Documents for Ortofon GO741 cutting amplifier setup downloads of manuals schematics and technical notes these documents are the complete collection of what we have available for the current setup of the Ortofon Disc Cutting Amplifier equipment for Lacquer discs and Vinyl manufacturing You will find the following items here : GO/GE741 Cutting Amplifier CPS741 Control and Correction Amplifier STL732 Treble Limiter Amplifier DSS731 - DSS732 - DSS821 Cutterheads plus various articles and notes together with my personal technical scribbles and measurements   click on the links for download - and press "backspace" to return press "F5" sometimes to reload the page - there might be new updates coming up please note that the filesize may be quite large sometimes especially those scanned as pictures the quality aint always beautiful but we consider a bad copy or simple information better than none
	For more information about me personal you might also be interested in my current website www.etec.dk Here you may also find more information and downloads of the older Ortofon valve vintage equipment together with some of my electronic designs hereunder also the analogue Bass and Treble limiter DBTL20. ~ written by Torben Roenne - former technical employee of Ortofon year 1976 to 1982 ~
	GO741 Cutting amplifier + GE741 Power supply: GO741 Ortofon Cutting Amplifier - Instruction Manual - Part 1 - Fundamentals - 21111632.PDF - 33 pages 4MB GO741 Ortofon Cutting Amplifier - Instruction Manual - Part 2 - Setting up and adjusting the equipment - 21111633.PDF - 48 pages 6MB GO741 Ortofon Cutting Amplifier - Instruction Manual - Part 3 - Power Section and Play back - 21111634.PDF - 50 pages 6MB GO741 Ortofon Cutting Amplifier - Leaflet - high resolution - 21111629.PDF - 6 pages 36MB GO741 Ortofon Cutting Amplifier - Power Amplifier Schematic A0061 - 21111636.PDF - 1 page 0.15MB GO741 Ortofon Cutting Amplifier - Power Section Schematics A0061 + A0054 - high resolution - 21111637.PDF - 7 pages 20MB GO741 Ortofon Cutting Amplifier - Schematics only for service and repair - 21111630.PDF - 24 pages 4MB Ortofon Cutterhead Connections for DSS661-731-732-821 - 1 sheet.PDF - 1 page 0.1MB
	CPS741 Ortofon Correction Amplifier CPS741 Ortofon Correction Amplifier - Manual Complete - 21111615.PDF- 43 pages 4MB CPS741 Ortofon Correction Amplifier - Leaflet - high resolution - 21111627.PDF - 5 pages 29MB CPS741 Ortofon Correction Amplifier - internal wiring schematic - with wire color codes - 21111624.PDF - 1 page 8MB CPS741 Ortofon Correction Amplifier - rewiring to get rid of pre-post crosstalk - 21111625 .PDF - 3 pages 18MB CPS741 Ortofon Correction Amplifier - internal wiring schematic - 21111616.PDF - 1 page 0.5MB
	STL732 Ortofon Treble Limiter STL732 Ortofon Treble Limiter - Instruction Manual Complete - 21111601.PDF - 24 pages 3MB STL732 Ortofon Treble Limiter - Leaflet - high resolution - 21111628.PDF - 4 pages 22MB STL732 Ortofon Treble Limiter - Schematic Diagram only - 21111605.PDF - 1 page 0.2MB STL732 Ortofon Treble Limiter - Schematic Diagram only - high resolution - 21111603.PDF - 1 page 11MB STL732 Ortofon Treble Limiter - Test Procedure - 21111604 - size 1 page 0.1MB - 5 pages 0.4MB STL841 (732) Ortofon Treble Limiter - Instruction Manual - new model not finished - 21111600.PDF - 7 pages 0.7MB STL841 (732) Ortofon Treble Limiter - Instruction Manual - new model not finished - 21111601.PDF - 4 pages 0.4MB
	DSS731-732-821 Ortofon Cutterheads DSS731-732-821 Ortofon Cutterheads - Instruction Manual - 21111612.PDF - 20 pages 2MB DSS731-732-821 Ortofon Cutterheads - Leaflet - high resolution - 21111609.PDF - 4 pages 53MB DSS731-732-821 Ortofon Cutterheads - Covering letter by repair - 21111622.PDF - 5 pages 0.4MB DSS731-732-821 Ortofon Cutterheads - Differences and technical mesurements - 21111620.PDF - 4 pages 0.4MB DSS731-732-821 Ortofon Cutterheads - Wiring to a Neumann Cutting Lathe for Tecnicians only - 21111614.PDF - 4 pages 1.5MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 0 - 21111600.JPG - 1 page 18MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 1 - 21111601.JPG - 1 page 11MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 2 - 21111602.JPG - 1 page 12MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 3 - 21111603.JPG - 1 page 10MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 4 - 21111604.JPG - 1 page 7MB DSS821 Ortofon Cutterhead - Leaflet Picture - High Resolution - Page 5 - 21111605.JPG - 1 page 4MB DL791 Ortofon Cutterhead Dummy Load - 21111635.PDF - 4 page 0.5MB
