GENRAD TOUCH DRIVER

If these components have been damaged to the point of allowing dirt and dust to enter, the damaged front or rear cover, or both, must be replaced. Meters with thermo-plastic cases are typically held together with "snap-on" front covers that must be carefully pried apart very carefully so as not to crack the "styrene" type plastic that becomes even more fragile as it ages. Calculate Varies based on location and shipping method. After final assembly has been completed, and the overall cosmetic inspection has been completed, the properly rated fuses are installed, the power switch is placed in the "on" position, the knob is positioned mid-scale and the power cord is plugged into a "hi-pot", high-voltage 1,vac test source. This is absolutely what took the longest. If this bending method causes too much deflection of the hairspring from its concentric position around the pivot, the length of the hairspring must be altered very slightly by un-soldering it from the zero-lever and re-soldering at the correct position. Depending on the type and brand of the specific iron-vane meter, this adjustment is made either by loosening the lock-screw of the deflection paddle and shifting it's position in the "coil cup" and re-locking it.

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On the plus side, very thick caps meant you could do it without a problem and you physically removed all the yellowing.

DAVID RIDDLE'S VARIAC RESTORATION PROCESS DETAILS © 11-4-16

Courtesy of Science History Institute. New, properly-rated fuse holders are installed gernad all internal wiring that will be soldered, is secured mechanically prior to soldering.

I've had to control the header by turning it on and off in flightcontroller instead. The power cord brass plug-tips are brightened with sandpaper and soap-filled steel-wool.

Other knob materials include thermo-plastics that are very susceptible to scratching because the material is soft, and since it is not heat resistant, polishing is fairly difficult and time consuming.

We offer a 14 day return privilege on our goods, the buyer is responsible for return shipping costs. General Radio made a lot of cool electronic gear from actual radios to oscilloscopes and variacs.

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So there's very little sweetspot for easy typing and not accidentally hitting multiple keys and things, even when slowing the scan rate down. The brush assembly is precisely attached to the rotor and checked for full freedom and ease of movement. This item will ship to United Statesbut the seller has not specified shipping options. Any genead the painted case components that are to be re-painted are stripped using epoxy stripper, washed with detergent, thoroughly touxh with hot water and oven dried.

A long, very thin, camel's hair brush, fully filled with paint, is tipped into the cursor recess allowing the paint to flow through "capillary" action to fully fill the recess.

If the meter is not linear, there is an additional adjustment point usually to the left of the coarse adjustment point that is utilized to calibrate the upper portion of the scale. It's just the cutting that seems to be tricky.

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Sat Aug 04, 5: After polishing, the meter cover is again washed to remove any residual polishing compound and dried. Very minor and fine superficial scratches can generally be removed by hand with a commercially available, mildly abrasive, plastic polish and a clean soft cotton cloth.

When polishing a thermo-plastic knob, the entire process must be monitored visually while using a light touch and continuous movement to prevent permanent and irreversible damage caused by overheating and melting of the fragile plastic material. This website uses cookies to perform analytics, improve functionality, and enhance user experience.

I don't like the hard foam as it affects key feel but very nice job overall! When the finish is not even or is not textured enough, the plate can be re-heated and re-sprayed for the desired textural effect.

For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees. Read item description or contact seller for details.

Since the meters used in variacs are measuring AC voltages and amps or watts, the specific type of meters most commonly used are of the "iron-vane" design and as such are susceptible to erroneous readings from external magnetic fields, the exact magnetic fields produced by the variac itself!

If these components have been damaged to the point of allowing dirt and dust to enter, the damaged front or rear cover, or both, must be replaced. Sat Toucb 29, 5: Mon Jul 30, The usual standard hard foam mod to remove every bit of mush.

Meters with thermo-plastic cases are typically held together with "snap-on" front covers that must be carefully pried apart very carefully so as not to crack the "styrene" type plastic that becomes even more fragile as it ages. Refer to eBay Return policy for more details. Shipping cost cannot be calculated.

After thoroughly drying the knob, inspect it to determine the severity of the scratches, deep ones will not polish out and need to be wet-sanded first using a sequence of coarse to fine sandpaper as described previously in the meter cover restoration until a smooth matte finish is obtained. If the nameplate is large and the damage includes large areas of missing ink or paint, all of the nomenclature letters, numbers graphic entities, etc.

Most scratches can be polished out to a very high sheen. So this meant every single last one of the keys had to be sanded and repolished by hand to restore their color.