See the Marshall Amps DBS 7200 page for more "official" information on these DBS 7200 amps. It was the bass model of the 2078. The VS112 was fitted with a Celestion 12" Gold Back 8Ω 80W speaker. The VS265 was fitted with an EI ECC83 tube and two Eminence 12" Marshall Gold Back 8Ω speakers.
var path = 'hr' + 'ef' + '='; This amp was in production from 1995 to 1997. See the Marshall Amps DBS combo's page for more "official" information on these DBS combo amps. Pre amp PCB schematic, JTM3-60-02 Issue 4, (Marshall, 1995). DSL50 PSU & reverb circuit diagram, DL50-63-02 Issue 3, (Marshall, 1997). The nineties (1990 - 1999) was the era of the JCM900's and the reissues.
It was fitted with an Celestion Sidewinder S12-150 8Ω 150W speaker.
Thanx to Christoph Arndt. The JCM900s are split between two main product ranges: the SL-X and the Dual Reverbs. The 9004 was in production from 1990 upto 1993. Power-amp & PSU circuit, 8280-63-02 Issue 4, (Marshall, 1994). This was the head version of the 5522 combo. To celebrate 25 years of Marshall amps and for Jim Marshall being in rock 'n roll for 50 years, the Silver Jubilee amps were introduced in 1987. It was the bass version of the 2098 head. This two piece setup, the head and cabinet, were sold together as Model 2041. This combo was probably introduced in 1984. Power amp & PSU schematic, 78614-3 (Marshall, 1978). DSL rear output circuit diagram, JCM2-62-00 Issue 1, (Marshall, 1997). These 1960AV style cabinets were fitted with four Celestion T3896 G12 Vintage speakers. Amp schematic with 3x ECC83 & 2x 6550 (Unicord, 1976). Figure 4f: JCM800 2210 Treble Filter Circuit Model. document.write( '' );
These amps use 4x ECC83 and 4x EL34 tubes. Figure 1a shows the tone stack circuit. The JCM2000 TSL (Triple channel Super Lead) amps were (probably) introduced early 2000. document.write( 'span>' ); Pre amp schematic, Issue 5 (Marshall, 1994). These cabinets originally were fitted with 4 special design 12" Goodman speakers. It is said that no more than 500 of these were built. It was originally fitted with a Celestion G12-65 15Ω speaker. These particular component values are used in both the JCM800 2203 and the JCM800 2204, as well as the JCM900 2500 Master Volume. The 3203 Artist was introduced in 1984 and discontinued in 1991. Amp schematic with 3x ECC83 & 2x EL34, 70-23-11 (Unicord, 1970). These values widely differ from the previous stacks we’ve seen, and simulating with these values indicates that, generally, the bass and treble frequencies are accentuated with a dip in the low-mids (Figure 6b). These open back cabinets were part of the 3310 package. These G12-20 speakers were 'M' magnet speakers with an H1777 cone.
These cabinets were in production from 1984 up to 1991. It was an all transistor Master Volume amp. Power amp schematic with 1x ECC83 & 2x EL34, 2500-60-34 Issue 13, (Marshall, 1995).
To celebrate 30 years of Marshall amps the 30th Anniversary amps were introduced in 1992 (and discontinued in 1998). They were probably fitted with 4 Celestion Vintage 30 16Ω speakers.
Power amp and PSU schematic with 1x ECC83 & 2x 5881, 87X-60-02 Issue 6, 2of2 (Marshall, 1994). See the Marshall Arts VBA400 page for more information on the VBA400 amp. See the Marshall Amps JCM900 page for more "official" information on the JCM900 SL-X amps. 4150 Pre amp schematic, 79524 (Marshall, 1979). They came in two flavors: High Gain Master Volume and High Gain Dual Reverb.
Locate the 22K Midrange knob (VR4) and replace it with a 50K Liner or Log pot. Power amp schematic with 1x ECC83 & 4x 5881, 4100-60-02 2of2 Issue 11 (Marshall, 1994). In the first half of 1967 the JTM panels were dropped all together and the JMP panels were introduced. The 1992 standard edition amps were produced in blue vinyl. They were seamlessly integrated into the JCM800 program in 1981, be it only for shortly. This cabinet was in production from 1984 upto 1993.
