General Radio Equipment

General Radio Model 1840-A-GRY "Digi-Bridge"

(EQP) GR1840A

**General Radio**Model 1840-A-GRY "Digi-Bridge" automatic digital LCR test system. Type 1840-A output power meter is basically a multi-tapped audio-frequency transformer with a fixed secondary load. The fixed secondary load is reflected to eight identical primary windings. A front panel switch connects the eight primary coils in four different series and parallel combinations, and each primary combination is used with any one of six secondary taps, thus providing 24 different primary impedances. Each of these 24 impedances can in turn be multiplied by 250 with a second front panel switch. The end result is a total of 48 primary impedances. The use of grain-oriented silicon steel in a laminated core yields a 20-watt rating with a relatively small core. Interleaving of primary windings with secondary windings in two separate PI's permits measurements from 20 to 20,000 cps.

**Measures**: 8" x 12" x 4"H. Includes copy of the operation manual.

$489 each

Megohm Meter

(EQP) GR-1862B

**General Radio**Megohm meter. Consists of a regulated power supply, a complement of resistance standards and a balanced DC, vacuum-tube voltmeter with very high input resistance. Test voltages available are 100v DC and 500v DC. Resistance range 0.5 megohm to 2 t-ohm at 500v; 0.5 megohm to 0.2 t-ohm at 100v. 6 decade ranges. Accuracy is ±3% of indication at low resistance of each decade to ±12% (accuracy to which scale can be read) at high resistance end up to 50,000 megohm; possible additional ±2% error at top decade. The voltage can be removed from terminals by setting of either switch to discharge position. 9" x 9.5" x 11"H.

$389

Vintage General Radio Variable Wire Wound Resistor

(RWV) 544-314

Vintage

**General Radio**variable wire wound resistor. Inductive, 37.8 ohms, 1%. Phenolic core, 3 solder tabs. 2.78"L x 2.12"W x 0.095" thickness. Sealed in Mil-spec package. DC: 12/1965. Alt. P/N: 0544-3140. NSN: 5905-00-858-7210.**NOTE**: Part of resistor assembly in**General Radio**544-B Megohm bridge.$10 each

Pulse Transformer

(TPA) 1531-2000

Mil-spec pulse transformer with resistor. Enclosed. OEM part for Genrad 1531-AB series stroboscope. 2 threaded hole mount, 4 turret terminals. 1 primary and 1 secondary winding. No other specs available. 1.5"L x 1.5"W x 1"H. DC: 9/86. NSN: 5950-00-772-5672.

$89 each

Constant Impedance Trombone Line

DC-2 GHz / 50 ohm

DC-2 GHz / 50 ohm

(RF) 874-LTL

**General Radio**constant impedance trombone line. Type 844 LTL. DC-2 GHz, 50 ohm. 44 cm (half wavelength @ 340 MHz) adjustment. SWR: < 1.10 to GHz, < 1.25 to 2 GHz. 24" x 33"L (61 - 83 cm), 1.1875" (30 mm) spacing between centers. NSN: 5985-00-922-6219.

$375

General Radio GR900 Precision Tuner

1 - 8.5 GHz / 50 ohm

1 - 8.5 GHz / 50 ohm

(RF) GR900-TUA

**General Radio**GR900 precision tuner. Use to match out small residual reflections in low, SWR measuring instruments. 1 - 8.5 GHz, 50 ohm. GR900 connectors.

$575

General Radio 1021-A

Standard Signal Generator

Standard Signal Generator

(EQP) GR1021P2-P1

**General Radio**1021-A standard signal generator. 250 - 920 MHz, 0.5 µV to 1 volt output at 50 ohms. 0 - 50% AM modulation. Operates on 115 or 230 vac, 50 / 60 Hz, 50 watts. Output via 874 connector. Line cord not included. 14-3/8"H x 20-1/4"W x 10-7/16"D.

