Ampeg pb 800 portabass preamp schematic

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E R10 / C5 0P27SGP 35V 50V _ 7 50K L 75v FIV 75v PIV E-Wr
WW % I; m R5 SGK x/Pl \ / P23 _ CW LOW i 22K
SLEEVE 22K 022 Fla _ W D21 3 3K ()1 I x x \ 7 P2 019
mov 470K 22x 1Na74aARL ERGZK sw3;A '
T CI 2:3 as p.
7 ' TI IT Ioov suv SW1 :a 200V
7 D22 7 CD" C15 R24
7 1 2J3d B IN P UT 93 i @302, maaaAEL R25 4 P W . e . WE
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answ W T 4.3:.7 F 5 E 05033 Cw
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T1P7SW GAIN 20K RA D2 m C T A7K e mov T is: (3?;
w H11 4; 1723* 17g33N + ULTRA HIGH ULTRA LOW f 50v
SLEEVE 65K T 43 R40
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E 200V CHANNEL ONE 7
CHASSIS 1 P5
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@dB INPUT \E/ EH85
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n P H73 ISOK ,/ 7 \_ 200V CW
SLEEVE 022 R71 D24 H72 3 SK L PI ,1 \ P2 , LOW HIGH
-/\/\/\/-- T
mov 57% 22K NHSAgf 23K SW4:A
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I
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100 pE IN4743ARL E 50V 022 P5:A P8:B
- 1 2d B I N P UT c3202; 13V 026 353$ T m M RA
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RING WW3 T Q mov T 5 (:50 T
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W SW T DN97M 539314 7 -ULTRA 5 ULTRA LOW 100K TLo-72 mK 50"
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CHANNEL TWO PE
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Power Table
Her Des DevTceOype) Package +14v -I5v -14v +I5v
U1 57275517 EDIF7 5 E 4
U2 357275817 SDIP73 a 4 0 2-13-04 CONTROL |ssu5 RLB
U3 37572517 ED|F7 3 4 5
U4 37572517 EDIF7 3 4 8
U5 378725! 7 EDIP7 I! 4 8 A 12/5/03 INITIAL ISSUE
U5 37572517 ED|F7 3 4 8
c AUTI ON: U7 37a7291_ amp-3 4 a REV Dale DESCRIPTION Ecr(S)/Ecn(s) (3th By Appvd by Dale
THIS SCHEMATIC IS PROVIDED FOR USE BY QUAL|F|ED PERSONNEL_ U8 3707ZBI7 EDIP7CS 4 5 THE INFORMATIONSQrQIEgfilgEV? {2:ng DHAWINC IS PROPRIETA YTO
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED U9 370729- EDP-3 4 5 ' L
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND U 379729- amp-3 " 5 Signatures: Date: &
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS. P
Draw": RLB 12'5'03 11330 Barman Drive. SI. Loui MO 63146
NOTES: Checked: Firsl Used On:
1) CAUTION: SHOCK HAZARDII Released-
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER '
¢SBCBEISE$I§TFEORYVVAEEF§AJI§T%Y '3 D'SCHARGED BEFORE Plot Date: Fri Feb 13. 2004 Drawing Size: C Drawing Title: BA PREAMP
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4w-5% TOL. A NOT USED ON DASH 01 Pk Time: HM Drawing Type: Schematic SS
CAPACITOR VALUES IN MICROFARADS, 50V»10°/o TOL. Cl C d NONE D a .n9 N mber
3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE Q USE a PIN HEADER FOR 701 . ass 0 e: r WI u :
AND 10 MEGOHM DIGITAL VOLTMETER. Tolerance. Sheet 1 of 2 073596

A I B

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@2008 L0 UD Tec hnologies Inc . All rig hts reserved

BassPrea mp PCBSchematics

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A B c D E I F
1.6V prp * 7
:"D\ PRE EAL OUT + I J30
JWOPT1 155 PRE EAL OUT , 2
POST EAL/LINE OUT + 3
LINE OUT . 4
A (CZ) Fx SENDilNPD 5
mm 6
R65 75" P'V FX SEND RING 7
650 H65
C35 650 FX RETURN a
+ PWR AMP IN + 9
I00 R67 7 PWR AMP IN . m
35V 2 2K LIMIT 1:
+I 5V
H3 LIMIT
J5 5:: I J40 PWR IN +
i 100 JiICoz H29 R45 R47 1 PWR IN .
%- Tasv M /\ /\ 2 2x 2 2K C33 + R57
50V (:32 CS C15 4,7K IoaK GND
3 I: 047 I: 047 047 .
I l Ioav Ioav Ioov , E
T Log
7, V Re T g" 5 . LIMIT
T F R32 r, U9:B MUTE
mo < > AAA,-~ ,
WK TLC-72
R33
R34 DK
IOK C15
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m0 9;
200V
D14
( P1 :1»
we
75v prv
D20
/ P2 I
we
75v PIV
D5
mm mm
75v pm 75v prv
{P1 x .1 P2}
R23
I 5K
RE: 0 2.13.04 CONTROL ISSUE RLB
x
f 3 A 12/5/03 INITIAL ISSUE
D12 X
CAUTION WHITE TEE REV Dale DESCRIPTION Ecr(S)/Ecn(s) Chgd By Appvd by DaIe
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL. POWER THE INpoammonsegtgmgm-gwmg DRAWING Is women we
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED n52
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND 4 7K Signatures: Date:
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
Drawn: RLB 125' 11330 Borman a. St. Louis. MO 63146
NOTES: V <7sz m Checked: First Used On:
1) CAUTION: SHOCK HAZARDII 0 Released-
;n'g BU;QU%%NJswsRH:UZs§EY TOUCHING INTERNAL PARTS. m Plot Date: Fri Feb 13. 2004 Drawmg Slze: C Drawlng Tllle- BASS PREAMP
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4w-5% TOL. A NOT USED ON DASH 0 2N5 F'Im Time= HMO Drawing Type: Schematic
CAPACITOR VALUES IN MICROFARADS, SUV-10% TOL. A USE 8 PIN HEADER FOR 70 . _
3))lNOEli'l1'AGMEES ARE/IIVBIEIAfiliR-EVD III-VI'I'AréIéI/IREGOHM OSCILLOSCOPE Tolerance: class Code; NONE Drawmg Number. 078596
0 G0 G 0 . Sheet 2 of 2
A I B I c I D E I F
[03' M mm @2008 LOUD TechnologIeslnc.A|| nghts reserved BassPrea mp PCBSchematIcs PAGE2