| I bought this amp from lead vocalist Michael from the Danish heavy band called Alien Force in 1990, it was in a bad shape tube vice. Price approx $375. |
| Michael Joined me in Big Time as Lead vocalist 1988-1990. |
| The amp is completly original from build in 1969 witn "plexi front", except from the Groove Tubes (Groove Tubes Power GTEL34R Quartett www.thomann.de no. 3944048 82,90 EUR) and the front Marshall logo (Accessories for Amps Marshall Logo gold, klein Logo, gold, klein www.thomann.de no.3050069 9,00 EUR), which was changed in 2007. It's more than 40 year old, but....it plays wonderfull with a power strike and bottom, that will blow you away............ |
| A "plexi" Marshall is one from around
1965 through the middle of 1969. What distinguishes "plexi" Marshalls
from others is the material that the front (and sometimes back) panel is
made from. The "plexi" panel is a plastic called "perspex" that is
clear with lettering and gold on the back surface. It is mounted to the
front of the amp chassis and becomes the front panel that the jacks and
pots are mounted to. The amps before the plexi models had either white
panels or on some, lettering was screened to the aluminum chassis.
There are some JTM45s and JTM45/100 (the first production 100 watt
heads) amps that have plexi front panels and a cream colored back
panels. Plexi does not mean see-through.
(source 20th Century Guitar
Magazine Anniversary Article By Mitch Colby |
Pictures of my amp serial SL/A 10209
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Blue print avaiable here:
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Marshall 1959 SLP Super Lead Plexi Guitar
Amplifier Head
The Marshall 1959SLP 100 Watt Super Lead Plexiglas head of the late '60s/early '70s, as used by countless classic bands, reissued in all its glory. The 1959SLP has been in production since the late sixties but with various electrical and cosmetic changes happening along the way. The models produced in the late 1960s/early 1970s however, were the ones that most tone gurus regarded as the finest examples.
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(source: www.korgnorthwest.com)
| Marshall Amplifier Date Codes |
|
The newest models are
incredibly easy to date (read on, if you aren't already aware of the
current serial numbering system) but dating older amps (pre-1993) are
slightly more involved. Here's the story so far
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July 1969 - September 1992
In July of '69, Marshall introduced their
first date code system. To determine the year of manufacture, a letter
of the alphabet was included in the serial number. Here's how it works:
A 1969/1970 C 1971
D 1972 E 1973
F 1974 G
1975 H 1976 J 1977
K 1978 L
1979 M 1980 N 1981
P 1982 R
1983 S 1984 T 1985
U 1986 V
1987 W 1988 X 1989 Y 1990 Z 1991/1992
B was skipped because A ran for 18
months and I, O and Q were also skipped because they looked too
similar to numbers.
As a rule, the serial number is usually
located on the back panel of the chassis but some amplifiers made
between 1979 - 1980 had them on the front panel. Now, at this point
you're probably wondering where exactly this letter can be found within
the serial number. That's a very good question so here's the answer.
From July 1969 to December 1983, the letter was put after the serial
number. For example, let's say you found this stamped on the back panel:
SL/A 14532 D What does it mean?
SL/A = model number
12532 = serial number D = Date code (1972) |
Fuses:
MODEL # |
AMPERAGE |
VOLTS |
SIZE |
PART# |
|
1959SLP |
HT-1A Mains-4A |
250V 250V |
20mm 20mm |
MFP20-1 MFP20-4 |
Tubes pre
RCA 12AT6
Tubes output
Groove tubes EL34 changed in 2005
Groove Tubes Power 4xGTEL34R Quartett www.thomann.de no. 3944048 82,90 EUR
This Russian made pentode is standard issue on many UK amps and has great durability, although as with most Russian power tubes the break up is a bit harsh and they lack high end as compared to the true European models.Unique sound, slightly edgy distortion when pushed hard. Newly exclusive GT design, close copy of classic Mullard type with good power and flat tonal response. The most reliable of all in this family.
