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Unlike some other 7000 series mainframes with switchmode PSUs, the 7844 does have a fan. | Unlike some other 7000 series mainframes with switchmode PSUs, the 7844 does have a fan. | ||
Early 7844 (SN B109999 and earlier) have issues with horizontal aberrations for sweep rates of 1 ns/Div. After discovery of the issue modification kits (040-0804-00) that replace the horizontal amplifier were offered. For more information see the [[Media:Tek 067-0657-00 with schematics.pdf|manual]] of the [[067-0657-00|067-0657-00 Normalized Ramp Generator]] that was use to investigate this issue. | |||
==Links== | ==Links== | ||
* Murlan Kaufman, [[Media:Tekscope_1974_V6_N4.pdf | ''A 400 MHz dual-beam oscilloscope.'']] Tekscope Vol.6 No.4, Sept/Oct 1974, p.3 | * Murlan Kaufman, [[Media:Tekscope_1974_V6_N4.pdf | ''A 400 MHz dual-beam oscilloscope.'']] Tekscope Vol.6 No.4, Sept/Oct 1974, p.3 | ||
* [https://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7844.html Tek 7844 page at amplifier.cd] and a [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/rep-und-kal/7844_reparatur_engl.html repair report (switch-mode PSU)] | * [https://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7844.html Tek 7844 page at amplifier.cd] and a [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/rep-und-kal/7844_reparatur_engl.html repair report (switch-mode PSU)] | ||