DOWNLOAD: SoundWRkShp_1280
The most (perhaps) crucial things to glean from this original document: the 1280 came in two different EQ configurations: 3-band fixed frequency, or three-band quasi-parametric (5 frequencies per band). The latter is designated 1280-BEQ. Also: there was a meter bridge option. Also: the 1280A seems to be transformerless, while the 1280B has the input transformers, thereby providing 2db more gain per channel; the document is a little vague on this point, tho, so PLEASE correct me if you know better.
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I’ve got a 1280B that I like very much. Mine has some dead channels, and could use some love, but the “Super EQ” is nifty, and the sound of the preamps is thick and useful for rock drums. The console’s a bear to work on, so I haven’t torn into it, but I will on a high confidence day. I bought a new power supply, which is said to help reduce noise. Some folks upgrade the IC chips inside, and recap them.