$350 each

General Radio 583A

Audio Wattmeter

Audio Wattmeter

(EQP) GR-583A

**General Radio**583A audio wattmeter. 5 mW full scale. 2.5 to 20,000 ohms impedance. In fair condition. First designed in 1933.

$150 each

General Radio Filter for Unit Null Detector

(EQP) GR1212-P2

**General Radio**filter for unit null detector 1212-A. 1 Mc. 200v max input. Type 874. "GR" connectors and bround post on each end. Made in the USA. Circa 1963.

$125

General Radio Locking Air Variable Capacitor

40 - 150 pF

40 - 150 pF

(EQP) GR1607-P3

**General Radio**locking air variable capacitor. 40 - 150 pF. GR-874 connector. Made in the USA.

$125

General Radio Standard Air Capacitor

(EQP) GR1401-A

**General Radio**standard air capacitor. 100pf ±0.2%. 1,500v max peak.

$119 each

General Radio Variable Air Capacitor

(EQP) GR1602-P3

**General Radio**variable air capacitor. 15-75pf. For use with 1602-B admittance meter in 40-150 mHz ranged. 2.6"D x 5.4"L.

$125 each

Unit IF Amp

(EQP) GR-1216A

**General Radio**unit IF amp. Pairs with CNT detector. July 1961. The purpose of this unit is to serve as part of an RF null detector that rejects noise and interfering signals. It contains four IF amplifier stages tuned to 30 MHz. With the appropriate unit oscillator and mixer-rectifier it forms a sensitive heterodyne detector for VHF and UHF bridge measurements. Manual available on this page.

$295

General Radio Shielded Component Mount

(EQP) GR874ML

**General Radio**shielded component mount to GR-874 connector.

$95 each

General Radio 1218-A

Unit Oscillator

Unit Oscillator

(EQP) GR1218-A

**General Radio**1218-A unit oscillator. 900 MHz to 2 GHz. Output: 110 mW to 160 mW into 50 ohm load. Requires 300 vdc @ 70 ma and 6.3 vac @ 1 amp. Power cable connector is removed. 12" x 7-5/8" x 7-1/2". NSN: 6625-00-674-3284.

**Sold as-is**.

$95

General Radio 1654

Impedance Comparator

Impedance Comparator

(EQP) GR-1654/1782

**General Radio**1654 impedance comparator with 1782 analog limit comparator. Indicates difference in magnitude and phase angle between two external impedances, usually a standard and an unknown. 1782 Analog Limit Comparator gives Go / NoGo indication when sorting parts for within tolerance values of resistance, capacitance and inductance. 12" x 19-1/2" x 15".

**NOTE**: For parts only. Missing inter-connecting cables and fuseholder caps. No power cords. One knob missing cover.

**Sold as-is**.

*** SOLD OUT ***

General Radio 1490-D

Decade Inductor

Decade Inductor

(EQP) GR1490-D

**General Radio**1490-D Decade Inductor. 1 mH to 11.11 Henry in 1 mH steps. Tolerance less than 2%. One binding post insulator is cracked. 8-1/2" x 4-1/4" x 15-3/8". NSN: 6625-00-553-7655.

*** SOLD OUT ***

General Radio

107L Variable Inductor

107L Variable Inductor

(EQP) GR-107L

**General Radio**107L variable inductor. 0.8 mH to 5.2 mH. 15 watts maximum power. 6-1/2" x 6-1/2" x 8-3/4"H.

$125

(EQP) GR-107J

**General Radio**107M variable inductor. 7 µH to 54 µH. 15 watts maximum power. 6-1/2" x 6-1/2" x 8-3/4"H.

$125

General Radio 1558-A

Octave Band Noise Analyzer

Octave Band Noise Analyzer

(EQP) GR1558A

**General Radio**1558-A octave band noise analyzer. 11 frequency bands from low to 75 Hz to 9600 - 19.2 KHz plus all pass. 44 to 150 dB input range. In fair condition. Battery accepts charge, unknown life. Service tag notes: "Will not calibrate". Sold as-is. No accessories available. 7-5/16" x 9-1/4" x 8-3/8".

