Supreme Model 561 Combination AF and RF Metered Generator
The model 561 is an AF generator, RF generator, and frequency modulator, and according to Supreme, can provide any type of signal needed to test or align a radio receiver of the day. The generators can be used individually or in conjunction with each other. The 561 also has two vacuum tube voltmeters, one for setting percent of modulation, and the other for setting the carrier level of the unmodulated RF signal.
The audio generator's range covers 15 to 15000 CPS, and the RF generator's fundamental range is 65KC to 20.5MC, with an extended range to over 60MC using 2nd and 3rd harmonics (the updated model 666 claimed up to 120MC). And the RF output can be either amplitude or frequency modulated.
Supreme's explanation for using harmonics on high frequency RF ranges was that using harmonics of the more easily calibrated lower frequency fundamental scales was more accurate than adding high frequency fundamental ranges that are harder to keep calibrated.
Supreme's explanation for using harmonics on high frequency RF ranges was that using harmonics of the more easily calibrated lower frequency fundamental scales was more accurate than adding high frequency fundamental ranges that are harder to keep calibrated.
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The 561 was advertised in combination with a Vedolyzer or an Audolyzer as a complete dynamic signal analysis system. Now that I've found the generator I have all three instruments. There is also a booklet called "See The Signal" that details use of the 561 with the Vedolyzer.
The 561 first shows up in ads in 1939 and in Supreme's catalog for 1940. It is pictured with a leather handle on top of the cabinet and it's missing the Carrier Level control that later units have. The Supreme 1941 catalog shows the model 561 with an updated front panel that includes the Carrier Level control, and it now has metal handles on the sides. They also added $10 to the price tag. |
The 1940 Supreme catalog also states that the 561 was sold in an oak cabinet. 1946 was the last year it was advertised in oak and with the original black faceplate. In 1947 it had a new wrinkled gray color scheme in a steel cabinet with matching front panel.
The 561 was sold through 1947 and was replaced by a new model 666 in 1948, which is really the same generator in another new color scheme, and with the outdated 84 and 6F8 5-pin tubes replaced with 6SN7 and 6X5 octals.
The 561 was sold through 1947 and was replaced by a new model 666 in 1948, which is really the same generator in another new color scheme, and with the outdated 84 and 6F8 5-pin tubes replaced with 6SN7 and 6X5 octals.
Page created 12/27/2024
Last edited 12/27/2024
Last edited 12/27/2024
