Page 1
12AX7
16 ohm
1M
22uF
100k
1k5
Trainwreck Express
B+5
Note that mid cap
is connected to
mid pot wiper.
Version A0
500pF
Treble
100k
.022uF
.022uF
250k
Volume
Bass
250kB
Middle
25kB
1MA
820R
12AX7
220uF
B+1
2k7
100k
B+2
B+5
.001uF
poly
.001uF
ceramic
B+3
12AX7
150k
B+4
10k
B+5
100k
B+4
Presence
5kB
0.1uF
22k
0.1uF
0.1uF
47k
1M
12AX7
1M
470R
82k
100k
B+3
0.1uF
0.1uF
EL34 or 6V6
Bias
1k5
220k
220k
1k5
EL34 or 6V6
1000
B+2
8 ohm
1000
B+1
Black
120vac
Power
White
Power
Switch
2.0A SB
Fuse
Standby
Switch
160uF
350v
160uF
350v
To filaments
& pilot lamp
1k/25W
470R / 1W
220k/1W
40uF
500v
220k/1W
100uF
100v
18k2
20uF
500v
9k1
20uF
500v
Bias Adj
10kB
15k
9k1
20uF
500v
Based on designs
Bias
from Ken Fischer
Rev. 09-29-00
Page 2
12AX7
16 ohm
1M
22uF
Black
Power
Switch
100k
1k5
Note that mid pot
variable resistor.
Trainwreck Express
B+5
is wired up as a
Version A1
500pF
Treble
100k
.022uF
.022uF
250kA
Volume
Bass
250kB
Middle
25kB
1MA
820R
Standby
Switch
12AX7
22uF
B+1
~410vdc
1k/25W
2k7
B+2
B+5
18k2
100k
.001uF
B+3
12AX7
56k
9k1
B+4
10k
9k1
B+5
100k
B+4
Presence
5kB
100k
B+3
Bias
12AX7
82k
100k
.022uF
220k
220k
.022uF
0.1uF
22k
0.1uF
0.1uF
1M
1M
470R
Version One from...
"The Mystery Man"
EL34 or 6V6
1k5
1k5
EL34 or 6V6
1000
B+2
8 ohm
1000
Similar to:
Hammond
P-T1650H
B+1
120vac
Power
White
2.0A SB
Fuse
160uF
350v
160uF
350v
To filaments
& pilot lamp
220k
220k/1W
40uF
500v
220k/1W
10uF
100v
20uF
500v
15k
10uF
100v
20uF
500v
20uF
500v
47k
Bias Adj
20kB
Based on designs
Bias
from Ken Fischer
Rev.09-29-00
Page 3
Trainwreck Express
12AX7
1M
22uF
Black
120vac
Power
White
Power
Switch
2.0A SB
Fuse
100k
1k5
B+5
Version A1a
500pF
100k
.022uF
.022uF
Note that mid pot
is wired up as a
variable resistor.
Treble
1M
Bass
250kB
Middle
25kB
Volume
1MA
100pF
Standby
Switch
160uF
350v
160uF
350v
500pF
22uF
B+1
~410vdc
1k/25W
220k/1W
100k
12AX7
2k7
B+2
40uF
500v
220k/1W
B+5
18k2
.002uF
20uF
500v
B+3
12AX7
150k
B+4
9k1
20uF
500v
10k
9k1
20uF
500v
B+5
100k
B+4
Presence
5kB
100k
B+3
Bias
12AX7
0.1uF
10k
0.1uF
0.1uF
1M
1M
.022uF
82k
470R
100k
.022uF
220k
220k
1k5
1k5
Version Two from...
"The Mystery Man"
EL34 or 6V6
EL34 or 6V6
1000
B+2
8 ohm
16 ohm
1000
Similar to:
Hammond
P-T1650H
B+1
To filaments
& pilot lamp
220k
10uF
100v
15k
10uF
100v
47k
Bias Adj
20kB
Bias
Based on designs
from Ken Fischer
Rev.09-29-00
Page 4
Trainwreck Express
12AX7
1M
22uF
Black
120vac
Power
White
Power
Switch
2.0A SB
Fuse
100k
1k5
B+5
Note that mid pot
is wired up as a
variable resistor.
Version A1b
???k
500pF
100k
.022uF
.022uF
???pF
Treble
1M
Bass
250kB
Middle
25kB
Volume
1MA
Tone stack reportedly
bypassed with RC
network on some amps.