$125

General Radio

Random Noise Generator

Random Noise Generator

(EQP) GR1390-B

**General Radio**1390-B random noise generator. 3 ranges. Output from 0.1 mV to 1v. 105 - 125 / 210 - 250 vac power input. 50 - 400 Hz. 12-3/4" x 9-3/4" x 7-1/2"H. No line cord. Appears to work. NSN: 6625-00-799-8999.

*** SOLD OUT ***

(EQP) GR1390-B-RM

**General Radio**1390-B random noise generator rack mount version of the above unit.

$95

General Radio 1234

SWR Meter

SWR Meter

(EQP) GR1234

**General Radio**1234 SWR meter. Appears to work but crack in meter cover. One nut and spacer missing on handle. 115 or 220 vac, 50/60 Hz power required. No accessories supplied. 7-15/16" x 9-1/4" x 8-3/8".

- 1 - 1.05
- 1 - 1.2
- 1 - 4
- 3.2 - 10
- 10 - 40

__SWR Ranges:__

$250

General Radio

Decade Resistor

Decade Resistor

(EQP) GR1433-9723

**General Radio**decade resistor. 6 dials. 0.1 ohm steps. Maximum resistance = 11,111.1 ohms. 17.3" x 3.5" x 5" deep. Weighs 4.5 lbs. Brand new in the original box!!

*** SOLD OUT ***

General Radio Decade Resistance Unit Switch

(EQP) GR-510-P3

**General Radio**decade resistance unit switch. Black phenolic frame with knob and dial plate, "0 - 10". Found in

**Genrad**1433 Series decade resistor.

$125

General Radio Variable Inductor

0 - 55 mH

0 - 55 mH

(EQP) GR-107M

**General Radio**variable inductor. 0 - 55 mH. 15 watts max power. 40 ohms DCR. 0.60 amps. 6-1/2" x 6-1/2" x 8-3/4"H.

$149

General Radio

Sweep Frequency Reflectometer

Sweep Frequency Reflectometer

(EQP) GR1641

**General Radio**sweep frequency reflectometer. 20 -1500 MHz. Excellent condition.

$1,975

General Radio Type 980 Decade Capacitor Unit

(EQP) GR-980-M

**General Radio**Type 980 decade capacitor unit. Mica dielectric decades with silvered mica molded elements. 0.1µF max capacitance, ±% accuracy. 0.01 µF capacitance per step. 500v DC, 100 kc. *Used GR1419-K decade capacitor*

$75

General Radio

0 - 20 dB Potentiometer

0 - 20 dB Potentiometer

(EQP) GR1521-P1

**General Radio**0 - 20 dB potentiometer for use with 1521-B Graphic Level Recorder. 5-1/2"W x 4-1/2"D x 2-3/4"H. 4 pin plug-in. NSN: 5905-448-5331. New, unused.

$35 each

General Radio

0 - 80 dB Potentiometer

0 - 80 dB Potentiometer

(EQP) GR1521-P3

**General Radio**0 - 80 dB potentiometer module for Graphic Level Recorder. 4 pin plug-in. 5-1/2"W x 4-1/2"D x 2-3/4"H. New, unused.

$65 each

General Radio GR-1140A

UHF Wavemeter

UHF Wavemeter

(EQP) GR-1140A

**General Radio**GR-1140A UHF wavemeter. 250 MHz to 1200 MHz. Butterfly capacitor and inductor thru a IN22 diode to a 200 µA meter.

$120

General Radio 1450-TAR

Decade Attenuator

Decade Attenuator

(EQP) GR1450-TAR

**General Radio**1450-TAR Decade Attenuator. 1 dB to 110 dB in 1 dB steps. 600 ohms, 1 watt maximum, ±1%, 0 - 1 MHz. 19" x 12-1/2" x 5-3/4".

