Spencer's E-Rolls.com (MIDI valve page)

  Antique Music for A Modern World

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The E-Roll Player has been in production for over six years. As much as I would like to continue production, it is not economically feasible to continue. I will continue to provide support for all systems sold. I have an inventory of spare parts and will retain all pages containing information on the latest as well as the older systems. This page contains links to those pages. If you need any documentation, configuration utilities, firmware updates or any other information or tools and can not find them here, please e-mail me.

Bob Hunt is selling a system called "The Virtual Roll". I highly recommend it as an alternative to the E-roll Player.
Click here for the Virtual Roll Site(new)

Click here for The Virtual Roll Page on this site .

Check the MIDI Valve page for information on the previous model. MIDI Valve Page 2 for pictures and testimonials.

Click here for a page with information about the new system (also discontinued).

New E-Roll Player Installation Manual

Click here Pictures and letters from customers.

Please click here for a PDF brochure describing the previous system, including pricing, The new system will be similarly priced..

Click here for the Installation Manual (Original System) which includes photos of installed systems.

Below, you will find additional information describing the features of the valve block which is the heart of this system.

The valve block measures 1.25" x 1.4" x 5" ( 32 mm. x 36mm. x 127mm) without connection nipples.

Sixteen valves are contained in each block allowing for location close to existing signal tubes. The valve orifice is .90" and the valve travel is .040" although these dimensions may be modified for special situations. Air flow at 4 inches water column is significantly greater than the signal tube / tracker bar configuration in both the Duo-Art and the Ampico A. Therefore the units can be installed at an even greater distance from the stack than the original tracker bar and still have adequate valve action. However, this is not likely to be necessary due to the modular design which allows for distributed valve placement. In addition, the rapid response of the low mass valve will enhance valve action further. Most installations will be done with wye fittings (provided) to connect to the instrument's tubing. Optionally, the valve blocks may be cross drilled (please ask for this to be done) if they are to be installed directly in tubing runs. This will allow for no reduction in air flow through the original tubing.

The valve blocks use pick and hold control. This allows for operation against high vacuum pressure without overheating in extended operation. The pick and hold controller provides an initial voltage for valve opening and a lower voltage to keep the valve open. These voltages may be adjusted for special needs. The pick period is field selectable, however, the default value will suffice for most installations. Once a valve is switched on, it can remain on indefinitely without overheating of the magnet or the associated electronics. For this reason the valves can be installed behind accoustical insulation to produce virtually quiet operation.

The valves will open against a vacuum in excess of 90 inches of water and repeat at a rate of over 20 hertz. This is well in excess of piano action response times. Higher repetition rates are possible by custom configuration. Repetition is also excellent at 4 inches of vacuum and less as the valves are self closing and do not depend on vacuum for their operation.

If you would like to be notified of further developments please send an e-mail to me by using the link on the navigation bar and I will put you on a list for future contact.

Click here Pictures and letters from customers.

Please click here for a PDF brochure describing the complete system, including pricing.