 5 4 3 2 l
\J
2]
mauve
s
V b C
sLsGC 3 g
3 OUTPUT
" TRANSFORMER
F C 2 w;
E A {2] CON D 1 BROWN LD #1 VIOLET LD #4

PLATE7V57V6 Em- C 0 BOHM
E
h D 3 m m m \J
1» K E
5 ® SECONDARY
E X f R20 [2,3] [2] l
3 C25 ( a ALDHM / 49 [OHM
I I 470 SW Tm ma
0 lUF aaav 47K 1w [3] GONG D 2 RED LD #2 I2]
,, 5 /L WA A \ , ZioHM \ h
a D m G 6 fl mmw Inn 11074
8 33 as sLeGC 1
v4 5
m ;
OJSUF 400V ECCEZ fl " ORANGE LD #6
s - x 1
E 6 E
E a 5 J
5 Q
m m fl: W E " [ 1 5" \ 0,3 ELUE LD #3 BLACK LD #7
H _ BIAS , % PLATE V7 V5 COMMON
Kb uoaTUF 400v ta Eccaas MD ' '
x n_ 5 m
D) var/A m m
powgumuw > E % 5
-' ECCSBS g i: g
_ N m g .T K .1 E
g a a a A (25 M VA A g a T
019 Dza g , TS) E s '% mm um 12; W 7
mm 1M) x g P P IN 40w _, EC? var/I R a OHM
; a M j
g " ma 5 m @ laHz E sLeGC S T
T 5 a :T
- 5 I I a m I:
MD MP APNP DJUF Aaav 47K 1w 470 SW T
4 om - ,
m 5 q] I21 43V
5 2 .4 :ER-A 4 OHM
2 as S L
t u: ,_ mm 5
E g g g I 5 IN T ,
a 0mm fl 2 > w 5 m R 4 OHM
, R § 2 a j
S 5 s g s '
Tu W s 3 :3 )4
a M E
_ sLeGC 2 WM T
mg mu 3 , m Ev
BIAS INSTRUCTION: a :3. WM
S
1) CONNECT LOAD TO AMPLIFIER [2] Z T ,5
magma
2) TURN R16 (BIAS ADJUSTMENT POT) FULLY CCW (MINIMUM SETTING) C r
KP : 4S 7
3) TURN MASTER CONTROL FULLY CCW (MINIMUM SETTING) R 2 OHM
4) TURN POWER SWITCH TO ON AND WAIT 2 MINUTES :3;
IS
5) TURN STANDBY SWITCH ON m M
6) ENSURE THERE IS NOTHING PLUGGED INTO INPUT CHANNELS
7) WAIT 10 MINUTES W
a) MEASURE VDC ACROSS R12, THE CATHODE RESISTOR OF v5
9) ADJUST R16 UNTIL YOU MEASURE 450mVDC ACROSS R12
10) MEASURE VDC ACROSS R13 (vs). SHOULD FALL BETWEEN 400vac - 500mVDC APPROVALS mg
11) REPEAT STEP #10 FOR R14 (v3) THEN R15 (v7) DRAWN 3" PM" W20 LOUD TeChn°I°9ies 'c'
V CHECKED 16220 WOOD-RED RD NE WOODINVILLE, WA 93072
12) ALL MEASUREMENTS FOR vs, vs, vs, AND v7 SHOULD BE WITHIN 400mVDC -500mVDC MW
12A) IF #12 IS TRUE, ENJOY 100w op v.43 COMPONENTS NOTED WITH THIS SYMBOL V-4BR MA| N
12B) IF #12 IS FALSE, THE TUBES ARE NOT PROPERLY MATCHED FOR YOUR PRECIOUS V-4B, SO GET NEW ONES SHALL BE REPLACED ONLY BY THE © 2013 LOUD TECHNOLOGIES INC WEN
COMPONENT SPECIFIED. THIS IS REQUIRED ' W5 POWER AMP
T0 MA' T N PRODUCT SAFE fihéTkiBEiIiififivfln. NED Hem w
we ENG SCALE
IS PROPRIETARY AND CONFIDENTIAL D NONE 2038054'XX 301
PROPERTY OF LOUD TECHNOLOGIES INC. 5 we ms 20330547)er 5m Tansy 2 a; 3

3

2

I 1