DBTL20 Bass and Treble Limiter analogue version without switching noise. High and Low frequency regulation individually. Dynamic action with signal level. Completely tranparent at low level - increasing action with increasing signal level.	Individual pc boards schematics GO741 Ortofon Cutting Amplifier - Schematics - A0027 G0741 equalizer board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0051 G0741 monitor board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0054 G0741 power driver board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0055 G0741 impedanse matching board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0056 G0741 safety board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0057 G0741 meter driver board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0058-1 G0741 pick up magnetic board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0058-3 G0741 pick up dynamic board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0059 G0741 relay board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0060 G0741 feed back board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0061 G0741 power stage board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0062 G0741 monitor switch board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0084 G0741 power supply 15 volt board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0088 G0741 pick up RiAA board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0089-1 GO741 input circuit board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0089-2 G0741 input circuit half speed board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0090 G0741 half speed switch board.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - GO741 chassis back panel.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - GO741 chassis wiring.PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0082 GE741 power supply series regulator .PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0085 GE741 power supply series regulator .PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0086 GE741 power supply positive regulator .PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - A0087 GE741 power supply negative regulator .PDF - 1 page 0.1MB GO741 Ortofon Cutting Amplifier - Schematics - GE741 power supply - chassis and transformers.PDF - 1 page 0.1MB
	Vinyl mastering in general : Physical process of cutting gramophone records by Fritz Nygaard - Part 1 - 25111618.PDF - 33 pages 3MB Physical process of cutting gramophone records by Fritz Nygaard - Part 2 - 25111619.PDF - 32 pages 3MB Article from Studio Sound - Disc Cutting System Improvements by Tony Bathelor TAM Studio - 21111621.PDF - 4 pages 1MB
	Mechanical drawings : Ortofon Cutterhead Mounting piece backplate 06121600.PDF - 1 page 0.08MB Ortofon Cutterhead Mounting piece backplate 06121600.JPG - 1 page1MB Ortofon Cutterhead Mounting piece for Neumann Head and suction pipe 06121601.PDF - 14 pages 1MB this set of drawings are for ataching the groove suction pipe to the cutterhead suspension. remember to use a very soft type of hose at the other end so the cutter can move freely. Yes this one is for the Neumann cutterhead only - but i think you propably can get the pickture of how it works. i dont have the corresponding version for the Ortofon head - yet.
	Remember : in order to return from document pages - use "backspace" ! and also do press "F5" now and then to update the internet page copy on your local computer.
	Sorry - I still dont have the information on how to modify the Ortofon amplifiers to drive the Neumann heads If anybody holds this kind of information we would very much like you to contribute to this site Thank you very much in advance   this is the end for now more is coming up later - whenever we find something revision 2017-06-30 kl.12:54 Best regards from Torben Roenne www.etec.dk

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