1940's Radio Transmitter - The ART-13 Restoration Introduction!

[@MrCarlsonsLab]

To learn electronics in a very different and effective way, and gain access to Mr Carlson's personal designs and inventions, visit the Mr Carlson's Lab Patreon page here: www.patreon.com/MrCarlsonsLab

[@dougtaylor7724]

My uncle tried to volunteer for the army three times in WW2. He was the sole supporter or six people and 34 years old. The army said no way we can take you. He went back the fourth time. Finally the recruiter realized he doesn’t understand what no means, he asks what line of work are you engaged in. He told them he repairs radios. Fast forward 12 months and uncle is an instructor for Bomber radio operators. After they learned code and communication principles they had a short course on in flight radio repair and testing. The school was only 30 miles or so from uncles house. He was a contractor and never officially in the army. Told me back when I was a kid in the 70’s how he enjoyed meeting all the young men from every corner of the country. But when he mentioned how many of those guys probably never made it home, he clammed up and changed the subject.

[@MrCarlsonsLab]

Thanks for sharing your story Doug!

[@Aswaguespack]

My dad’s oldest brother was a machinist at Dover Army Air Corp Base during WW2. They were training bomber pilots to send overseas. The training was rough on this big birds and he said they put in many 12-18 hour days fixing those big bomber trainers to keep them flying. He said every part of those war birds took a beating from the trainees. My uncle Donald said they frequently just slept and napped in the big planes they were working on. He said did everything on the planes except the radios. There were other guys who only worked on the radios but the machinists did everything else. Boy he had lots of great stories. Their job was so important in the war effort then. They really were the Greatest Generation.

[@eegles]

If you want an account of what it was like for bomber crews over Europe, look up Bert Stiles, "Serenade to the Big Bird." Sobering read. He completed enough bomber missions to come home and switch to something like training, but he decided to switch to flying fighter planes and died at age 23 in a dogfight crash.

[@Aswaguespack]

@@eegles thanks for that suggestion, I’ll definitely look it up. I had a college professor who was the pilot training the young pilots to go overseas until a young pilot made a serious goof and crashed his bomber trainer, put him in intensive care, and got him a steel plate in his skull but he met and married his nurse and they lived happily ever after.

[@dougtaylor7724]

@@eegles Dads brother made group leader around his 22nd birthday. He was shot down 3 times before he died on mission number 26. He was quite a letter writer and my dad was able to see him while on a pass several times while they were in England. I know many things about Bomber crew life. Heard some terrible stories of fire bombing raids and removing a dead tail gunner with a mop. The poor man bailed out in the channel his first mission. There was nothing easy about being a bomber crew member. The percentage of losses were higher than a marine in the Pacific. We owe those men a lot. The only thing my family has to prove the man ever existed is his casket flag. All the people that knew him have passed away. As you can imagine, that flag is my most treasured possession.

[@BruceBoschek]

That is the cleanest ART-13 I have ever seen! I bought one from Newark Electronics in Chicago in the late 1959s. Unfortunately, I was never able to get it to transmit, but I was only 17 and all alone. Looking forward to seeing this one come alive in your able hands. Thanks.

[@QARepair]

Your English voice is the best what I ever Heard, sorry - I'm not English but you are a genius person. Thank You for sharing your knowledge

[@imkds55]

As a 16 year old novice, I didn't have a dynamotor for my ART-13, so I tried to build a power supply to power it. The first part of the supply was for the motors and filaments. I had a sealed low voltage transformer with a dozen or so taps on the secondary. I would apply 120VAC to the primary, rectify the secondary and apply it to the transformer and check the voltage to make sure that under load I was supplying the 28V to the transmitter. Once I had it right I started playing with the auto-tuning. After about 10 minutes, the sealed transformer decided to give up the ghost and exploded. Imagine the sound of a 30.06 rifle indoors! All of the molten tar inside the sealed transformer blew all over the walls and ceiling of the room I used for my ham shack, and my parents weren't very happy with me. That was when I learned about the VA rating of transformers, and not exceeding it. A very valuable lesson.

[@jamesrogers47]

You should build a turntable for your bench to facilitate rotating the equipment you're displaying and servicing.

