MORNING STAR OBSERVATORY
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Supreme Model 576 RF Generator

This is one of Supreme's smaller signal generators from the 1940's. It has a chromed chassis just like its big brorher the model 561 and the exact same frequency range.

The combination of the model 576 wth the model 563 audio generator would duplicate some of the functionality of the model 561 combination generator, except for features like the continuously variable modulation audio and the FM modulator. The 576 can only be AM modulated with a fixed 400CPS tone.
Picture
It's dirty and needs cleaned, as usual, but overall it's in pretty good shape. The case will also need repainted.

Picture
The face looks good, except for all the dirt, and there's just a small scratch or two to touch up.

​This instrument is a fairly early serial number 191. It's circuit varies slightly from the 1945 schematic available online: the line fuse is before the power line filters and the capacitor across the modulation transformer is 0.012mfd instead of 0.02mfd as shown on the schematic.

Picture
There's three tubes, a 6X5 rectifier, a 76 audio modulator, and hidden behind the black RF coil support is a 6A8 RF oscillator and buffer.

This small generator has an AC line fuse but their top of the line 561 doesn't. You'd think it would be the other way around.

Picture
The side view shows the 6A8 under the shield for the RF coils.

​The chromed chassis is a really nice feature, and the chrome is still in decent condition with just some light pitting.

Picture
The underside looks original. Most of the resistors measured out of tolerance and I count seven paper and foil capacitors top and bottom that need replaced. Plus the dual 8mfd electrolytic has to go.

The inductor on the left is the power supply choke, and the one on the right is the modulation transformer.

Picture
The generator came with the original output cable still plugged in. But its shell was bent and now I see the socket is busted too, so the generator must have been dropped on its face or something smacked the connector hard (like most gear I buy online, seems there is always undisclosed issues).

Picture
Inside the shielded multiplier can there are three 910Ω resistors and four 100Ω just like the attenuator in the model 561. The 0.02μF capacitor is in series with the output line and prevents external DC voltages from overheating the attenuator resistors.

​Someone has opened, or tried to open, the can because the edge around the back half is all bent up.



More to come...

Page created 5/6/2022
Last edited 5/7/2022
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  • Home
    • About
    • Contact
  • Astrophotography
  • The Observatory
    • The New Observatory
    • - About the ExploraDome
    • - About the Lancaster Dome
    • - Building the Lancaster Dome
  • Equipment
    • CCD Cameras >
      • Orion Starshoot Pro
    • Mounts >
      • Orion HDX110 (EQ-8)
    • Telescopes >
      • Astro-Tech AT6RC
      • Celestron C-11 XLT
      • Zhumell 152mm Refractor
  • Projects
    • C11 XLT Mods
    • Orion SSPRO Camera >
      • Disassembled Views
      • Noise Reduction Mod
      • Temp Controller Mod
    • Ultima 8 Mods
    • Zhumell Refractor Mods
  • Non-Astronomy
    • Amateur Radio >
      • Boat Anchor Radios >
        • BC-348N Receiver
        • Collins 51J4 HF Receiver
        • R-392 HF Receiver
      • DIY >
        • Station Boom Microphone
      • Ameco >
        • Ameco AC-1
        • Ameco OCM
        • Ameco PT-2
        • Ameco R5A
      • Heathkit >
        • Heathkit SB-102 Station
      • Knight-Kit >
        • Knight Kit Span Master II
      • Yaesu FT-817 >
        • Yaesu FT-817ND
        • LDG Z-817 Autotuner
        • Windcamp LiPo Battery
    • Antique Radios >
      • Building A Radio Workbench
      • Radio Dial Neon Clock
      • Radios >
        • 1938 Zenith 6-S-254
        • Echophone EC-1
        • Eltz Radione 2
        • Panasonic RF-5000A
        • Silvertone Model 4465
    • Geiger Counters >
      • AN/PDR-27G Radiac Set
      • Lionel CD V-700 Geiger Counter
      • RCA WF-12A Geiger Counter
    • Test Equipment >
      • DIY Test Equipment >
        • DIY Curve Tracer
        • DIY Signature Tracer
      • Military Test Equipment >
        • BC-221-AF Frequency Meter
        • LM-21 Frequency Meter
        • TS-323/UR Frequency Meter
        • TS-465 C/U Sweep Generator
        • TS-505D/U VTVM
        • TV-3C/U Tube Tester
      • Tube Testers >
        • Alternating Current Sink
        • Drug Store Tester
        • EMC Model 200 Tube Tester
        • Hickok Model 6000A Tube Tester
        • Hickok OZ-1 (550X)
        • Precise Model 111 Tube Tester
        • Precision Model 10-12
        • Supreme Model 385
        • TV-3C/U Tube Tester
      • VTVMs and Multimeters >
        • B&K Model 290 Hi-Low FET Multimeter
        • Hickok 225K VTVM
        • McMurdo Silver VOMAX 900
        • Micronta 22-220 FET Multimeter
        • Simpson 360-2 Digital FET DMM
        • TS-505D/U VTVM
      • Hickok >
        • Hickok 19X RF Generator
        • Hickok 225K VTVM
        • Hickok 288X RF Generator
        • Hickok OZ-1 (550X)
        • Hickok 6000A Tube Tester
      • Simpson >
        • Simpson 360 DMM
        • Simpson 360-2 DMM
        • Simpson 480 Genescope
      • Supreme Instruments >
        • Supreme 385 Automatic
        • Supreme 560 Vedolyzer
        • Supreme 560A Vedolyzer
        • Supreme Model 561 AF/RF Generator
        • Supreme's Model 562 Audolyzer
        • Supreme Model 562 Audolyzer circa 1941
        • Supreme Model 562 Audolyzer circa 1946
        • Supreme Model 563 Audio Generator
        • Supreme Model 576 RF Generator
      • Other Test Equipment >
        • Rider 162 Chanalyst
        • Tektronix 326 O'scope
        • VU-Data Model 941B Oscilloscope
    • ---------------
    • Fossils
    • Rocks and Minerals
    • Star Trek >
      • Star Trek Rock Mood Lamp
      • Star Trek Communicator