500pF
100pF
22uF
B+1
~410vdc
Standby
Switch
160uF
350v
160uF
350v
1k/25W
220k/1W
220k/1W
100k
12AX7
2k7
B+2
40uF
500v
B+5
18k2
.002uF
20uF
500v
B+3
12AX7
150k
B+4
9k1
20uF
500v
10k
9k1
20uF
500v
B+5
100k
B+4
Presence
5kB
100k
B+3
Bias
12AX7
0.1uF
10k
0.1uF
0.1uF
1M
1M
.022uF
82k
470R
100k
.022uF
220k
220k
1k5
1k5
Version Two from...
"The Mystery Man"
EL34 or 6V6
EL34 or 6V6
1000
B+2
8 ohm
16 ohm
1000
Similar to:
Hammond
P-T1650H
B+1
To filaments
& pilot lamp
220k
10uF
100v
15k
10uF
100v
47k
Bias Adj
20kB
Bias
Based on designs
from Ken Fischer
Rev.09-29-00
Page 5
12AX7
1M
22uF
100k
1k5
Trainwreck Express
B+5
Note that mid cap
is connected to
mid pot wiper.
Version A2
50pF
Treble
100k
.022uF
.022uF
1M
Volume
Bass
250kB
Middle
25kB
1MA
820R
12AX7
220uF
2k7
100k
B+5
12AX7
.001uF
56k
10k
100k
B+4
Presence
5kB
0.1uF
22k
0.1uF
0.1uF
100k
1M
12AX7
1M
470R
82k
100k
B+3
0.1uF
0.1uF
220k
220k
Bias
EL34
1k5
1k5
EL34
1k5
B+2
1k5
8 ohm
16 ohm
Output Transformer
5k primary
Black
120vac
Power
White
Power
Switch
2.0A SB
Fuse
Standby
Switch
160uF
350v
160uF
350v
To filaments
& pilot lamp
B+1
470R / 1W
1k/25W
220k
220k
40uF
500v
B+2
100uF
100v
18k2
20uF
500v
B+3
9k1
20uF
500v
Bias Adj
10kB
15k
B+4
9k1
20uF
500v
B+5
Bias
B+1
Inspired by designs
from Ken Fischer
Rev.09-29-00
Page 6
1M
12AX7
68k
22uF
B+5
100k
1k5
Note that mid cap
is connected to
mid pot wiper.
Trainwreck Express
Version A3
B+5
B+3
12AX7
33k
10k
B+4
33k
500pF
.022uF
.022uF
Treble
250k
Bass
1M
Middle
25kB
Volume
1MA
12AX7
820R
22uF
B+1
325vdc
100k
.001uF
2k7
B+2
B+5
100k
B+4
Presence
5kB
0.022uF
47k
0.1uF
0.1uF
47k
12AX7
1k
1M
1M
82k
100k
B+3
0.1uF
0.1uF
220k
220k
EL34 or 6V6
Bias
5k6
5k6
EL34 or 6V6
1500
B+2
1500
B+1
8 ohm
16 ohm
Similar to:
Hammond
P-T1650H
Black
120vac
Power
White
Power
Switch
2.0A SB
Fuse
100R
100R
Standby
Switch
100uF
350v
To filaments
& pilot lamp
1k/25W
470R / 1W
40uF
500v
100uF
100v
18k2
20uF
500v
9k1
20uF
500v
Bias Adj
10kB
15k
9k1
20uF
500v
"How's it sound? Like the first Van Halen
album..."
Bias
A DIY clone inspired by
designs from Ken Fischer
Rev.09-29-00
Page 7
1M
120vac
Power
12AX7
47k
22uF
Power
Switch
Black
White
2.0A SB
Fuse
B+5
100k
1k5
Note that mid cap
is connected to
mid pot wiper.
Trainwreck Express
Version A4
B+5
100k
500pF
.022uF
.022uF
Treble
250kA
Bass
250kB
Middle
25kB
Volume
1MA
820R
Standby
Switch
80uF
350v
80uF
350v
12AX7
22uF
B+1
1k/25W
.002uF
2k7
220k/1W
20uF
500v
220k/1W
B+2
18k2
20uF
500v
150k
.001uF
B+3
12AX7
56k
B+4
9k1
20uF
500v
10k
9k1
20uF
500v
B+5
100k
B+4
Presence
5kB
100k
EL34 or 6V6
Bias
B+3
12AX7
0.1uF
10k
0.1uF
0.1uF
1M
1M
470R
.022uF
82k
100k
.022uF
"When the guitar volume is on 10, this is
the meanest amp I own; feedback swells
into higher harmonics above the note, the
low end doesn't mush out, thick mids yet
clear top end.
