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USA: Modelos del fabricante General Radio Company; Cambridge (MA)

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Modelo	Año	Categoría	Válvulas	Fotos			Foro	Coll.Pr.
Vacuum-Tube Voltmeter (Thermionic) 726-A [6Q7G]	1939	Equipment	3 - 955	5		8S
Strobotac 631-B	1939–53 ?	Equipment	3 - 631P1
Beat Frequency Oscillator 700a	1940 ??	Equipment	8 - 6J7	1		2S
Megohmmeter 729-A	1940–53	Equipment	1 - 1E5GP	10		2S
804-B	1941	Equipment	3 - 955	2		2S
Vacuum-Tube Fork and Power Supply 723-C & 723-P1	1941 ?	Equipment	1 - 1A5G	7		4S
Output Power Meter 783A	1942	Equipment		1		7S
Standard Signal Generator Type 805-A	1942	Equipment	10 - 1614	2
Wavemeter 566-A	1942	Equipment		3				$
650A Impedance Bridge	1942 ?	Equipment	3 - 6H6	7		14S		$
Capacitance and Reactance Meter 421A	1943 ??	Equipment	7 - 56			1S
Megohmeter 487A	1943 ??	Equipment	2 - 85			1S
Megohmeter 544A	1943 ??	Equipment	3 - 32			2S
Vacuum Tube Bridge 561C	1943 ??	Equipment				1S
Variable Air Condenser 539A	1944	Equipment		5
Microflash 1530A	1945 ?	Equipment	5 - 5T4	5
Impedance Bridge 650-AP	1945 ??	Equipment	3 - 6H6	6		10S		$
Output Meter 583-A	1945 ??	Equipment		6		5S
Vacuum Tube Voltmeter 1800-A	1945 ??	Equipment	9 - 6SU7GTY	10		7S
Capacitance bridge 716-c	1946	Equipment		1		6S
Power Supply 1261-A	1946 ?	Fuente-Al	1 - 6H6	6
Variable Inductor 107J	1946 ?	Equipment		1		2S
Variable Inductor 107K	1946 ?	Equipment		8		2S		$
Variable Inductor 107L	1946 ?	Equipment		3		2S
Variable Inductor 107M	1946 ?	Equipment		3		2S		$
Variable Inductor 107N	1946 ?	Equipment		3
Variac (various models)	1946 ?	Fuente-Al		1
Sound Level Meter 759-B	1946 ??	Equipment	4 - 1N5GT	5		3S
Sound Analyzer 760-A	1946–48	Equipment	4 - 1L4	8		2S
UHF Oscillator 857-A	1946–51 ??	Equipment	3 - 316A	9		8S
Standard Signal Generator 805-C	1946–61 ??	Equipment	10 - 6L6	4		5S
Standard Signal Generator Type 805-G	1947 ?	Equipment	10 - 1614	1
Capacitance Measurement Bridge 1614-A	1948 ?	Equipment		1
Output Meter Type 483-F	1948 ?	Equipment		3
Precision Wavemeter 724-A	1948 ??	Equipment	1 - 1G4G	5
Wave Analyzer Type 736A	1948 ??	Equipment	12 - 6C6	6
Amplifier and Null Detector 1231-B	1948–59	Equipment	4 - 1U4	1		8S
Amplitude Modulation Monitor 1931-A	1949 ?	Equipment		2		11S
Distortion and Noise Meter 1932-A	1949 ?	Equipment	8 - 6J5	21		17S
Standard Signal Generator 1001-A	1949 ?	Equipment	5 - 6C4	9		26S		$
Variac V-5MT	1949 ?	Fuente-Al		7
RF Vacuum-Tube Voltmeter 1802A	1949 ??	Equipment	1 - 1R5	1		1S
Vacuum-Tube Voltmeter 727A	1949 ??	Equipment	3 - 957			1S
Vacuum-Tube Voltmeter 728A	1949 ??	Equipment				1S
Standard Signal Generator Type 1021-A, 1021-AU, 1021-AV, 1021-AW	1950	Equipment		12		9S
VARIAC V-10M	1950 ?	Fuente-Al		10
GR874 to BNC male adapter	1950 ??	Diversos		2
Precision Wavemeter 724-B	1950 ??	Equipment		9
