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A |
B |
C |
D |
E |
F |
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-50V |
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+50V |
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D14 |
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D11 |
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1N914 |
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1N914 |
R52 |
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R45 |
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75V PIV |
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75V PIV |
680 |
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680 |
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D13 |
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D17 |
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1 |
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R48 |
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1N914 |
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1N914 |
R47 |
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75V PIV |
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75V PIV |
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3.3K |
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3.3K |
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1/2W |
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OC1 |
1/2W |
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VTL-5C7 |
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2 |
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2 |
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S |
D |
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Q10 |
R59 |
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G |
J112 |
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200V |
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C44 |
1M |
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33 pF |
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1 |
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C35 |
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50V |
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R60 |
2 |
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R38 |
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47K |
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C31 |
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1K |
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R46 |
D |
S |
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PAGE_NEXT_A |
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10K |
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2 U3:A |
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10 |
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Q9 |
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1 |
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35V |
3 |
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J112 G |
NE5532 |
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TP12 |
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-16VA |
R7 |
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2 |
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800mVRMS |
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270K |
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HPGS_A |
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1/4W |
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5per |
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2
J29 |
1 |
+16VA |
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2 |
-16VA |
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3 |
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4
5 PAGE_NEXT_A
6
7 HPGS_A
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8 |
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TO J31 |
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2 |
SEE SHT 3 |
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PRE AMP |
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3
CAUTION:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL. TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
4
NOTES:
1) CAUTION: SHOCK HAZARD!!
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE TOUCHING INTERNAL PARTS.
2)UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL. CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL.
3)VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE AND 10 MEGOHM DIGITAL VOLTMETER.
A |
B |
BA-115HPT
+50V
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D20 |
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1 |
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1N914 |
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75V PIV |
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R74 |
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R67 |
D8 |
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.33 |
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R75 |
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+16VA |
270 |
1N4740 |
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10W |
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.33 |
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10V |
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10W |
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R55 |
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R57 |
S |
Q4 |
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1K |
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G |
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47 |
IRFP-9140R |
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-16VA |
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C46 |
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D |
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10 |
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Q7 |
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R71 |
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S |
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MJE-340 |
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G |
Q11 |
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2 |
35V |
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47 |
IRFP-9140R |
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R41 |
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D |
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200V |
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220 |
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33 pF |
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C23 |
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R39 |
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TP11 |
26.3VRMS |
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3.3 |
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R51 |
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1W |
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L1 |
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33K |
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C26 |
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.5 uH |
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.1 |
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7 |
TP10 2.0VRMS |
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100V |
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R65 |
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J3 |
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5 |
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6 U3:B |
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R43 |
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2 |
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1 |
2 |
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220 |
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1 |
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NE5532 |
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2 |
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R50 |
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1W |
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C34 |
4.7K |
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330 pF |
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2 |
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Q3 |
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R64 100V |
R63 |
|
MPS-A06 |
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D |
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47 |
330 |
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R56 |
G |
Q5 |
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2 |
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IRFP-140R |
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Q6 |
47 |
S |
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50V |
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MJE-350 |
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AP1 |
1 |
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C29 |
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D |
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BIAS AJUST |
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R70 |
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500 |
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2 |
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G |
Q8 |
||
CW |
BIAS |
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IRFP-140R |
|
SEE NOTE. |
|
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|
47 |
|
S |
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D9 |
|
||
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R42 |
|
R58 |
1N914 |
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75V PIV |
|
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||
|
1K |
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270 |
|
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D10 |
R72 |
R73 |
|
1N4740 |
.33 |
.33 |
-16VA |
10V |
10W |
10W |
|
-50V |
|
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3
|
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|
0 |
03/23/06 |
CONTROL ISSUE |
|
WFB |
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D |
2-15-06 |
ADDED R7 |
R01852 |
RLB |
|
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C |
2-2-06 |
CHANGED J14 TO J19 ON WIRING DIAGRAM |
R01846 |
RLB |
||
|
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B |
01/04/06 |
CHG C55 P/N, DEL |
R01838 |
WFB |
||
DNP NOTES |
||||||
NOTE: SET BIAS VOLTAGE FROM COLD START |
|
A 12-29-05 INITIAL ISSUE |
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|
||
ACROSS R72 - R75 , 15 -20 mV DC |
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|||
AVERAGE , NO SIGNAL, NO LOAD. |
|
REV |
Date |
DESCRIPTION |
Ecr(s)/Ecn(s) |
Chgd By |
Appvd by |
Date |
|
|||
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||||||||||
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|
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO |
|
|
||||||
|
|
|
|
|
|
|
ST. LOUIS MUSIC, INC |
|
|
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|
Signatures: |
|
|
Date: |
|
|
|
|
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|
|
Drawn: |
|
RLB |
|
5-9-05 |
1901 Congressional, St. Louis, MO 63146 |
4 |
||||
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|
||||
TEST POINT CONDITIONS NOTE : |
|
Checked: |
|
|
|
|
First Used On: |
|
|
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|
|
1 KHz INPUT SINEWAVE 170mV @ 0 dB |
|
Released: |
|
|
|
|
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|
|
INPUT JACK. 120VAC LINE, VOLUME & LEVEL @ "10" |
|
|
|
Drawing Size: |
C |
Drawing Title: |
|
|
|
|
||
TONES @ "5" , DC VOLTAGES WITH N0 SIGNAL APPLIED. |
|
Plot Date: Thu Mar 23, 2006 |
|
BASS AMP |
|
|||||||
|
|
Plot Time: |
Drawing Type: Schematic |
|
|
|
||||||
|
|
Tolerance: |
Class Code: |
NONE |
Drawing Number: |
|
07S697 |
|
||||
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Sheet |
1 |
of |
3 |
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||||
C |
D |
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E |
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F |
|
|
©2007 LOUD Technologies Inc. All rights reserved |
|
|
Bass Amplifier PCB Schematics |
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PAGE 1 |
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