[@IanScottJohnston]

Yup, a Lazy Susan

[@Skibidi_Male_X]

Def would have added a lot more lighting for that table and equipment it's always so dark

[@K7MD]

I made a couple for the workbench. Spin around too easy, I had to add manual friction brake so I could lock them down while working.

[@jimdavis6833]

@@Skibidi_Male_X Turn up the brightness on your screen.

[@kylefafnis]

Idk what you're seeing, MCLs lighting and sound are always spot on

[@jimw7ry]

6:20 All this OLD RADIO GOODNESS!! Indeed Paul! Indeed....

[@gregorythomas333]

Wow...such a treat! I've never seen inside one of these before...thank you Paul :)

[@MrCarlsonsLab]

You are very welcome!

[@richardmassoth8237]

I used to work with military surplus radio gear back in the late 1960s and into the 1970s with a buddy while we were in high school. We were also shortwave listeners and ham radio "newbies" or "wannabes", who worked on WW-II radio gear. Those plate caps in a transmitter or some receivers were not just a HV risk, but could also cause RF burns if you didn't watch your distance and how the RF shielding was handled. Especially if you keyed up a transmitter in "tune" mode with the shielding open. You are so spot-on with the different tube indexing systems. This could be the subject of an entire video about all of the different approaches to how vacuum tubes have been indexed or connected in antique radio gear. And the pitfalls of handling such tubes. A tube with a base could be a disaster waiting to happen if the glue between the glass envelope and base has failed from heat and/or age. There were a number of dynamotor (or motor-generator) to shore power conversion kits or recommendations in the radio magazines and ARRL literature at the time. But some of the best times was just to go and absorb all that we could from some of the MARS operators in the area who were willing to be an elmer to young radio operators. These MARS and AF-MARS folks had all kinds of gear that we couldn't get from commercial military surplus companies, like weather satellite decoders, teletype units and big, portable or mobile power generators (often motor-generators that would supply AC and/or DC for emergency radio communications) that even came with their own pup-tent for "all weather" operation.

[@NigelDixon1952]

When I was a kid in the 60s, Paul, Meadow Lane, in Leeds was the place to go. I was lucky enough to live close enough to visit some of the UK's best l forces surplus stores, mostly every Saturday! For me it was like entering a magic Kingdom, filled to the rafters with WWII goodies. Some of the TX/RX equipment was still boxed and brand new! I would have been 12, and my bedroom was creaking! One of my radios was the 31 Set, which used the low VHF 50 Megs band, also used by BBC TV. I blacked out the 6 PM news for my whole village! Keep the memory of such wonderful equipment alive, Paul, you are doing a fantastic job!'

[@JamesPotts]

Very cool to see a piece of Collins history.

[@jimmiller9330]

I used to have an ART-13 55 years ago as a 19 year old. Got it through MARS, built power supply and got it all running. An amazing transmitter in its time.

[@resipsaloquitur13]

Good Morning!! Saturday just got better!

[@cleophusA]

I've wanted an ART-13 since I was a teenager, (about 50 years ago), and never ran across one in good unmolested condition for a price I could approach. I will definitely be living vicariously through you on this restoration!

[@GoodLuckBP]

Radios of today are so much easier to use than back in my Father's day! Imagine the power consumption of all the Hams today using radios that consume that many amps for both the receiver and transmitter! If I plugged that transmitter in my house I believe the street lights would dim! Thanks Mr Carlson, your videos are the best.......Long time Ham.....

[@AndreaLiverani-iw5ci]

Wow wow wow …. My art-13 is in a storage from so many years together with the bc-348 I will follow your restoration and I want to do the same with my station… you are great!!!!!!!

[@mikefef]

What timing! I have 3 of them - 1 working, 1 possibly working and 1 to restore. :-) Now I have some incentive! ~K3FEF

[@jontallbacka9406]

Poul…. This project just shows the specific needs of basic/advanced understanding one needs to appreciate electronics🔥You are awesome🔥

[@josephsawicki9335]

This is going to be an incredible journey back in time Thanks Mr. Carlson

[@2006chame]

I really have fun and learn a lot from your channel, thank you!

[@MrCarlsonsLab]

My pleasure!

[@JimmytheCow2000]

Looking forward to that beautiful transmitter restoration. Thank you so much for the content.

[@MrCarlsonsLab]

My pleasure!