Variac Type V2-S33	1950 ??	Fuente-Al		4
Sound-Level Meter 1551-A	1950–56 ??	Equipment		1				$
Decade-Resistance Unit 510-AA /-A /-B /-C /-D /-E /-F /-G /-R	1951	Equipment		1		4S
Decade Resistor 1432-U /-K /-J /-L /-Q /-T /-N /-M /-P /-Y /-X /-Z	1951 ?	Equipment		21		4S	1F	$
Standard Inductor 1481-K	1951 ?	Equipment		3
Two-Signal Audio Generator 1303-A	1951–59 ?	Equipment	14 - 6SL7GT	1		4S	2F
Strobotac 631-BL	1951–61 ?	Equipment	3 - 631P1			7S
Sound-Survey Meter 1555-A	1952	Equipment		7
Voltage Divider 700-PI	1952 ??	Equipment		2
Unit Oscillator 1215-B	1953 ?	Equipment	1 - ECC81	2		12S
Comparison Bridge 1604-B	1953–56 ?	Equipment		5		2S
Variable Capacitor 722-MD	1954	Equipment		3
Beat Frequency Audio Generator 1304-B	1954 ?	Equipment	9 - 6SL7GT	1		6S
Impedance-Measuring Circuit 821A	1955	Equipment		2		18S
Megohmeter 1862-B	1955 ??	Equipment	5 - 12AU7	1		15S
Precision Capacitor 722-D	1955 ??	Equipment		2		2S		$
Standard Capacitor 1401-D	1955 ??	Equipment		1
Standard Capacitor 1409-M	1955 ??	Equipment		1		1S
Vacuum-Tube Voltmeter 1803-A	1955 ??	Equipment	3 - 6AL5	10
Variac 0-140V 5A	1955 ??	Fuente-Al		6
Variac Autotransformer W10MT	1955 ??	Fuente-Al		1		6S
874-VRL Voltmeter Rectifier	1955 ??	Equipment		1
Variable Capacitor 722-DQ	1956	Equipment		5
Bridge Oscillator 1330-A	1956 ?	Equipment	3 - 6AQ5	1
Precision Capacitor 722MEQ	1956 ?	Equipment		3
Vacuum Tube Voltmeter 1800-B	1956 ?	Equipment	7 - 9005	4		2S
Strobotac 631-BLS3	1956–61 ?	Equipment	3 - 631P1
Strobotac 631-BLS8	1956–61 ?	Equipment	3 - 631P1
Vacuum-Tube Voltmeter 1803-B	1957 ?	Equipment	3 - 6AL5	3		10S
R-F Bridge 1606-A	1957 ??	Equipment		6		8S
Impedance Bridge 1650-A	1959 ?	Equipment	4	3		9S
Sound-Level Meter 1551-B	1959 ?	Equipment	6 - CK512AX	2		8S		$
Octave Noise Band Analyzer 1558-BP	1959 ??	Equipment		2		6S
I-F Amplifier 1216-A	1959–65	Equipment	5 - 6CB6	5		7S
Oscillator 1208-B	1959–65	Equipment	1 - 2C43	5
Regulated Power Supply 1201-B	1959–65	Fuente-Al	3 - 12AT7	1		7S
Variable Air Capacitor 1602-P3	1959–65	Equipment		2
Voltmeter Indicator 874-VI	1959–65	Equipment		2
Admittance Meter 1602-B	1960 ?	Equipment		9		7S
Metered Variac Autotransformer W5MT3W	1960 ??	Fuente-Al		4
Random Noise Generator 1390-A	1960 ??	Equipment		4		1S
Sound-Level Meter 1565-A	1960 ??	Equipment		4		11S
Standard Capacitor 1409K	1960 ??	Equipment		1		1S
Variac W2	1960 ??	Fuente-Al		5
Variac W5	1960 ??	Fuente-Al		2		6S
Variac W20	1960 ??	Fuente-Al		3
Variac Autotransformer W2MT	1960 ??	Fuente-Al		3
Variac Autotransformer W5MT3	1960 ??	Fuente-Al		7		6S
Filter 1231-P5	1961	Equipment		5
Strobotac Electronic Stroboscope Type 1531-A	1961 ?	Equipment	2 - 5965	3		30S
IET Output Power Meter 1840-A	1962	Equipment		1		12S
Pulse Generator 1217-B	1962	Equipment		1		8S

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