Artifax Books

Scientific Instruments For Sale

Condition: This equipment comes from flea markets, hamfests and estates, and unless otherwise stated they are complete, appear to be in good condition, but are unused by me. Since such items as electrolytic and paper capacitors degrade with age, and switch contacts may need cleaning, you should assume the equipment needs testing and possible repair before placing in service. Some items are merely collectible display pieces. All are offered untested and as found unless otherwise stated.

Empire Devices T-1/NF-105 tuning unit.

The Empire Devices NF-105 EMI Receiver covered, I read somewhere, 10 kHz - 1000 MHz. It was developed for the US Army to perform emission and EMI measurement. ("This was a fancy radio with a needle movement for measurement, and a headphone jack. Hours would be spent hand tuning a frequency band looking for a peak, and when one was found, one would write down the frequency and amplitude. Everything was done by hand.") Several plug-in tuning units were available for the receiver to cover the frequency range. The unit offered here, T-1/NF-105, covers 20 to 200 Mc (today, MHz). The size is about 6-1/2 x 9 x 11-1/2 inches deep. It appears to be in very good physical condition, but it is an estate item which I have not used or tested, so it is offered as as is. Second photo $85.00 (UPS s/h = $12.00) Inventory #706EMP

Leeds and Northrup potentiometer box..

This is model 7581 potentiometer voltage scaling unit. It measures about 9-3/4 x 6" and is 4" deep excluding the terminals. From a college engineering laboratory. $20.00 + shipping. Inventory #LN758

Leeds and Northrup model 4775 resistor substitution box.

The knobs, which are 1, 10, 100 and 1000, are marked in two sets of zero to nine. Tested and works, but accuracy not guaranteed. $12.00 + shipping. Inventory #LN4775A

Leeds and Northrup model 4775 resistor substitution box.

The knobs, which are 1, 10, 100 and 1000, are marked in two sets of zero to nine. Many small chips in the panel paint. Tested and works, but accuracy not guaranteed. $12.00 + shipping. Inventory #4775B

Leeds and Northrup type K potentiometer..

This is an old L&N potentiometer, type K, serial number 128733, base dimensions 9-1/2 x 16-1/2 inches. According to CENCO catalog F (1929), this model offered the utmost in accuracy and precision in measuring voltage, and consists of 15 coils of 5 ohms each, adjusted to an accuracy of 0.01%, in series with a slide wire; the case is of mahogany, the top panel is of ebonite, and the slide wire cover is of Bakelite. This is intended to be used with a galvanometer and a standard cell. As found, shows age but no damage, the metal tag on back has some corrosion, includes one large plug and four small plugs (missing dust cover). CENCO sold this for $250 in 1929! Second photo Our price, $225. Inventory #LN/CEY (UPS ground S&H = $30.) Inventory #LNPOT

Vintage Bud variable condenser in box..

This is a new-old-stock (unused) BUD no. JC-1566-A dual junior transmitting condenser, max cap 18 mmfd per section, min cap 6 mmfd per section, air gap .175 in its original box. The box measures about 3-1/2 x 3-1/2 x 8 inches; the corners have some wear but the blue and yellow colors are still bright. Use the condenser (today, capacitor) in a homebrew transmitter and the box for display. Second photo $15.00 (S&H=$7.00) Inventory #BUDCAP603

Western Electric model 35C test set..

The W.E. test set commonly found is the 35F, in a metal case and with a round meter. The one here is the much earlier 35C in a wooden case and a Weston model 267 milliameter. Inside the wooden cover is a schematic of the unit. The handle and strap are leather. Approximate dimensions 8-1/2 x 11 inches x 6-1/4" high (with cover). Cosmetically it is in good used condition, with a W.E. decal, two Southwestern Bell decals, and "AB TOLL" stencils on the case. Valuable for the parts, but I prefer to offer this early model intact. Second photo. $245.00 (UPS ground S&H = $18.00) Inventory #WE35/BGT