When the guitar volume is rolled off,
it becomes one of the sweetest and
jangliest amps I've got."
220k
220k
1k5
1k5
EL34 or 6V6
B+2
1000
1000
B+1
390vdc (EL34)
410vdc (6V6)
16 ohm
8 ohm
Similar to:
Hammond
P-T1650H
100R
100R
To filaments
& pilot lamp
470R / 1W
100uF
100v
Bias Adj
10kB
15k
Bias
A DIY clone inspired by
designs from Ken Fischer
Rev.09-29-00
Page 8
12AX7WB
Input
Trim
1MA
22k
Sovtek
47k
1k5
20uF
The Blues Express
Version A5h
B+5
185vdc
1.49vdc
100k
poly
1uF
285vdc
100k
0.22uF
poly
50pF
mica
.022uF
418P
.022uF
418P
Treble
1MA
Volume
Bass
250kB
Middle
25kB
1MA
Sovtek
12AX7WB
100k
2k7
20uF
250pF
209vdc
1.99vdc
B+5
285vdc
1uF
poly
B+1
344vdc
(364vdc)
100k
.001uF
418P
56k
250pF
Sovtek
12AX7LPS
270vdc
2.94vdc
10k
B+2
B+3
319vdc
333vdc
(351vdc)
(337vdc)
B+4
300vdc
100k
.022uF
B+4
301vdc
(318vdc)
Sovtek
12AX7LPS
418P
20.8vdc
1M
B+5
285vdc
(301vdc)
56k
261vdc
57.8vdc
1k5
56.1vdc
56k
B+3
318vdc
270k
.022uF
418P
This is the final version of the Blues Express
amp. The zener limiting circuit was removed
and a modified cross-line MV was installed
in its place. The bias/grid load resistors were
returned to their original value of 220k.
The 2nd stage supply was rewired to B+5
instead of B+4 and the 0.22uF/630v poly cap
from B+5 to ground was drawn in.
7
.022uF
418P
0.22uF
Bias
–12.5v
Fixed Bias
MV
1MA
Switch
5k6
220k
220k
5k6
130/5w
2
10.89vdc
2
25uF
344vdc
3
3
344vdc
B+2
330vdc
9
1k
5W
1k
5W
9
330vdc
7
EL84
8 ohm
B+1
Speaker:
Jensen
P10-Q
EL84
Black
120vac
Power
White
Power
Switch
1.5A SB
Fuse
KT-17620
336vac
5 - 10v / 5w
100R
470R / 1W
4 - 1N4007
zeners
To
Fils
20-0-20vac
100uF
100v
100uF
350v
100uF
350v
Hi-V
Sw
Bias Adj
10kB
10k
1k/5W
220k
220k
–12.5v
20uF
450v
Bias
4k7
20uF
450v
9k1
20uF
450v
9k1
20uF
450v
"This amp was fine-tuned for blues tones,
with a sparkling clean sound that gets more
aggressive when you crank up the volume.
It sounds like an old BF amp on Viagra..."
Revisions from Versions 2 & 5
shown in RED
Inspired by designs
from Ken Fischer
Rev.11-13-00
Page 9
Trainwreck Express
12AX7
1M
25uF
Black
120vac
Power
White
V1A
Power
Switch
Slo-Blo
Fuse
B+4
100k
1k5
Note that mid cap
is connected to
mid pot wiper.
Version A6
250pF
Treble
100k
.022uF
.022uF
250k
Bass
250kB
Middle
25kB
Volume
1MA
Standby
Switch
100uF
350v
100uF
To filaments
& pilot lamp
100pF
25uF
~500vdc
350v
B+1
Choke
220k/1W
220k/1W
10uF
100v
B+4
220k
.0047uF
12AX7
12AX7
2k7
V1B
Can run V2B in
parallel w/V2A:
47k plate w/ 1000pF
1k cathode resistor
Can use 12AU7 for V2
B+2
B+3
10k
20uF
500v
15k
10uF
100v
20uF
500v
6k8
20uF
500v
15k
100k
V2A
B+4
2k
500pF
Bias
Bias Adj
10kB
B+4
100k
5k6
22k
EL34 or 6550
B+3
Bias
12AX7
0.0047uF
22k
1M
0.1uF
V3A
1M
470R
V3A
82k
100k
.022uF
.022uF
100k
100k
1k5
1k5
V5
EL34 or 6550
One cloner's take on
the Express design.
