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-The TM503 (503A) is a 3 bay mainframe for the TM500 system.
+{{TM500 mainframe
+|mfg=Tektronix
+|type=TM503
+|function=three-bay mainframe
+|image=Tek pg501 sc502.jpg
+|introduced=1972
+|discontinued=(?)
+|designers=Gunther Engert;Roger Stenbock
+|manuals=
+'''TM503'''
+* [[Media:070-1305-00.pdf|TM503 Instruction Manual 070-1305-00]]
+* [https://w140.com/tm503.pdf TM503 Technical Manual] (US Army)
-==Manuals==
+'''TM503A'''
-* [http://w140.com/tm503.pdf Tektronix TM503 Manual (PDF)]
+* [[Media:070-6568-00.pdf|TM503A Instruction Manual 070-6568-00]]
-* [http://w140.com/smb/TM5X_RIB_FREE.pdf Tektronix TM500-Series Interface Manual (OCR, PDF)]
-* [http://w140.com/smb/TM500_Supplies_sm.pdf Suggested Power Supply Circuits for the TM500 Blank Plug-in Kit] (see also [[040-0652-05]])
-==Specifications==
+'''TM503B'''</br>
-[[Category:Specifications needed]] ''please add''
+* [[Media:070-7808-00.pdf|TM503B Instruction Manual 070-7808-00]]
+}}
+All bays are low-power. It has a single strap carrying handle on the right side.
+The '''TM503A''' moves the power switch to the rear and has a swiveling carrying handle that can also act as a stand.
+The '''TM503B''' retains the power switch position and changes the handle material to plastic. It also allows the power supply/backplane part to be removed from the case so that modules to be repaired on the bench without using extenders (see link below).  It also has openings for the [[TM5000]] GPIB feature, but not the connectors nor the power good signal for TM5000 plugins.
+{{MissingSpecs}}
+===Option 2===
+Option 2 adds internal pin headers for each slot as well as rear 50-pin and BNC connectors, allowing for custom wiring to, from and between plugins.
+On the standard TM503, cutouts for three BNC sockets have been made in the rear frame, meaning that the user only needs to drill holes in the rear cover plate to install the sockets.
+===Option 7===
+Option 7 adds barrier keys (214-1593-02) and connections on the rear interface to allow connections between a [[DC502|DC502 Opt.7]] to a [[TR502]] or [[SW503]], such that the center or marker frequency of a sweep can be read of the DC502.
+==Links==
+* See [[TM503/Repairs|Repairs page]] for video and replacement PCBs
+* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/TM503B/TM503B.html TM503B @ amplifier.cd]
+* [https://paulcarbone.com/blog/tektronix-tm-503-repair/ TM503 repair @ paulcarbone.com]
+* [https://www.electronicdesign.com/technologies/test-measurement/article/21137778/the-tektronix-function-generator-teardown The Tektronix Function Generator Teardown] - Paul Rako @ electronicdesign.com
+{{Documents|Link=TM503}}
+{{Documents|Link=TM503A}}
+{{Documents|Link=TM503B}}
+==Internals==
+The [[TM500 and TM5000 pass transistors|pass transistors]] on the low-power compartments are MJE2901 (151-0373-00, PNP) / MJE2801 (151-0349-00, NPN) − 60 V, 10 A, h<sub>fE</sub> 25 - 100.
 ==Pictures==
-[[Category:Image needed]] ''please add''
+===TM503===
+<gallery>
+TM503_open1.jpg      | TM503 inside
+TM503_backplane.jpg  | TM503 backplane
+TM503_PSU1.jpg       | TM503 PSU
+TM503_PSU2.jpg
+</gallery>
+===TM503A===
+<gallery>
+TM503A_front.jpg      | TM503A front
+TM503A_top.jpg  | TM503A top
+TM503A_rear.jpg       | TM503A rear
+</gallery>
+===TM503B===
+<gallery>
+Tek_tm503b_front_plugins.jpg   | TM503B Front view with plugins
+Tek_tm503b_front_plugins02.jpg | TM503B Front view with [[PG502]], [[SG504]] and [[RO510]] plugins
+Tek_tm503b_front_noplugins.jpg | TM503B Front view without plugins
+Tek_tm503b_label.jpg           | TM503B
+Tek_tm503b_side_view.jpg       | TM503B side view
+Tek_tm503b_rear_view.jpg       | TM503B rear view
+Tek_tm503b_top_view.jpg        | TM503B top view
+Tek_tm503b_bottom.jpg          | TM503B bottom view
+Tek_tm503b_pwrspl_front.jpg    | TM503B power supply front view
+Tek_tm503b_pwr_supply.jpg      | TM503B power supply top view
+Tek_tm503b_pwr_supply_rear.jpg | TM503B power supply rear view
+Tek_tm503b_extender01.jpg      | Using a TM503B for repairing plugins
+Tek_tm503b_extender02.jpg      | Using a TM503B for repairing plugins
+</gallery>
+===Schematics===
+<gallery>
+TM503-schematic.png | TM503 schematic
+TM503-block.jpg | Block diagram
+TM503-interface.jpg | Interface connectors
+</gallery>
-[[Category:TM500 mainframes]]
+[[Category:Manual needed]]
-[[Category:Introduced in 1973]]