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M581 PCB HISTORY
MODEL(S):-
YCV40
#
DATE
VER# DESCRIPTION OF CHANGE
1
NOV/02/00
1.00
FIRST PRODUCTION
2
NOV/08/00
.
PC#6305 R63 2K2->3K3 R40 24K->27K
3
DEC/14/00
2.00
PC#6311 ADD D16,D17,R97 AT U2
4
FEB/23/01
2.10
PC#6326 HOLE SIZE FOR C53 .070"->.047"
5
APR/30/01
3.00
PC#6419 ADD Q12,R103 R50 2M2->680K
6
.
.
R100 10R 1W->1R 1/4WFP R101 10R/1W->820R 1/4W
7
MAY/25/01
.
PC#6407 R103 680K->1M
8
JUN/21/01
4.00
PC#6420 ADD R100 220K 2W ACROSS C55
9
NOV/30/01
5.00
PC#6475 R105,R104-Q9 REPLACED BY D15,D18,D19,D20
10
.
.
D21,D22 6X 51V ZENER C60 220N->10u 450V
11
JAN/15/02
6.00
NEW SOLDERMASK FOR TABS & RCA JACKS
12
MAY/03/02
6.10
ADD ROUTING BY OUTPUT TUBES
13
MAY/27/02
6.20
PC#6537 R71 2K2->3K3 P11 20KA->100K
1
JUN/24/02
6.30
PC#6539 R106 100K->47K
2
JUL/04/02
7.00
PC#6545 MOVE X57 AND C60
3
SEP/03/02
7.10
PC#6562 R106 47K->100K D15->J76
4
MAR/17/03
8.00
MOVE AC TABS APART FOR CE COMPLIANCE
5
MAR/27/03
9.00
MOVE BREAKAWAY PCB'S TO AID ASSEMBLY
6
AUG/25/03
10.00
PC#6624 UPDATE 9 PIN TUBE SOCKETS
7
NOV/12/03
10.01
TRACE ARTWORK FIXED MANUALLY
8
DEC/03
11.00
CONVERT TO PCAD 2002
9
OCT-15-2004 .
GT:PC#6744 & 6748: APPLIED YCV50 STANDBY
10
.
.
CHANGES (SEE YCV50 V2.00 SCHEMATIC FOR DETAILS)
11
DEC-02-2004 .
GT:PC#6776 MOVED TOP MULTIPLE TO ADD ZIPPER
12
JUN-15-2005 12.00
AH, PC#6866, ADD CONNECTION PREAMP-STANDBY
13
.
.
#6933, CHANGE R78 TO 27K AND ADD TRIM POT 10K
1
.
.
PC#6965, MOVE ARC TRACE AWAY FROM TUBES
2
.
.
PC#6967, INCREASE CLEARANCES NEAR OUTPUT TUBES
3
DEC-14-2005 12.01
PC#7053:GT:R53 4850 3K9 -> 4864 2K7
4
MAY-18-2006 13.00
PC#7125:GT: J7&J8 #3914 RCA JACK->#6541. PC#7091
5
.
.
ENLARGE HOLES FOR S3-S6 #3522 FOR KINK LEADS
6
.
.
MOVED C3 FOR DEPT-59 FOR COLLISION AVOIDANCE
7
.
.
MOVED W8 TRACE AWAY FROM SCREW HOLE, MOVED
8
.
.
XC50 BREAKAWAY DOWN IN LINE WITH XC54
9
D
V
N
10
D
V
N
11
D
V
N
12
D
V
N
13
D
V
N
LEAD/PIN REFERENCE
1
6
1
IRF830
A
MJE340
2
2
5
MPSA56
3
3
NC
4
MPSA06
BC550C
4
-V
6880_PC
6884_PC
4N35
NE5532N
G2
G1
H
4
5
4
2K
C
B
E
P
NC
E
B
C
3
6
3
G
D
S
E
C
B
TO-92
TO-92
TO-220
TO-126
H
2
7
H
2G
2
1
1
8
K
2P
NC
G3
6L6GB
12AX7A
SEE LAYOUT DIAGRAM
M581 DRILL HISTORY
MODEL(S):-
YCV40
#
DATE
VER# DESCRIPTION OF CHANGE
1
D
V
N
2
D
V
N
3
D
V
N
4
D
V
N
5
D
V
N
6
D
V
N
M581 PENDING CHANGES
MODEL(S):-
YCV40
#
PC#
PENDING CHANGE
1
PC
X
2
PC
X
3
PC
X
4
PC
X
5
PC
X
6
PC
X
*PLACE IMPLEMENTED CHANGES INTO BOARD HISTORY
M581 POT LIST
YCV40 TUBE AMP
MODEL(S):-
REF
FUNCTION
PART#
KNOB
AS OF
P1
DRIVE
#4425
#8430
11/00
P2
TREBLE
#4424
#8430
11/00
P3
BASS
#4425
#8430
11/00
P4
MID
#4423
#8430
11/00
P5
MASTER
#4425
#8430
11/00
P6
MID
#4423
#8430
11/00
P7
BASS
#4425
#8430
11/00
P8
TREBLE
#4424
#8430
11/00
P9
CLEAN VOLUME
#4425
#8430
11/00
P10
PRESENCE
#4423
#8430
11/00
P11
REVERB
#4424
#8430
11/00
.
.
.
.
.
+V
8
7
COM1 COM2
B
6
NC1
NC2
5
NO1
NO2
H
3700_DRW
1P
5
6
1G
7
8
1K
9
HT
PRODUCTION NOTES
1. RTV MUST BE ADDED TO THE FOLLOWING CAPS
C1,C16,C19,C17,C70 BETWEEN C84,C28,C60,C15
BETWEEN C49,C50, ADDED TO C15,C7,C8,C3,C9
C56,C14,C6,C10,C4,C2 AND C12
2. C53 IS 22N FOR BOTH NORTH AMERICA AND CE
3. C3,C7,C6 MUST BE LOW PROFILE PT#5631
4. C8,C9 MUST BE LOW PROFILE PT#5879
3796 on this
device only.
"STYLE_P32"
Lots of goop
on the thermistor.
5. R33 #6467: APPLY THERMAL
COMPOUND GENEROUSLY
BETWEEN PART AND HEATSINK
6. BIAS 350mV ACROSS R91
AND 350mV ACROSS R92
Z352-MTG
Z352
2 of 8701
2 of 3850
2 of 8829
- to hold z352 in place
PCB
2 of 8741
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