They were both fitted with a Celestion G12T75 T3781 8Ω speaker. Pre amp schematic, 79119 (Marshall, 1979).
The 4101 were introduced in 1990 and discontinued in 1999. 18W amp schematic redraw with 3x ECC83, 2x EL84 & 1x EZ81. As for the change in R1’s value, the exact calculations behind this are out of the scope of this article. Amp schematic, PC0669 Issue 8 (Marshall, 1995). The power amp schematic is the same as of the 2104/2204. It is a transistorised Master Volume Split Channel MOSFET combo with reverb. This amp was in production from 1967 up to 1972. It was the tremolo version of the 1992. The type 25/50 is also a reference to this feature. It was an all transistor Master Volume amp. This cabinet was in production from 1984 upto 1993. Driver PCB schematic, 9100-60-02 Issue 6 (Marshall, 1996). These amps were fitted with either 2x EL34 or 2x 5881 output tubes. Thanx to Jelle Falk. The 2 micro stack cabinets were each fitted with one 10" speaker. Most of the 1987 models were produced in the characteristic Silver Jubilee silver/gray colors. Photograph of a DSL100 Silver Issue half stack. Power amp and PSU schematic with 1x ECC83 & 4x EL34, CD0192 Issue 1 JMP50A PCB (Marshall, 1989). The US version was fitted with an Electro Voice G200-L speaker. It was in fact 19" rack mountable, but came in a wooden 19" cabinet. These cabinets were intoduced in 1987. This amp was only shortly in production from 1972 up to 1973.
The Svetlana 6L6GC's do fit, but the JJ 6L6GC's don't. They were angled front cabinets and were fitted with four 12" Celestion G12-15 speakers, instead of the four 10" Jensen speakers in an open cabinet like Fender did. It was the active version of the 1518 cabinet. PSU and power amp schematic, Issue 2 (Marshall, 1988). Overdrive channel front control PCB circuit diagram, TL-10-61-02 Issue 4, (Marshall, 1998). Pre amp schematic part A, 7400-60-0A Issue 4, (Marshall, 1994). It was fitted with a Celestion 16Ω G15C speaker. This combo was introduced in 1984 and discontinued in 1991. document.write( 'span>' ); For the sake of consistency we’ll be using an input resistance value of 1.2k and a load resistance of 500k for all of our samples. The eighties (1981 - 1989) was the era of the JCM800's and the first anniversary amps. It was the tremolo version of the 1959. See the Marshall Arts Major page for more information on these Marshall Majors. It was fitted with a 10" Celestion G10D-25 T3535 8Ω speaker.
This is a 2x12" combo version of the 1987 head. It used the 1987 tremolo chassis in a 2x12" combo cabinet.
It was fitted with four Celestion 12" S12-150 8Ω 150W Sidewinder speakers. It was the Organ version of the 1987. These mini stack cabinets were fitted with two Celestion G12 Vintage speakers. The DSL50 amps use 4x ECC83 and 2x EL34 tubes. Hopefully this aided someone out there understand what they needed to, I plan on writing posts on more tone stack designs in the future so #StayTuned by joining the Mimmotronics Mailing List and by following Mimmotronics on the various social media platforms. This amp was in production from 1967 up to 1981. From 1970 onwards the 1982 cabinet was fitted with four Celestion G12H30 speakers. Figure 5c: Plots of JCM900 2100 SL-X Tone Stack with Bass Pot at 10% (Green), 50% (Blue) and 90% (Red). In 1967 the JMP (Jim Marshall Products) panels were introduced. Photograph of a red Marshall 1966 PA head (thanx to Jesse Petas). Pre amp schematic, Issue 1 (Marshall, 1991). See the Marshall Amps JCM900 page for more "official" information on the JCM900 amps. Thanx to Jelle Falk. The Stereo Chorus models were introduced in 1993 and discontinued in 1996.
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