http://www.wmsinc.org/N7EBG/heathkitpdf/HW-101%20Manual%20KB2LJL.pdf
http://www.wmsinc.org/N7EBG/heathkitpdf/HW-101_MANUAL.pdf
http://www.wmsinc.org/N7EBG/heathkitpdf/Improve_Your_HW101or_SB100_Rig.pdf
https://www.nostalgickitscentral.com/heath/73-index/articles/HW101%20Offset-3-85.pdf
https://www.nostalgickitscentral.com/heath/73-index/articles/101%20Control%20Mod-8-84.pdf
http://www.w7ekb.com/glowbugs/ModsEtc/Optimizing%20the%20HW101.pdf
http://k3jls.net/DFD_2.html#design
http://electronicsandbooks.com/eab2/index.htm
Heathkit SB-101 schematic
http://www.heathkit.nu/SB-101_schematic_6000.jpg
LMO schematic
https://forums.qrz.com/index.php?attachments/lmo-schematic-1-jpeg.164315/
http://www.radiomanual.info/schemi/Surplus_Radioamateur/Heathkit_HW-101_review_2007.pdf
Heathkit RIT Control
http://www.wmsinc.org/N7EBG/heathkitpdf/HW101%20RIT.pdf
MFJ tuner
http://www.trinityos.com/HAM/MFJ969-repair/index-mfj969repair.html
heathkit sb-200
http://www.crompton.com/hamradio/heath/sb200/sb-200.jpg
http://www.crompton.com/hamradio/heath/sb200/heathkit_sb200_manual.pdf
http://www.crompton.com/hamradio/heath/sb200/heath_linear_qst_index.txt
http://www.crompton.com/hamradio/heath/sb200/SB-200_schematic_WA3DSP_modifications.pdf
http://www.crompton.com/hamradio/heath/sb200/sb200.html
icom
ic ps-35 manual