Based on designs
from Ken Fischer
V4
B+2
1000
1000
Similar to:
Hammond
P-T1650H
B+1
Rev.09-29-00
8 ohm
16 ohm
(Can wire up to
UL taps using 1k
screen resistors.)
Page 10
Trainwreck Express
16 ohm
1M
Black
120vac
Power
White
12AX7
V1A
68k
1uF
Power
Switch
2.0A SB
Fuse
100k
820
Note that mid cap
is connected to
B+5
mid pot wiper.
Version A7
47k
680pF
.022uF
.022uF
Treble
250k
Volume
Bass
1MA
Middle
50kB
1MA
Standby
Switch
80uF
450v
80uF
450v
B+1
~450vdc
470k
470k
470R/10W
220k/1W
220k/1W
40uF
500v
1uF
B+2
2k7
22k
10uF
500v
B+5
100k
12AX7
V1B
B+3
22k
20uF
500v
.022uF
B+4
12AX7
V2A
56k
B+5
22k
10uF
500v
100k
10k
Presence
B+4
5kB
100k
EL34
B+3
Bias
V4
12AX7
1M
V3A
1M
470R
V3A
Can add post-PI MV here
(like Matchless Spitfire)
82k
100k
.022uF
.022uF
100k
100k
1k5
1k5
V5
.001
.001
39k
0.022uF
0.68uF
EL34
Voodoo Amps
"Blue-Tone" Amp
1k5
B+2
1k5
B+1
8 ohm
Similar to:
Hammond
P-T1650H
To filaments
& pilot lamp
220k
10uF
100v
15k
10uF
100v
47k
Bias Adj
20kB
Bias
Based on designs
from Ken Fischer
Rev.09-30-00
Page 11
12AX7WB
Input
Trim
1MA
22k
Blues Express Plus
Version A8a
B+5
285vdc
Smooth Switch
22M
100k
Sovtek
12AX7WB
(364vdc)
20uF
B+1
344vdc
22M
100k
.047uF
209vdc
1.99vdc
2k7
1uF
poly
B+2
333vdc
(351vdc)
Sovtek
47k
1k5
20uF
185vdc
1.49vdc
100k
1uF
poly
100k
0.22uF
poly
50pF
mica
.022uF
418P
.022uF
418P
Treble
1MA
Volume
Bass
250kB
Middle
25kB
1MA
B+5
285vdc
100k
.0068uF
715P
Fat Switch
B+3
319vdc
(337vdc)
.0016uF
715P
180k
B+4
301vdc
(318vdc)
Sovtek
12AX7LPS
270vdc
2.94vdc
82k
10k
B+5
285vdc
(301vdc)
B+4
300vdc
100k
.022uF
418P
1M
Sovtek
12AX7LPS
261vdc
20.8vdc
57.8vdc
1k5
56.1vdc
56k
The Blues Express Plus adds a "Fat" switch to allow
for more Marshall-ish sounds by using a switchable
.0068uF coupling cap after the second stage. In
the other modes this cap is run in series through a
.0016uF cap which results in a net capacitance
of 1295pF. A center-off DPDT switch was used
to toggle the grid load of the 3rd stage from 56k
B+3
318vdc
to 82k in the two "blues" modes, while dropping
to 45k to cut the gain a bit in the "Fat" mode.
