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Part 2 AUTRONIC-EYE: 1952 CLASSIC CAR ACCESSORY "Troubleshooting" - GM Chevrolet Vacuum Tubes [4K]

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CAUTION: when operating, this unit puts out 1000+ Volts on a wire which is literally hanging outside of the case of the amplifier unit. Do not attempt to do anything you see in this video; it is for entertainment only. You are at your own risk. Just watch and enjoy looking at this old tech, the Guide Autronic-Eye from 1952.
Let's troubleshoot this vacuum tube Autronic-Eye for this 1953 Classic Car.
High Tech for your car in 1952. Let's take a look at this classic car optional accessory from 1952. It is used to automatically dim the car's headlights due to the lights from on-coming cars. It does this with a high voltage Photomultiplier Vacuum Tube.
Due to the available technology at the time, the voltage required for this design to work is very high.
This system was originally introduced by GM on Cadillacs and Oldsmobiles in 1952, then to the broader General Motors lines in 1953. This design was replaced as newer technologies were developed but was discontinued in the early 1970s in GM cars except for availability for Cadillacs up until the late 1980s as "Guide-Matic". Each Eye unit was designated for certain models of GM car; this one is designated for a 1953 Chevrolet.
This came from GM's Guide Lamp division. Guide Motor Lamp Company, formed in 1906, formerly made acetylene lamps for early cars and then moved into electric lighting soon afterward. They were early innovators in headlight technology and the development of dual filament headlamps for "dipping", or lowering the beam.
NOTE: This is not instruction, it is for entertainment for people like me who enjoy watching projects and the experiences gained. Do not attempt to do anything in this video. If you attempt to do any of the things in this video you are at your own risk. I am using special tech-bench safety equipment not detailed here so don't take for granted you can just plug these old items in safely without them being checked and repaired correctly. Check out the link below to Mr Carlson's Lab video below.
ACKNOWLEDGEMENTS AND REFERENCES:
[note: am in no way representing how these folks have shown doing these things - I don't even know if they would approve.]
Thanks to shango066 for championing the approach of "fix it first", before mass re-capping. See shango066 for many examples of that approach.
‪@shango066‬
Awesome discussion of bench safety including variacs and isolation transformers by Mr Carlson's Lab (highly recommended):
• Tech Tips Tuesday, Iso...
‪@MrCarlsonsLab‬
Modification method for a commercial Tripp Lite isolation transformer for tech-bench use by Todd Harrison, his channel is called ToddFun:
• ToddFun.com: Isolation...
‪@ToddFun‬
People who may find this video interesting are those interested in antique or classic cars, vacuum tube electronics, tube radios, tube televisions, 1950s technology, repair or restoration of vintage electronics, phototubes, obsolete technology, Chevrolet, Cadillac, General Motors history
Camera: Canon G7X Mark III
Mic: Rode Micro
Video Editing Software: Power Director
Video Editor: just me

Опубликовано:

4 сен 2024

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Комментарии : 9

@jimnewman5596 Год назад

Thats a bummer that the PMT is defective, great job on bringing the vibrator back to life.

@PracticallyFixed Год назад

Hi Jim, thanks. I was hoping to be able to get that vibrator running again. That was an old mechanic's trick I tried there. Will see what we can try next; I don't like to give up, but it does happen. Thanks again for commenting.

@hestheMaster Год назад

Many test leads are rated for 300 Volts but some say 600 Volts and those are really only safe with thicker silicone insulation. Last test shows bad phototube. Not surprised.😖

@PracticallyFixed Год назад

Thanks for watching and commenting. I'm not going to give up yet. Leads: yes, plus I think the 5+ amps going through these leads when I was working on the 6V car radio may have damaged some of them as well. They sure got hot. The construction of these leads is poor; the gator clips had just some crimps on the wires which were not secure. I went in and soldered a dozen of these later and they work much better. I still need to get some better leads. Thanks again.

@ElectromagneticVideos Год назад

Hope its not the photomultiplier! I was just thinking - wonder why they didnt use a cadmium or zinc sulfide photoresistor as the sense element. I'm guessing the trip point on those devices woul vary too much with the temperature extremes in cars. The photomultiplier is also more sensitive - but probably way more sentitive than needed.

@PracticallyFixed Год назад

Not going to give up yet. There will be a Part 3. I don't know the answer to the question about the photoresistor, although I have been looking through some history of the design since when you asked. Seems they did go to a different design photomultiplier which had the photocathode on the end so the orientation changed, but surely they went to a photoresistor at some point well before the late 80s I would think. Haven't found the specifics on that yet however. Thanks for commenting as always.

@ElectromagneticVideos Год назад

@@PracticallyFixed I know they could do photoresitor+tube relay control back then. I had a used electronics kit as a kit that had a 12K5 low voltage space charge tube that could run at 12V on the plate (designed for car radios) although the kit ran it at 24V. I think the photoresitor was zinc sulfide but could be wrong - it had very high resitances but worked perfectly. I'll have to look if any of your videos have a car radio with the 12V space charge tubes. Apparenly they were designed to do away with the vibrator while providing high enough frequency operation for the RF and IF stages beofe transitors could do that. But very low power due to low plate current so I think the idea was to have transistors driving the speaker.

@PracticallyFixed Год назад

The only tube car radio I currently have a video for is the '53 Chevy which uses a vibrator power supply for the tubes which run at or above 200V at the plates. Since those photoresistors were available then then it may have had to do with either cost, supply, or suitability for the application as you mentioned, light, heat, moisture, etc? Regarding the radios, was discussing a 1961 Buick hybrid car radio with one of my viewers recently which used 12V tubes as you mention, so the 12V supply was used for the heaters as well as the plates. The tubes were 12DZ6 (RF); 12AD6 (Conv); 12EK6 (IF) and 12DS7 (Det-Aud). The plates for those were 11.1V. As you say, the speaker was driven by a DS-503 germanium PNP power transistor (I believe in a TO-3 case) through a transformer. Have not worked on one so I don't know much more about it however. Thanks

@ElectromagneticVideos Год назад

@@PracticallyFixed I think the major issue with the photoresistors would be senstivity to temperature - the semiconductor nature the cadmium sulfide or similar results in more electrons in the conduction bands as the temperature rises, and and less in the cold. The photo multiplier liberates a spray of electrons for each photon and unless red hot, I suspect the cathode is insensitive to heat. How cool you heard from some one with one of those radios. That is the space charge series of tubes! If you ever come across one it would a fascinating device to investigate.