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tab panel

Stop tabs

Stop tabs can break at the inside. It concerns a small component with little pins wich in fact is a part of a switch. Repairsmen used -at that time- the wrong contact spray wich gnawed at plastic. Later Eminent provided the organ with stickers at the inside on wich the right spray was mentioned.

These broken parts can be ordered at Serviceburo de Bruijn

To replace the broken parts the stop tabs have to be removed (3 panels with 2 propellers). Pay attention during removing for a good transit of the contact-wires. The broken parts can best be bored out; at that spot the new parts can be placed.


< closeup of a broken stop tab; pay attention to the broken pins inside of the stop tab (wich should be removed).






< drilling one of the broken pins out of the board





< production year



< sticker with contactspray information

Stop tab contacts and pedal contacts

The switch contacts of the stop tabs will oxidise (just like the basses). Carefully scour the contact-wires with a sandpaper or a little grindstone.

Scouring can can be done directly in the upper part of the organ (after disposal of the tab panels ). It is also possible to overturn the upper frame to the upside. Therefore you have to remove the two foremost screws of the left and right side from the frame. As soon as the frame stands up the contact-wires can be scoured through a special made slot (as shown here).

N.b: instructions on this site are based on the standard version; be aware that there are slight differences with the theatre version!

Jackplug contacts

More oxidation to come :-( the internal contacts of the jackplug connector [front organ] can get oxidised. Some annoying side effects were reported (mono sounding/speaker alters into micorphone etc.). Spray its 3 contacts (3 half boles) and afterwards put a plug in and out for some time .


At sticking keys the so-called gilded feather contacts are filthy. The best solution is not to clean but to twist the feathers. Per key, each consonance has a gulded feather. In the upper manual there are 5 feathers per key, in the lower 3.

To reach the feathers, the upper metal frame must be put upside (check register and pedal contacts). With that the keys become well visible.

Next, unscrew the 2 propellers at the outside of the cupboard (NB the capsules are provide with propeller wire). By unscrewing the 2 frame-screws at the inside of the cupboard, the frame completely overturns with the keyboards down.





< from underneath the feathers are well visible and its function becomes clear as soon a key is pressed.






< at the upper side of the electronic print 5 soldering points appear on wich the feathers are attached. Carefully heat these points with a soldering bolt and twist the feathers 180 degrees with a tong. The feathers of the lower manual are much more difficult to reach.




Buttons and faders

Push buttons and faders must be cleaned with clean air and contact spray on an alchohol base (never use fat-containing spray!). It is important to remove the dirt good before spraying to avoid the dirt being mixed with the spray. The use of Spray is not without risk and will not help in all cases. Always inform about the right kind of spray.

The stringsection panel (picture left) can be removed by a bolt at the upper side of the panel (at the inside: hold the ring and nut during removing to avoid loosing them in the organ).

The bottom panel with its 4 faders is difiicult to remove because one of the screws is partly under the keys. Two keys have to be removed in that case: first release the feather from the key (check picture left), next push the white pin and carefully slide de key towards you. When both keys are removed the screws can be removed (there is also a screw under it).


< Bottom panel with 4 the faders.




The panels at the left-hand side of the organ are easy to be removed. At the picture: the back of the upper panel (pay attention to the high voltage on the main switch!).


Volume pedal

The pedal works by means of a light and a light sensitive cell. By pressing the pedal the light sensitive cel receives less light resulting in an increase of the volume. The light is sometimes broken or has a contact issue; in that case the organ will sound very loud.

To remove the pedal a screw at the front must be removed. Next pull the pedal at the bottom in your direction. The pedal can be opened by removing the bolts at the side. The light has the resemblance of a bicycle light, in this case of 24 volts.

< One out of three famous string-ensemble boards. The other three -almost similar- boards are used for the Orbitone effect.

< transformer for Rithmix (available at that time for about 350 euros). The large transformer is the main feed for the organ (swithable between 110 and 220 volts).

< main feed organ

< Orbitone amplifier






< Orbitone amplifier backside

< Modulation cirquit front








< Modulation cirquit back



< Oscillators: in these 12 parts the base tone is made, one for each note. Octaves are generated by dividers wich halves the frequency each time it passes a divider. There are up to 6 dividers per oscillator.

A fautly divider sounds this way; because -in this example- the problem occurs in all octaves, the first divider is the faulty one.


< serial number at backside of organ

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