Electronic Instrument Company (EICO)
EICO began marketing test equipment kits in 1945 and was, along with Heath, one of the dominant players in that market. They later expanded into other types of electronics such as amateur radio equipment.
EICO Model 145 Multi-Signal Tracer ca. 1954
This tracer has a germanium diode in the probe and can trace both AF and RF signals without a mode switch. Since it has a high-gain amplifier and a decent-sized speaker the 145 is a pleasure to use. Jacks are provided for a VTVM. Mine is factory wired - the serial number beginning with "W" distinguishes factory wired sets from the kits. 1954 Radio Shack catalog prices are: Kit - $19.95, Wired - $28.95.
EICO Model 249 Peak to Peak VTVM ca. 1965
The 249 and its brother, the smaller 232, were among the most successful of the EICO instruments. They measured DC volts in six ranges from 1.5 to 1500 volts with an input resistance of 11 megohms and an accuracy of +/- 3% of full scale or better. AC voltage measurements could be read as RMS on the same ranges or as peak-to-peak on six ranges from 4 to 4200 volts. AC measurements had an input resistance of 1 megohm shunted by 60 pf, with an accuracy of +/- 5% of full scale or better and frequency response from 30 Hz to 3 MHz. The ohmmeter function measured 0 ohms to 1,000 megohms in seven ranges from Rx1 to Rx1Meg. 1955 Radio Shack catalog prices are: 249 Kit - $39.95, 249 Wired - $59.95; 232 Kit - $29.95, 232 Wired - $49.95. The 232 / 249 owner's manual and service bulletin are online at the BoatAnchor Manual Archive.
EICO Model 625 Tube Tester ca. 1960
I used this tester for years, until about 1978. It is just an emission tester, but it handles just about any receiving tube from 4 pins to octals, loctals and miniatures. 1957 Radio Shack catalog prices are: Kit - $34.95, Wired - $49.95. The 625 owner's manual is online at the BoatAnchor Manual Archive.
EICO Model 950B Resistance Capacitance Comparator Bridge ca. 1965
This 60 Hz bridge uses an eye tube as a null indicator. It measures capacitance from 10 pf to 5000 uf and resistance from 0.5 ohm to 500 megohms. Resistance, capacitance and inductance can be measured by comparison to an external standard. Capacitor leakage can be evaluated in two ranges at up to 500 volts. The electrolytic leakage range reads directly in power factor. 1971 Newark catalog prices are: Kit - $29.95, Wired - $44.95. The 950 owner's and construction manuals are online at the BoatAnchor Manual Archive.
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