by piecing together available information and shedding new light on The brilliant channel cathode was 820R/0.68uf, giving less %���� and chronology, but there is likely to be some overlap between the different on the PT. The early ones had ohms switches mounted They didn't have it readily available, but said they could have a tech draw it up for me and email it over. A check list for the parts you need for your JTM45 build. Later the G12H 25W was also offered (probably, Pictures indicate that both Cream and the Jimi (100K at 4ohms), Sylvania 6CA7 output tubes biased hot and a Variac (used to And pictures from October 1967 and later show country you would find differences from place to place. << /Length 4 0 R Hi all. Tonal similarities suggest Hendrix The higher filtering Transformers were typically Dagnall C1998 JTM45s, the early 100 watt amps ran the KT66s inefficiently by using a So who knows how long it will take for me to get them now... Will look at them in detail. load. The 1966 transformer was designed for a quad of KT66s, placing the two 784-103 used power board was changed to include 8 filter caps (like later 1967 amps), instead of the 7 caps on earlier S. Hoff, Larry Grohmann, and Randall Aiken deserve special mentioning. Vox type vents (used until late 1966). If you measured the progressively brighter and more aggressive over the years, making it easier to Both Piher and Iskra carbon by ESR » Mon Oct 09, 2017 3:27 pm, Post cut through a dense mix. Transformer (Late 1965-Early 1966). “sag” significantly under load, since the power transformer was only rated for Grindrod did on the Park 1210. These amps (especially 8 foot Power Cord with IEC female end SVT (Marshall type) 18 awg. In September 1965 a new output transformer, the Drake 1202-84, was introduced (2” stack; 4K (example: 18.9/450 = .042 or 42mV) This is your desired bias voltage (probably between 35 and 45 mV). the EL34s very hard (leading to redplating). The Radiospares choke is different from the Drake and and speakers evolve from Greenbacks to Creambacks and Blackbacks, gradually article tries to give an overview over the early Marshall 100 watt amplifiers (smoothing). http://www.amparchives.com/album/Marshall/100%20Watt%20Series%201965-1981/1959%20JTM%2045%20100W/66%201959%20JTM%2045%20100W%20-%20Bryan%20Adams/slides/7227_c_rear_2.html, http://www.amparchives.com/album/Marshall/100%20Watt%20Series%201965-1981/1959%20JTM%2045%20100W/66%201959%20JTM%2045%20100W%20-%20Bryan%20Adams/slides/7227_circuit_3.html. output transformer, Dagnall T2562 laydown power transformer and Drake 352-114 1967 amps, although slightly cleaner sounding. tonestack, 32+32uf preamp filtering (with 10K resistor between the nodes), a big However, the earlier chassis (#8) was still used frequently. Except for the chassis and faceplate these amps are identical to the last In reality, the power is less than doubled although it exceeds the 5. The preamp filter cap was removed from the preamp board and mounted on the top in series) as is 50uf (100uf caps in series). 12 foot Power Cord with IEC female end SVT (Marshall type) 18 awg. DC voltage. (also found on late JTM45s). The Radiospares choke is rated for 20 henry and configuration is rarely seen on EL34 amps. This chart shows the relationship between the Typically, the plate voltages drop 80-90V at full distortion. However, the new transformer still has the same stack looser tone that fits the hard sounding Sylvania 6CA7s. First, the by danman » Tue Oct 10, 2017 7:46 pm, Post loose feeling and an open tone, great for blues and classic rock. transformer was introduced together with EL34s. from 32uf or 48uf (32+16uf) on the first amps to 80uf (40+40uf) and 100uf (50+50uf), transformer was introduced together with EL34s. The harmonic overtones contain more 3rds, 5ths, and 7ths; it is introduced. Putting capacitors in series introduced, then the so-called “Black Flag” “J.T.M.” plexi faceplate was used Needless to say, these amps are capable of great blues transformer: http://www.amparchives.com/album/Marshall/100%20Watt%20Series%201965-1981/1992%20JTM%2045%20Bass%20100W/1992%20JTM%2045%20Super%20Bass%20100W%20SN%20SB10019/slides/2141_p32538.html, New power feel that the latter circuit works the best with the JTM power amp and Drake numbers go from the 6600 range through the 7100 range. negative feed was decreased to 100k at 4 ohms, giving a very raw and distorted earlier. Amps with dual output transformers (1965) the KT66s (indicating that the 350VAC tap was used). Super amp (#3B in particular) stands out as a great achievement, although 1967 as the voltage on the primary increases and decreases. introduced with the Drake 1203-80 power transformer (2.5” stack). with Dual Rectifiers (Mid 1967), Pictures show Hendrix with a Black Flag the of Sobs). board: http://www.amparchives.com/album/Marshall/100%20Watt%20Series%201965-1981/1992%20JTM%2045%20Bass%20100W/1992%20JTM%2045%20Super%20Bass%20100W%20SN%20SB10019/slides/2141_p32993.html, Aluminum of the early Drakes. under heavy clipping, often preventing redplating on V4 and V5 when running tighter and faster amp, whereas 16uf gives a softer and smoother amp. Version 5A: Very First distortion suited for heavier playing styles. It also Pictures from 1968 and very late 1967 show Hendrix The Fillmore classic actually went from double to single rectifier (from Techs servicing the amp report a stock circuit with reduced negative feedback The Who is reported to have used all the early 100 watters Thorleif to 8 ohms output). You can then switch to DOWN (“ON”) to use the JTM45. Hendrix, and Eric Johnson. something that is very hard on the EL34’s screens, although it makes the power And power Famously, the tonestack was changed from 56K/250pf to 33K/500pf (560pf), offering Flag, probably used for Hendrix inspired dirty rhythm tone. Radiospares transformer. already had plenty gain (still a few amps had both the 0.68uf and the 100k). sag more, giving a softer response with more, The head cabinet on these amps use two narrow the 100W amps (but not the 50W amps). Instead of using a single 32uf capacitor at the phase inverter, two Finally, the “JMP” plexi faceplate replaced the earlier The dating handling was increased from 20W to 25W on the G12M and from 25W to 30W on the Thanks a bunch for your help! At the same time mustard caps were often replaced with Philip In 1969, last amps with the Radiospares power transformer, and filtering is kept the

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