The A100 I bought used has a volume (expression) pedal that flops down to the max volume. The previous owner used a "hack" and attached a string+spring to the back of the pedal to hold it up to the min volume position. But this makes it behave like a gas pedal and you have to keep your foot on in all the time and cannot be left at a set volume.

The pedal is attached to a linkage that goes through the side of a cardboard pedal baffle/housing and then up to a small box where it attaches to the stem of a potentiometer.

The pedal pivots on a horizontal axle and there's a screw on each end. Tightening the screws on ends solves the problem and the pedal behaves as one would expect and stays wherever its positioned to.

But is the pedal movement simply held in place by the friction of those tighter screws at the ends of the pivot axle? It seems too simple. I was expecting to find some missing counter weight, but perhaps the solution was just tightening those screws where the pedal attaches to the axle.

Can someone confirm that this is indeed all that's needed?

Thanks,

Russell

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The swell pedals on Hammonds do indeed use friction to keep the last setting when you take your foot off. The screws at the end of the axle simply lock the pedal to the axle, the axle itself turns as the pedal moves, and it's the friction of the axle supports/bearings that keeps the pedal in place.

The A100 I bought used has a volume (expression) pedal that flops down to the max volume. The previous owner used a "hack" and attached a string+spring to the back of the pedal to hold it up to the min volume position. But this makes it behave like a gas pedal and you have to keep your foot on in all the time and cannot be left at a set volume.

The pedal is attached to a linkage that goes through the side of a cardboard pedal baffle/housing and then up to a small box where it attaches to the stem of a potentiometer.

The pedal pivots on a horizontal axle and there's a screw on each end. Tightening the screws on ends solves the problem and the pedal behaves as one would expect and stays wherever its positioned to.

But is the pedal movement simply held in place by the friction of those tighter screws at the ends of the pivot axle? It seems too simple. I was expecting to find some missing counter weight, but perhaps the solution was just tightening those screws where the pedal attaches to the axle.

Can someone confirm that this is indeed all that's needed?

Thanks,

Russell

Thank you Chris. I cannot believe the fix was so easy and wonder why the heck anyone would want an organ volume pedal the behave like an automobile gas pedal. The organ is much more pleasant to play now :-)

R

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All electronic organs that I've ever worked on use some sort of friction device on the swell pedal. I don't know how many times a customer has said to me, "The spring has gone in the swell pedal". In most cases, all that was needed was some adjustment to compensate for wear.

Thank you Chris. I cannot believe the fix was so easy and wonder why the heck anyone would want an organ volume pedal the behave like an automobile gas pedal. The organ is much more pleasant to play now :-)

R