$249

General Radio 1432-Q

Decade Resistor

Decade Resistor

(EQP) GR1432-Q

**General Radio**1432-Q decade resistor. Four dials, 100 ohm steps. 100 - 1.111 Meg. 100k ohm range: 2.3 ma, 10k ohm range: 7 ma, 1k ohm range: 23 ma, 100 ohm range: 80 ma. Dimensions: 4-1/4" x 12-1/2" x 3-1/2".

$295 each

Trombone Setter

0 - 50 cm Constant Impedance

0 - 50 cm Constant Impedance

(RF) 011-001

**Bishop Instruments**trombone setter. 0 - 50 cm constant impedance. Alt. P/N: 933-8150. General Radio P/N: 874-LTL.

*** SOLD OUT ***

General Radio Standard Capacitor

0.001 µF ±0.25%

0.001 µF ±0.25%

(EQP) GR-509-F

**General Radio**standard capacitor. 0.001 µF ±0.25%. Banana plugs.

$107

General Radio 1652-A

Resistance Limit Bridge

Resistance Limit Bridge

(EQP) GR-1652-A

**General Radio**1652-A Resistance Limit Bridge. 1 ohm to 1,111,111 ohms with internal standard. 1 ohm to 2 Meg ohm with external standard. Operates on 105 - 125 vac, 60 Hz, 30 watts. 19" x 8-3/4" x 12-1/4".

$295 each

General Radio

Inductance Standard

Inductance Standard

(EQP) WBM106M

**General Radio**inductance standard. Calibrated to 1.1 Henry. 150ma max. 6" x 6" x 6-1/2".

$95

General Radio 874-VC

Variable Capacitor

Variable Capacitor

(EQP) GR-874-VC

**General Radio**874-VC Variable Capacitor. 14 - 70 pF. In the original box.

$95

General Radio

Standard Inductors

Standard Inductors

(EQP) GR-1482-D

**General Radio**1423-D Standard Inductor. 500 µH, 0.1%. Resonant frequency 960 KHz DC resistance, 0.38 ohm. 6-1/2" x 6-1/2" x 8".

$249

(EQP) GR-1482-E

**General Radio**1482-E Standard Inductor. 1 mH, ± 0.1%. Resonant frequency 800 KHz. DC resistance 0.84 ohms. 6-1/2" x 6-1/2" x 8".

$249

Calibrated Susceptance

(RF) 874A

**HP**calibrated susceptance. "GR" connectors. 0.01 - 2.0 nH. 0 - 0.005 pF.

$95

General Radio Sound Level Calibrator

(EQP) GR-1552B

**General Radio**sound level calibrator. 2v @ 400C = 120 dB on 1551-B, = 110 dB on 1551-A. Made in the USA.

$95

General Radio Patch Cord

72 Ohm

72 Ohm

(EQP) GR-874-R33

**General Radio**patch cord. 72 ohm. 3 feet long. Banana plug termination and includes a GR874 connector.

$75

Standard Capacitor

500 pF

500 pF

(EQP) GR-505-E

**General Radio**standard capacitor. 500 pF (500 µµF).

$35 each

Standard Capacitor

0.001 µF

0.001 µF

(EQP) GR-505-F

**General Radio**standard capacitor. 0.001 µF.

$35 each

Standard Capacitor

0.01 µF

0.01 µF

(EQP) GR-505-L

**General Radio**standard capacitor. 0.01 µF.

$35 each

Crystal Diode Modulator

20 - 1000 Mc / 50 Ohms Input - Output

20 - 1000 Mc / 50 Ohms Input - Output

(EQP) GR-1000-P6

**General Radio**crystal diode modulator. 20 - 1000 Mc. 50 ohms input / output. Bias 4 volts max.

$75 each