B+2
EL84
7
330vdc
9
1k
5W
1k
5W
9
330vdc
7
EL84
0.033uF
630v
0.022uF
630v
B+1
10k
10W
Conjunctive
Filter Switch
8 ohm
Speaker:
Jensen
P10-Q
56k
.022uF
270k
.022uF
418P
418P
0.22uF
Bias
–12.5v
1MA
5k6
MV
150k
150k
5k6
130/5w
Fixed Bias
Switch
344vdc
2
3
10.89vdc
3
2
344vdc
25uF
120vac
Power
Black
White
Power
Switch
1.5A SB
Fuse
KT-17620
336vac
5 - 10v / 5w
100R
470R / 1W
4 - 1N4007
zeners
To
Fils
20-0-20vac
100uF
100v
100uF
350v
100uF
350v
Bias Adj
10kB
1k/5W
220k
220k
Hi-V Switch
–12.5v
10k
Bias
20uF
450v
The switchable conjunctive filter was used to smooth
9k1
4k7
9k1
out the response of the amp, making the 250pF caps
across the 2nd and 3rd plate resistors unnecessary.
20uF
450v
20uF
450v
20uF
450v
With the .022uF and .033uF caps in series the net
capacitance is .0132uF.
The Smooth switch is a local feedback loop between
the plate and grid of the 2nd stage. The traditional
value of 22M allows for a compressed sound while
the alternate value of 44M has a more subtle effect.
Revisions from Versions 2 & 5
shown in RED
Inspired by designs
from Ken Fischer
Rev.05-03-01
Page 12
Blues Express Plus
Version A9h
B+5
285vdc
0.22uF
1uF
poly
200k
poly
100k
120vac
Power
50pF
1kV
.022uF
418P
.022uF
418P
Black
White
Treble
1MB
150k
Bass
250kB
Middle
25kB
Power
Switch
1.5A SB
Fuse
Volume
Sovtek
12AX7WB
1M
20uF
100k
185vdc
1.49vdc
1k5
Revisions from Versions 2 & 5
shown in RED
1MA
KT-17620
Bright Switch
250pF
1kV
(2 - 4M7)
270pF
820R
336vac
5 - 10v / 5w
100R
470R / 1W
12AX7WB
1kV
2k7
20uF
4 - 1N4007
zeners
20-0-20vac
Sovtek
209vdc
1.99vdc
To
Fils
100uF
100v
B+5
285vdc
100k
* Use 56k to 150k.
This will set amount
of gain & distortion.
1uF
poly
344vdc
(364vdc)
100uF
350v
100uF
350v
Bias Adj
10kB
.0015uF
715P
.005uF
418P
2200pF
1kV
B+1
1k/5W
220k
220k
Hi-V Switch
–12.5v
10k
Sovtek
12AX7LPS
68k *
B+2
333vdc
(351vdc)
4k7
20uF
20uF
450v
Bias
50pF
319vdc
(337vdc)
450v
270vdc
2.94vdc
10k
B+3
9k1
20uF
450v
B+4
300vdc
100k
1200pF
B+4
301vdc
(318vdc)
.022uF
418P
1kV
9k1
20uF
450v
(301vdc)
Sovtek
12AX7LPS
20.8vdc
1M
56k
B+5
285vdc
261vdc
57.8vdc
1k5
56.1vdc
The Blues Express Plus is a radical reworking of the
Blues Express chassis along the lines of more
traditional Trainwreck designs. The conjunctive filter
is the key to getting a smooth response from this
preamp with the output section using the stock Electar
Tube 30 OT; without the conjunctive filter the sound
would be extremely brittle and harsh.
B+3
318vdc
B+2
9
9
7
330vdc
1k
5W
1k
5W
330vdc
7
EL84
.047uF
630v
EL84
0.033uF
630v
B+1
10k
10W
Conjunctive
Filter Switch
56k
50pF
.022uF
418P
270k
0.22uF
.022uF
418P
Fixed Bias
Bias
–12.5v
Switch
MV
1MA
5k6
150k
150k
344vdc
2
3
10.89vdc
3
130/5w
2
344vdc
25uF
5k6
The 3 position Bright Switch is an important control
as it allows for chimey and clear sounds at lower
settings of the volume control. Because of the series
linkage the low capacitance setting works out to 129pF.
I like to turn up all of the controls to 10 (going through
a Marshall Power Brake when necessary) and then
fiddle with the controls on the guitar to get clean,
crunchy or downright distorted tones.
