FlatKeys

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FK50240 Top Octave Synthesiser Chip

The original MK50240 was called a top octave synthesiser. However it didn’t actually synthesise anything, it just divided down a master clock using ‘approximate’ divisions to give the top octave for various keyboard instruments.

The originals are getting rare, and we kept being asked to do something about it. So, in true FlatKeys spirit, we decided to make not just a replacement (to keep those older instruments going) but a revolutionary true synthesiser with accuracy to match the expectations of the 21st Century.

Our FK50240 replacement chip has 12 real synthesisers that tune from the original master clock to the desired notes, with a worst case error of 0.05 milliHertz (0.00005 Hz).

FK50240 is a compatible replacement for the following devices (please see Top Octave Generator link left and sub-links for device-specific information):

50240
50242
AY-1-0212
ECG-2043
M50240
M50241
M50242
M5891A
M5891B1
MC1180L
MC1183L
MC1184L
MC86B1
MM5832
MM5833
MM5843

MO82B
MO83B
MO86B
MO87B
S2555
S2556
S50240
S50241
S50242

Specials (additional charge applies - please contact us if you need replacements for these):
147196
AY-3-0214

Hammond X5 modification sheet. Click here to download.

The FK50240 can work with any supply voltage between 8v and 16v (the
originals were 11v-16v).

The FK50240 copies any vibrato (on the master clock), just like the originals –
but now with the correct tuning!!

What should I buy?

The FK50240 has been made to be compatible with any target device. When ordering you need to specify which target device you need the FK50240 to be compatible with. We will do the rest.

On its own, without a scale switch, the tuning is the original device tuning you will be accustomed to.

Prices

Prices include standard shipping worldwide. Prices include VAT at the prevailing rate where applicable. All import duties and taxes are the customer's responsibility.

FK50240 configured for target device MK50240 - £52.80
FK50240 configured for target device MK50242 - £52.80
FK50240 configured for target device MM5832 / MM5833 pair - £52.80

Extras

Scale switch. Adds the ability to select equal temperament/original division ratios/Bach-Lehmann 1722 well-tempered tuning. Panel hole size is 6.5mm. Maximum size behind panel is 14mm. Total depth is 33mm.
Transpose switch. Adds the ability to change key +5/-6 semitones. Panel hole size is 9.5mm. Maximum diameter behind panel is 32mm. Total depth is 37mm.
Transpose switch with Octave shift. As transpose switch above, but with ability to shift a whole octave up (where possible, according to the input clock - contact us if you are not sure) & down.  

Note regarding postage for switches : If you are ordering switches at the same time as the FK unit, worldwide standard shipping is included in the overall price.

If you are ordering switches independently from FK50240 units (ie you've already got a unit and want to plug in the switches afterwards), please click the 'Additional Shipping' button to cover shipping costs for these switches.

The switches below are shipped free of charge when ordered at the same time as the FK50240 devices above.

If ordering switches separately, add £3.30 shipping using the button at the bottom.

Scale Switch - £5.28
Transpose Switch - £8.98
Transpose Switch with Octave shift - £15.58
Additional standard shipping - £3.30 (this option only necessary if ordering switches separately from FK units)
 
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