Deep Run Design Audio Products

Update- I originally intended to offer the items below, and others, as standard products. In all honesty the demand just wasn't high enough to cover the costs of a production run. Currently I offer contact design services to commercial clients only. The items below are examples of what can be done, but they are not available for sale.

The Deep Run Design Turntable Bearing

platter bearing assembly platter bearing components

This is a platter bearing assembly designed for the DIY turntable builder. It may be offered in several materials and certainly in several configurations, depending on the platter interface. It's based on the very heavy duty bearings used in the professional broadcast turntables of the past like Empire and Rek-O-Kut models. The fundamental problem in turntable bearings is avoiding all noise-producing metal-to-metal contact. In a higher speed bearing or with a pressurized oil supply this is quite easy, but the low surface speeds in a turntable bearing make extreme demands on part surface finish and geometry to insure a perfect oil film. It's nearly impossible using common small spindle diameters; the Deep Run bearing uses a 0.5" spindle. There are lots of instructions on the web concerning hand lapping and polishing, but parts having the necessary precision to perform at the level we feel is necessary rarely result from those methods; we have a great deal of experience with ultra-precision geometry and fits and access to the equipment necessary to do the job right. See the page on the Sunnen honing machine here.

The Deep Run Design bearing is a self-pumping recirculating design in that oil is actively pumped up the spindle, lubricating the entire bearing sleeve, particularly the oft oil-starved area near the top, then the oil travels back down to the bottom well of the bearing via a return hole. The photos above do not show the actual oil groove design (we're not giving away all the secrets here!) and the top of the spindle has not been machined for a specific platter or sub platter.

The thrust bearing plate can be supplied in several materials, depending on customer preference. Those materials are presently Lignum Vitae wood, a proprietary high performance synthetic (shown), and chilled (hardened) steel. The design is such that customer made/supplied thrust surfaces and ball bearings are easily used. Further, the thrust surface disk is slightly offset from the spindle, meaning that a simple rotation gives a fresh surface. Using both sides, there are probably 10-20 fresh contact spots available. Though the bearing is designed for a high performance DIY turntable, it can also be adapted to many commercial tables by specifying a hollow spindle option to accept the original turntable spindle. The bearing body is 1" diameter and can accommodate plinths up to 1" thick.

The Deep Run Design Tonearm

This is in the concept phase, but all comments are welcome. It is our belief that pivoted tonearms have been developed and perfected to a high degree, and no order-of-magnitude improvements are left to find. Their weakness is the use of offset to achieve a minimum tracking error. This creates a "battle of dynamic forces" on the cantilever that can't be corrected with any known anti-skate system. It is our opinion that the arm pivot must be in line with the cantilever. Linear tracking tonearms solve the problem, but cost is severe; tremendous effective mass in the lateral direction. The sophistication of many linear tracking tonearms also leaves much to be desired until you reach very high price points. The proposed Deep Run Design solution is a fairly conventional pivoted arm having no offset. Full length, low mass and low friction. An arm that will follow warps and off- center records as well as any. It will however, be a linear tracking system. The arm will mount to a movable support, driven by a servo system, such that the arm remains tangent to the groove at all times. The devil is in the details, and the design of the movable support system is critical. We are not releasing any details on the motion system at this time, but we believe a suitably high performance solution is in hand.

The Deep Run Design Test Buffer

It's common in audio testing to find that signal generator capabilities aren't up to the current demands of what's being tested. This is common when testing speakers and crossovers. The usual solution is to drag out whatever big stereo power amplifier is handy. The downside is that the amp is bulky and often has more power than needed, risking the health of the device-under-test (DUT). The Deep Run Design Test Buffer is a compact extremely low distortion DC coupled amplifier, designed to augment audio signal generators and other test equipment. It can provide several watts of clean power and is protected against most common faults. Combined with a small speaker it can also be used for signal tracing. Specifications to follow soon.

The Deep Run Design Strobe Light

This is a modern LED version of the venerable GR and similar stobe lights intended for determining RPM and freezing the motion of mechanical assemblies. It's not to be confused with the crystal controlled strobe lights used for turntable speed measurements. We found other units on the market were overly expensive for many purposes, so this unit is supplied as a battery powered circuit board for the user to package as needed.