[@terrym1065]

RX and now TX w/PS...true beauty. We're going to see those long wires put to use shortly, should be a fantastic time. Thanks Mr C, amazing find the transmitter for the BC-348, it looks really nice on the inside. Looking forward to some restoration candy, gonna be sweet.

[@qqazws]

Love these videos on military vacuum tube electronics. Not only are they well built, they are also part of our history. Looking forward to watch the restoration stage videos .

[@vasil4oBG]

WOW!!! This is a treasure !!! I would love to put this transmitter in my shack! (I guess everyone here wish the same)

[@CGWWIIreenactor]

Hello Mr. Carlson, I just wanted to let you know that I am excited to follow along on this, and the BC-348 restoration, I am a WWII reenactor and I portray the U.S. Army Signal Corps., so this is right up my alley! I also just received my ameteur radio liscense, and with the knowledge I have learned from you, over KZbin and Patreon, I was able to restore a Hallicrafters S-40b and a E.F. Johnson Challenger for use as my ameteur station. In the future I will be working on WWII radios so that I can use them at events. (Right now I operate a BD-71 switchboard and run lines for EE-8 field telephones) Thanks for all the work you do in making these videos, I wouldn't have half the knowledge I do without them! -Carson G. KD9ZDD Wisconsin

[@MrCarlsonsLab]

Thank You for your kind feedback Carson!

[@adamberndt4190]

I'm in Milwaukee and was just curious, where and when do WWII reenactments take place in Wisconsin?

[@CGWWIIreenactor]

@@adamberndt4190 There is one reenactment coming up in the spring at Pioneer Villiage in Saukville, I'm not sure on the dates (this is a smaller event, but a fairly good one). From June 14-16, there is the "Old Falls Villiage WWII Days" in Menononee Falls, (This is a very good event, one of my favorites) if you would like to find more, just search google for WWII Reenactments in Wisconsin.

[@njgriebel]

I'm so excited for the new restoration videos! I absolutely love these kinds of radios!

[@kilcar]

Beautiful Lab. I like the countertop especially.

[@aandpman]

One of my local Ham buddies has this pair, and has been working to get them perfected. He takes them to ARRL Field day, houses them in a Mil style wall tent and does his best to keep them on the air. Can't wait to see this pair YOU have get restored!

[@Greg-et2dp]

Mr Carlsons lab your vintage ART 13 transmitter is awesome my friend 🎄

[@FloweryThoughts]

You're making me feel nostalgic for my Field Communications Electronic Equipment Mechanic courses at Ft. Sill way back in 1976. After graduation I never touched anything electronic again. I was sent to Ft. Polk where I was needed for the high tech job of moving the parking lot to the other side of the street by hand instead. They needed to segregate the enlisted peasants vehicles from those of the commisioned peasants.

[@Tomek-i3g]

This is how american capitalism really works...

[@micklaws5520]

Absolutely great that people want to learn and experience researching and repairing old RF power house equipment. The knowledge to do this is fast disappearing but there are those that want to keep this old tech alive and running. This equipment was built to last

[@gibbyrockerhunter]

Wow. Now that is some beautiful engineering.

[@Skyler_Hagen]

Looking forward to this project. I just ended up with an ART-13 and a BC-375E from SK ham (and Korean War veteran) who I was friends with. I plan to get both on the air, as he did, and would love to see an in depth analysis and restoration in your typical style!

[@jaredkusner1137]

This will be the best restoration yet. Looking so forward to all we will learn in this one. My note book is open and my pen is already smoking! I remember my uncle Bob telling me how he used radio in WW2 in the aircraft. May have been these same models.

[@martinsiebert1368]

A few years ago I used a Siemens E311b receiver with Hammarlund HX-Fifty in the shack. I repaired and calibrated both devices myself. A self-made frequency counter at the output of the transmitter helped to set the transmission frequency in the amateur radio band. Transmit and receive operation was switched with a coaxial relay in my antenna system. Radioing with tube technology is fun and I understand the whole thing. 73 Mr. Carlson

[@charlescartwright6367]

This transmitter and receiver were taught in my USN "AT-A" school back in the late 50's. the mechanical one way clutches on the transmitter auto tune were amazing to watch and amazingly repetitive.

[@Yosemite_Sam]

I have an ART13 and would like to see more videos on this transmitter. Great video.

