Equipment information:

EICO Electronic Instrument Co. Inc. 722 Oscillator
Manufacturer:
EICO Electronic Instrument Co. Inc.
Model: 722
Date: 1962
Category: Measurement instruments
Group: Oscillator
Description: Variable Frequency Oscillator
Information:
                                    The Model 722 excels in every requirement for a truly
satisfactory VFO under the crowded conditions encountered
today in the Ham bands. It provides full coverage of the
five Ham bands from 80 to 10 meters in six ranges, the 10
meter band being covered in two ranges.
Basic design features include a low-heat silicon diode
doubler power supply, a buffer-multiplier output stage, a
very large and easy-reading slide rule dial, and a velvet
smooth and extremely reliable drive. Output is high enough
to drive any modern transmitter on all bands from 80 through
10 meters. A lever type spotting switch is provided on the
front panel.
High stability is achieved by carefully coordinated
electrical, mechanical, and thermal design. The oscillator
is an electron-coupled, series-tuned Clapp type,
incorporating a stable, slug-tuned coil and
temperature-compensating capacitors. Drift due to internal
heating of the tank circuit has been made negligible by the
choice of a high L to C ratio, which reduces the circulating
tank current to a very low value. The buffer-multiplier
stage performs as a "straight- throughTt buffer-amplifier on
80 meters, and a multiplier on all higher bands. It provides
excellent isolation between the output load and the
oscillator, as well as high output.
A VR tube eliminates any effect due to line voltage
variation. A rigid mechanical construction and the use of a
double bearing on the main tuning capacitor avoids
mechanical causes of frequency shift. Enclosure of the
frequency-determining elements of the oscillator in a
shielding compartment provides both heat isolation and
shielding from outside mechanical movements and body capacity.

These manuals are available for the above equipment:

EICO Electronic Instrument Co. Inc. -- 722 -- Service and User Manual
File name: Eico-7738-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 33
Size: 2.96 Mbytes (3102488 Bytes)
Language: english
Revision:
Manual-ID/Number: 66371
Date: 1962
Quality: Scanned document, all readable.
Upload date:
MD5: 66ef3fc745538c363346d4cf58fd4496
ed2kID: 86fc7f35f6e3619c6a54cebe9cc5690f
Downloads: 17 since 18 February 2016
Information:
Construction Manual

The following Construction Manual has been written to
carefully guide you through the construction of your kit. If
you follow all the instructions implicitly, and work
carefully without haste, you will be rewarded with many
years of fine performance from this VFO and a personal inner
satisfaction from a job well done.
Eico-7738-Manual-Page-1-Picture
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EICO Electronic Instrument Co. Inc. -- 722 -- Service and User Manual
File name: Eico-7739-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 16
Size: 1.97 Mbytes (2060873 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date: 1962
Quality: Scanned document, all readable.
Upload date:
MD5: 0b1bfbda7f2edfdb8fc1a02ec48a8a87
ed2kID: e70132815a1a128405adb3de2be88d5e
Downloads: 22 since 18 February 2016
Information:
SECTION I. GENERAL DESCRIPTION AND Page
SPECIFICATIONS
1-1.
Description...........................................................2
1-2.
Specifications.......................................................2
SECTION II. CIRCUIT DESCRIPTION
2-1.
General................................................................2
2-2. Operation of Clapp
Oscillator..............................2
2-3. Operation of Buffer-Multiplier............................3
2-4. Power Supply & Voltage Regulator.....................4
SECTION ΙΠ. OPERATION OF VFO WITH
TRANSMITTER..................................4
SECTION IV. MAINTENANCE
4-1,
General................................................................5
4-2. Case
Removal......................................................5
4-3. VFO Adjustments and Calibration......................5
SECTION V. EICO SERVICE POLICY
Service Consultation...........................................6
Parts
Replacement...............................................7
Factory Repair Service Local Repair Facilities Shipping
Instructions . .
SECTION VI. PARTS LIST
Eico-7739-Manual-Page-1-Picture
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