SQC-50 mk3 (english)

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Deutsche Anleitung: Siehe SQC-50 mk3


Frequency inverter/power conditioner with 230V/50Hz output, square wave. For European Hammonds to be used in US (60Hz) or on instable 50 Hz mains (accepts 40 to 400 Hz input), i.e. to stabilize organ tuning on mains from mobile power unit. Fits all electromagnetic Hammonds including those with self-starting motors (L-, H-, T-series).

Combined with our optional controller unit the device offers tuning in cent or half note steps.

Crystal stabilized circuit, no deviation from set frequency. Simple installation, is looped into wires to run motor.

Step-up transformer 117V/230V required (not included) for use in US (117V mains). Recommended power rating 160 VA (organ) or 400 VA (organ and Leslie).


PLEASE NOTE: Soldering skills required. Installation requires authorized technician. Disconnect organ from mains before installation or changing fuse (pull mains plug).

Following instructions describe installation in B3-/A100-Series consoles. For other/older models, refer to service manual of your organ and consult an organ technician.


The converter should be placed on left side inside the organ (seen from behind), either on left wooden side panel or below the generator (on A-100 series). For increased safety and lower noise sensivity, it is mounted in a vented metal box. The metal box must be earthed/grounded by connecting PE terminal to organ’s generator chassis ground to prevent interferences/noise.

The SQC-50 simply has to be inserted into the run motor’s supply wires. Desolder run motor’s wires (two pairs red/black in parallel - do not separate them!) from generator’s wire panel and connect to SQC-60 output terminals #3 and #4 (terminals #1 and #2 are not present). Connect 230V input terminals #5 and #6 from SQC-50 to former motor terminals (middle and rightmost of 7 terminals at console organs, seen from behind) on generator’s wire panel. Leave all other cables going to generator terminal untouched. Wire length and polarity is not significant; motor wires may be extended by wires capable of mains voltage only. Use shrink tube for insulation. Connect PE terminal #7 to generator chassis ground and, if present, PE terminal of mains plug. Terminals may be pulled off for easy de-installation or exchange.

A LED inside the power conditioner will flash five times rapidly when powering up, also when tuning changes. It will blink slowly in normal operation.

To replace the fuse, open case (4 self-tapping screws on sides). Only replace with rated fuse 5x20mm (1.4A or 1.6A slow-blow).

European to US Conversions

230V/50Hz organs require installation of a 117V/230V step-up/insulation transformer to be used on 117V mains. Remove power cabling and old mains plug and replace with IEC socket with proper cabling, including PE (protective earth, green/yellow wire) as shown. A 240VA transformer is sufficient for B3- and A-100-type organs. If a 230V Leslie is to be powered from organ's step-up transformer, a 400VA type is recommended.

Placement of transformer might be tricky to avoid hum in preamp or generator notes. Try best position before final installation of cables.

Hum Supression

Mains line filter

If you ground the SWC60/SQC60 and there is a Leslie with the "death caps" .047uF from each side of AC line to ground removed, you will get a bad hum. We would recommend an encapsulated mains line filter (like this one pictured) rated at 3 Amps min. with ground lug connected to organ chassis, inserted into 117V wires from wiring panel to SWC60/SQC60. For Leslies with "death caps" removed, I would also recommend the installation of a line filter into Leslie Amp.

PCC Connection


The PCC power conditioner controller unit is an optional accessory for remote controlling of our new series of Power Conditioners SWC-60, SQC-60 and SQC-50 mk3. It has a built-in LCD and rotary encoder for simultaneous transposing/tuning in half note or cent steps, i.e to achieve orchestral tuning. Box is attached by RJ45 patch cable (1.5m included) to CTRL connector of SQC-50. Controller box may be mounted in reach of organist by velcro tape. Always switch organ off before attaching/removing PCC unit!

The PCC has a built-in display with two rows. Upper row shows transpose value (plus/minus 6 half note steps), lower row shows fine tuning in cent steps. On power-up, locked mode is active. Press knob to enter transpose mode, indicated by an arrow pointing to NOTE number. Turn encoder knob to change transpose note. Press knob again to activate tuning mode and to go back to locked mode. Setting is saved permanently (even when disconnecting the PCC or power cycling the organ) when locked mode is re-entered. Note: First series of SWC/SQC-60 just toggle between transposing and tuning mode.

It is possible to fine tune the organ even when transposed.

The PCC allows transposing of 6 half note steps up or down. Dependant on generator condition, the whole range may not be achieved on every generator; this is not a fault of SWC-60/SQC-60 nor the PCC. Run motor may stall if range exceeded and organ must be restarted thereafter. Also, there is a chance to overheat the run motor.

Please note that vibrato frequency also changes with transposing. Also the organ may sound somewhat dull in extreme transpose positions due to fixed generator filter frequencies.

Technical Data

Input 220V to 240V, 40Hz to 400Hz

Output 230V 50Hz crystal controlled, filtered square wave, variable frequency with optional controller unit

Output power: 50W

Installed in vented aluminum shielding box, dimensions 164 x 115 mm, height 55 mm (6 x 4.5 x 2.1 inches), mounting hole pattern 154 x 90 mm (6.06 x 3.54 inches).