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x Ortofon disc cutting equipment - Bass & Treble Limiter for Cutterhead protection


On this page you will find Ortofon vintage gear, Ortofon disc cutting equipment

We offer Service, repair and support of Ortofon electronic amplifiers, filters and Cutterheads.

We sell Bass and Treble Limiter / DBL10 and DBTL20 used to protect Cutterheads from overload damage.

The subjects on this page are: 
Ortofon Cutterhead.
Bass and Treble Limiter / DBL10 and DBTL20
Ortofon Cutting Amplifier
Ortofon Correction amplifier
download of old Ortofon diagrams and data sheet

x Ortofon cutterhead

The Ortofon cutterheads DSS 731 and DSS 821 are the answers to the stringent requirements for correct and true transfer of the program material to the disc groove. Years of experience in the field of sound recording. Intense research in the physics of vibrating systems. Traditions of high class mechanical craftsmanship......

We offer Cutterhead Service and Repair Support on DSS731 / DSS732 / DSS821
Ortofon cutterhead. Service, repair and support


Ortofon cutterheads DSS 731 and DSS 821






x Bass and Treble Limiter / DBL10 and DBTL20

Bass and Treble Limiters are used for protecting Cutterheads against exessive mecanical excursions

Bass and Treble Limiter / DBL10 and DBTL20

We offer two models:

DBL10 Dynamic Bass Limiter
DBTL20 Bass and Treble Limiter

DBTL20 is a combined stereo Bass and Treble limiter. Its Bass limiting functions and specification are exactly the same as described below for DBL10 Dynamic Bass Limiter. In addition DBTL20 has treble limiting function.

The function of the DBL10 filter limiter is to reduce excessive signal levels in the low frequency range from zero to 800 Hz in order to obtain optimal programme signal in sound reproduction systems and to protect terminal equipment such as cutterheads or analog/digital converters from overload. The unit has also proven to be an invaluable tool in other kinds of sound systems such as tape mastering, soundtracks, broadcasting, microphone interviews etc.

The DBL10 Dynamic Bass Limiter offers two separate channels of bass filtering with dynamic regulation with respect to the programme signal. Both the signal level and the crossover frequency are regulated at the same time which means that a heavier (more selective) filter action can be allowed before it becomes audible. The limitation will only influence the audio signal in the relatively limited frequency range where action is needed thus making the regulation undetectable for the human ears. At normal levels the filter is completely transparent to the signal and action will take place only if critical peak signals are introduced.

Primarily this unit is constructed for use in disc cutting systems where it is essential that high peaks in the bass region are limited since such peaks may cause distortion when the record is played back or even be impossible to cut because of the physical excursion of the cutting stylus in relation to the groove width.
Peaks of longer duration may also overload the cutterhead and either cause a drop out of the thermal protection circuit or even damage the cutterhead.

In digital systems it is essential that the A/D converters are protected against overflow which otherwise would result in unpredictable distortion. By limitation of excessive audio peak levels the overall recording level becomes less critical. In practice giving less troubles in the master room and results in less rejections and higher production flow.

The DBL10 front panel is equipped with sensitivity selector to control the overall filter action as well as Attack and Release selectors to control the speed of action. Although the DBL10 is a stereo unit all selectors can be operated individually on both channels for precise settings.
Two light bars on the front panel roughly indicate the filter action. On the back of the unit are located rejection outputs which can be monitored with a spectrum analizer thus giving an exact image of what's actually being subtracted from the signal path.


DBL10 Dynamic Bass Limiter. Price 1.100€ /pc.

Quantity: Check Out

DBTL20 Bass and Treble Limiter . Price 1.800€ /pc.

Quantity: Check Out



DBL10 Dynamic Bass Limiter data

Bass and Treble Limiter. DBL10 and DBTL20

x Ortofon Cutting Amplifier


Ortofon Cutting Amplifier GO741 / GE741
Transistor Version. Service and Support



Ortofon Cutting Amplifier GO741





x Ortofon Correction amplifier

Ortofon Correction amplifier CPS741

Ortofon Correction amplifier CPS741





x Download Ortofon vintage documents

To download: click the link and it opens in a new window. Or right click and save on your computer

Ortofon cutterheads DSS 731 and DSS 821 (same as shown above on this page)
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Ortofon Cutting Amplifier GO741 / GE741 (same as shown above on this page)
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Ortofon Correction amplifier CPS741 (same as shown above on this page)
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STL631_01 Schematic - Stereo Valve Trebble Limiter
STL631_1 Schematic - Stereo Valve Trebble Limiter
STL631_2 Mecanic - Stereo Valve Trebble Limiter
STL631_3 Block Schematic - Stereo Valve Trebble Limiter
STL631_4 Block Schematic - Stereo Valve Trebble Limiter
STL631_5 Frequency Response - Stereo Valve Trebble Limiter

GK571_1A Schematic - Monitor Valve Amplifier
GK571_1B Schematic - Monitor Valve Amplifier
GK602_1 Schematic - Stereo Monitor Valve Amplifier

GOS601_1A Schematic - Cutting Valve Amplifier
GOS601_1B Schematic - Cutting Valve Amplifier

KS601_01 Leaflet - Stereo Valve Amplifier
KS601_02 Leaflet - Stereo Valve Amplifier
KS601_03 Schematic - Stereo Valve Amplifier
KS601_03XL_1 Schematic - Stereo Valve Amplifier
KS601_03XL_2 Schematic - Stereo Valve Amplifier




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