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ampage archive
Vintage threads from the first ten years
History of Marshall book
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 2/19/1998 10:54 PM |
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adam |
History of Marshall book does anyone know how accurate the schematics in the History of Marshall book are? I want to try to build a 1959 amp and was thinking of using the schematic from there |
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| 2/25/1998 10:39 AM |
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| Derrick | I have this book and use it regularly! It is great. Just make sure you use the write schmatics (ex. plexi/ealy aluminum/late seventies). Good luck...Derrick |
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| 3/7/1998 8:46 AM |
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| Brendan | The metal panel Unicord schems are right on, because I compared the 1987 "Mark II" schem to the internals on my 1974 50 watt non-master amp and they were almost exact. Some of the figures for resistance of the feedback resistor and some other cathode resistors are shown with two different values on the schem, one in parenthesis. These are to reflect the different values when using 6550 rather than EL-34 output tubes. What is really cool are the hand drawn schems showing the older versions of 'plexi' type designs, particularly the 1959T, which is I think one of the first refinements to the super lead, in that some of the 'brightening' elements have been added, but not to the same extent as with the metal panels. My guess is that this is representative of the 1968-69 plexi, perhaps even late 1967. I have never seen these anywhere else. Those schems go along way towards explaining the guts that the earlier SL's had, and notice the filter cap arrangements as well, quite different from later models. Worth the price of admission. Good luck. |
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