Inspired by designs
from Ken Fischer
Rev.05-20-01
8 ohm
Speaker:
Jensen
P10-Q
Page 13
Sovtek
12AX7WB
1M
1k5
20uF
185vdc
1.49vdc
100k
1uF
poly
B+5
285vdc
Blues Express Plus
Version A9k
0.22uF
poly
39pF
100k
1kV
22pF
Mica
.022uF
418P
.022uF
418P
Treble
1MB
Bass
250kB
Middle
25kB
Volume
1MA
Bright Switch
250pF
1kV
(2 - 4M7)
270pF
820R
Sovtek
12AX7WB
1kV
2k7
20uF
.0015uF
715P
209vdc
1.99vdc
1uF
poly
B+5
285vdc
68k
33k
.005uF
418P
2200pF
1kV
Gain Switch
B+1
344vdc
(364vdc)
Sovtek
12AX7LPS
56k
47k
50pF
1kV
B+2
333vdc
(351vdc)
270vdc
2.94vdc
10k
B+4
300vdc
B+3
319vdc
(337vdc)
100k
.022uF
418P
1200pF
1kV
B+4
301vdc
(318vdc)
Sovtek
12AX7LPS
Fat Switch
.01uF
418P
1M
B+5
285vdc
(301vdc)
56k
20.8vdc
261vdc
57.8vdc
1k5
56.1vdc
56k
50pF
B+3
318vdc
The Blues Express Plus is a radical reworking of the
Blues Express chassis along the lines of more
traditional Trainwreck designs. The conjunctive filter
is the key to getting a smooth response from this
output section (which doesn't use NFB). Without
the conjunctive filter the sound would be extremely
brittle and harsh. In this revision a split load is used
on the 2nd stage and a switch was added to lower
the PI input capacitance.
EL84
.022uF
418P
270k
0.22uF
.022uF
418P
Fixed Bias
Bias
–12.5v
Switch
MV
1MA
5k6
150k
150k
5k6
130/5w
(10.89vdc)
25uF
2
2
344vdc
3
B+2
3
344vdc
EL84
7
330vdc
9
1k
5W
.047uF
1k
630v
5W
9
330vdc
7
Brown
0.022uF
630v
Red
B+1
10k
10W
Blue
Conjunctive
Filter Switch
OT:
New Sensor
NSC041318
8 ohm
Green
Black
Speaker:
Jensen
P10-Q
Power
Switch
Black
120vac
Power
White
1.5A SB
Fuse
Revisions from Versions 2 & 5
shown in RED
KT-17620
336vac
5 - 10v / 5w
zeners
100R
470R / 1W
4 - 1N4007
To
Fils
20-0-20vac
100uF
100v
100uF
350v
100uF
350v
Bias Adj
10kB
1k/5W
220k
220k
Hi-V Switch
–12.5v
10k
Bias
20uF
450v
4k7
20uF
450v
9k1
20uF
450v
9k1
20uF
450v
In this version the stock OT has been replaced with
a New Sensor Deluxe OT, stock # NSC041318
This OT does not have as much problem with
oscillations as the stock OT, and the low end is
much fuller.
Inspired by designs
from Ken Fischer
Rev.07-04-01
Page 14
Page 15
Notes on WRECKXPR.PDF
Version Number: Notes
A0: This is supposed to be pretty close to a real Express. Certain rumors were added in
like the parallel coupling caps between the 2nd and 3rd stage
A1 and A1a: These came from someone who has seen the inside of a real Express... and lived
to tell about it. I suspect that A1a is more accurate than A1
A1b: Similar to A1a, but I drew in a possible RC network bypassing the tone stack that was
reportedly seen on at least one Express.
A2: This is probably based on Callaham clone and not a real Wreck. The 50pF treble cap, 1M
treble cap and .001uF/56k cap/resistor after the 2nd stage all contribute to a brighter,
less gainy sound than is produced by a real Express. (It was this schematic that was
originally distributed as the Trainwrecked Expresso.)
A3: This schematic is based on a DIY clone.
A4: This schematic is based on a different DIY clone.
A5h: This is the final version of the original lower gain Blues Express amp (which was
based on the Callaham schematic in version A2). Chimey like a Vox or BF Fender at lower
gain settings, but when cranked up it was more like the Vox.
A6: This was reportedly based on one of Allesandro's amps.
A7: This was a clone built by Voodoo Amps.
A8a: This was an early rebuild of the Blues Express after I added a conjunctive filter to
version A5h.
A9h: This is the final version of the Blues Express Plus. Note that the 47k grid stopper
on the 1st stage and the 100k grid stopper on the 2nd stage have been eliminated, and
except for the various mode switches is closer to version A2 than the earlier incarnations
of the Blues Express/Plus.
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