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1944 The beginning of audio volume controller manufacturing
-Start of TKD's attenuator and volume controller-
The manufacturing start of the rotary type attenuator ( B and C type etc.)complying to the BTS standard of Japan Broadcasting Corp./NHK.

1960 The beginning of TKD's SA series volume controller manufacturing
-From the rotation type, to the vertical line type -
From the rotation type, to the vertical line type attenuator, and to thefader development.


1979 The development of conductive plastic
-The birth of TKD's original fader-
The manufacturing start of CP, CPA series


1992 The development of motor fader
-The automation fader-
The manufacturing start of AF, MF series.


2000 The development of fader for the DJ mixer
-The new market of fader-
The manufacturing start of DJ fader.


TOKYO KO-ON DENPA (TKD)began manufacturing the "Profader" over 30 years ago.
Due to the high quality and reliability of the TKD range of faders, the Profader is being used by most of the top Professional Audio Companies in the world.

They have even referred to, by our Customers, as being "sexy", due to the almost sensual, smooth feel.

As well as a full range of manual faders, TKD are producing the largest range of motorized faders available.

1) Shaft

TKD have developed a special 'super-grinding' technology
which produces a very accurate component with a superior
finish on the surface of the shaft of the "Profader".
This technology improves the 'feel' of the Profader.


2) Shaft Carrier

TKD have continually researched materials for the shaft
carrier and have developed a special metal-plastic double
layer shaft carrier which gives great accuracy in production,
improves the 'feel' of the Profader and gives long life in


3) Conductive Plastic (CP ) Technology

TKD are renowned specialist in CP technology, with a continuing Research & Development programme.
The current CP technology has unique qualities in printing and moulding techniques only used on the TKD Profader.
By developing a mirror- finish resistance track, peculiar only to TKD's CP technology, the Audio performance of the Profader is superior to other CP technologies and has been highly praised by the major Pro-Audio manufacturers.
This technology also produces the superior 'feel' and extended life cycle.

4) Slider (Brush)

TKD have developed a high quality multi-fingered brush, using a combination of materials, which gives exceptional reliability in operation, very low electrical noise and a very smooth 'feel'.
The 11 finger brush has been developed in conjunction with the CP technology to produce the soft, smooth feel and a very long life-cycle.


5) Assembly and Production

TKD's philosophy in production is  "Technology cannot be seen, it must be touched, used and felt" The TKD Engineers are aware that the fader becomes an integral part of the console and is one component which the user must be comfortable with.
Therefore their philosophy is built into the fader.

TKD continue to develop new products and improve technology where possible.


 Distribute a category of the Website notation in a constant rule by the TKD.
Use a "dB" for a attenuation level.
Determines quantity of attenuation level at each angle.

The product line of the general A, B, C, M, N curve.
Because CP600 series and CP2500 series include "the ladder circuit type of the attenuator category,"Because CP600 series and CP2500 series include "the ladder circuit type of the attenuator category," Please be careful about choices.
Terminal number same as an attenuator by the potentiometer circuit.
1: Input, 2: Output, C: COM(GND), please be careful.

Potentiometer of other brands "3:Input, 2:Output, 1:COM" , please be careful on exchange. 
About load of the measurement

Load: High becomes infinite.
The attenuation level with the potentiometer form is influenced by a load condition on the output side.
The ideal level is infinite.
The error with attenuation specifications appears so that load lowers.
An error becomes around 5% with load 20 times as large as total resistance value,
and the load recommends what I do than 20 times from a judgment that there will be little influence in use.

1) List of categories
Website Category Variable method  Circuit method Measurement condition Products
Step variabled
(With click or  Without click)
Potentiometer circuit
Load: High Potentiometer type attenuator
Load: Specified Custom order
Bridged-T circuit
Load: 600ohm Bridged-T type attenuator
Load: specified Custom order
Bridged-H circuit
Load: 600ohm Bridged-H type attenuator
Load: specified Custom order
Bridged-HN circuit
Load: 600ohm Bridged-HN type attenuator
Load: specified Custom order
Ladder circuit
Load: 600ohm Custom order
Other circuit Load: specified Custom order
(With click or Without click)
Ladder circuit
Load: High CP600 Series
CP2500 Series
CP2511 Series
Potentiometer Step variabled
(With click)
- Custom order
(With click or Without click)
A, B, C, M, N
- CP600 Series
CP2500 Series

2) The difference of ladder circuit and the potentiometer circuit
Measurement condition Ladder circuit Potentiometer circuit
Circuit diagram
Variable resistor [Resistance value between 1-2] + [Resistance value between 2-C] ≠ Total resistance value

Cannot use it as variable resistance.
[Resistance value between 1-2] + [Resistance value between 2-C] = Total resistance value

Can use it as variable resistance.
Characteristic kind to produce The characteristic that followed BTS-50dB decrement specifications or special order. Consecutively variable type: A, B, C, M, N
The characteristic that followed BTS-50dB decrement specifications or special order.
Main use For signal level adjustment. For apparatus setting
For signal level adjustment
Precautions Connect COM to the GND of the circuit.
Do enough examination, tests, and please use it .
Do enough examination,tests, and please use it.
The attention with specifications There is no specification of the residual resistance.

Because it is measured as synthetic resistance with the branch resistance of the ladder circuit, the resistance except the track between output-COM cannot measure the resistance level only for parts of the COM side.

Residual resistance cannot estimate quantity of max attenuation at a deserved value from total resistance.

As for the track resistance level measured as some residual resistance levels, in the case of the quantity of decrement measurement, it is the value that you may ignore judging from apparatus internal resistance.

Display it with a decrement level from the viewpoint of main use.
It is the same as general specifications and displays it with a resistance level.

The interlocking movement deviation assumes it the decrement level notation that followed JIS.
Features A decrement error is rather relatively less to be able to regulate the resistance level of each point.

Can greatly take quantity of cut off.
There are few specifications differences and other companies for a general circuit.
Cannot use it The circuit which needs the resistance value setting such as the operational amplifier feedback circuit.

Circuit to use without connecting COM to GND.

Variable resistance.
Do not greatly get the quantity of cut off to depend on the residual resistance (consecutively variable type).

3) The circuit which is used in an attenuator
Operate Circuit diagram Circuit name Products
Fixed T curcuit -
H curcuit -
Equilibrium state H curcuit -
π curcuit Fixed attenuator series
PAD connector series
(Sold only in JP)
O curcuit Fixed attenuator series
PAD connector series
(Sold only in JP)
Equilibrium state O curcuit -
L curcuit -
Inverting L curcuit -
U curcuit Fixed attenuator series
(Sold only in JP)
Variable Potentiometer curcuit Type-C
Bridged-T curcuit Type-C
Bridged-H curcuit Type-C
Equilibrium state bridged H (HN) curcuit Type-C
Ladder circuit -
Ladder + potentiometer (LP) circuit -
Variabled T curcuit -
Variabled L curcuit -

4) Attenuator calculation
Z= impedance, V and W are resistance value, K= Attenuation factor
Operate Circuit diagram Circuit name Products
Fixed T curcuit
π curcuit
O curcuit
L curcuit
U curcuit
Variable Bridged-T curcuit
Bridged-H curcuit






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56 Orimoto-cho, Tsuzuki-ku, Yokohama, Japan
URL: http://www.tkd-corp.com
Phone: +81-45-470-9341
Fax: +81-45-470-9347

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