[@ominguti6345]

Can't wait for the restoration to come out. I have a similar piece of equipment (a military linear power supply) that has lots of hughe switches and stuff that I'm not sure how to clean properly. I'd love to see this before I do my restoration.

[@tikicowboy]

WOW WOW WOW!!! I'm so glad I stumbled on your channel. First for all the electronics learning info, I'm a total beginner. And now a TX/RX restoration of the exact ART13/BC348 I am hoping to restore with the knowledge I gain from your channel and Patreon membership 😁 THANK YOU, and I hope I can understand everything you are teaching us. I plan to use the dynamotor for both the ART13 and the BC348 just to be true to it originality. Let the learning begin.

[@MrCarlsonsLab]

Welcome aboard!

[@kristyskirt9015]

Must say Mr. Carlson has the "HOTTEST Toys around. This is going to be really fun with Paul "ON THE AIR" be cool to have a vetrain be a guest Ham Opertor with Paul or make contact with some vets. Always fun stuff at Mr. Carlson"s Lab. Take care Mr. Carlson Best Kristy

[@telemaster7791]

It appears someone took good care of this equipment. It was really clean inside.

[@stevemercure902]

Looks like you could hook up the ART-13 and power supply and fire it right up. It is a beauty and I'm looking forward to watching this series. 73 de W5EN

[@leftovertech]

Many years ago, I restored a BC-348Q. Thus, I've seen a few Dyna-motors. That is one of the cleanest I have ever seen. Clearly, it wasn't just cleaned up by a previous owner. The lack of wear on the internals just screams "low hours". Congratulations on a spectacular find!

[@rachmielbenberel]

The ART-13: One of the most amazing pieces of radio hardware to come out of the Second World-War. It is my favorite piece of RF from that era. The B29 Superfortress usually had two ART-13 onboard!

[@richardmassoth8237]

And those avionics power systems were 28 VAC at 400 Hz (both nominal). Not standard "shore power" devices that would have made building a power supply so much easier. So, each of those ART-13 units had their own Dynamotor -- no sharing there! The harmonics would not synchronize with each other or the big radial engine power plants, so it was quite a noisy environment. Hence the need for those huge mica capacitors.

[@Tomek-i3g]

Because american capitalistic junk could stop working at every moment :)) So they used another in such case.

[@rachmielbenberel]

@@Tomek-i3g What you call "[A]merican capitalistic junk" was welcomed with open arms by the Stalinists--your heroes no doubt. Little drummer boys and girls such as yourself know little of history and even less concerning radio engineering. You'd be much better served keeping your Marxist blowhole quiet rather than showing readers your true 'Ballastexistezen' nature!

[@colinauta]

I used to own one of these ! I was in my final year of high school when I spotted some type of "army surplus" radio transmitter going for a song in the newspaper classified. After my dad and I brought it home I plugged it in. The thing sprang to life with a lot fanfare. Loud popping and whirring but that was all normal. The transmitter was mounted on the top of a tall rack with a massive custom made PSU (no dynamotor) underneath. It had heavy transformers and pair of impressive oversized mercury vapour rectifier tubes . My favourite feature was the high speed auto tuning mechanism. Sadly I couldn't use it for amateur radio purposes as I only had a VHF license at the time . I hadn't learned the morse code which was a requirement for a full HF band license at that time here in South Africa. Some years later for personal reasons I decided to get rid of all my gear so I gave the ART-13 away to a friend with similar interests. 😢

[@MrCarlsonsLab]

Thanks for sharing your story!

[@tedmoss]

I like that high voltage warning, when I was 14, I built a TX for a friend and after working all night, I got to close to the output tube cap when I was tuning it and got an RF burn on my thumb, a nasty lesson. In the USAF (1963-1967), I worked on Collins equipment ARC-3 in the C-47, ARC--27 and on the F-105 and other jets that were much newer, the Marines used to fly into our base to get us to work on their radios. I think I still have the diagram for the ARC-70. That's a beautiful set you have. WA7VQR

[@Tomek-i3g]

Do you ever use CW in the USAF?

[@gregargendeli2973]

acck! I had one of these but had to get rid of it when I moved, It was long-term project. This was Collins auto-tune radio. You set the dial positions with the locking bars (by the red paint) and the system would (via the channel selector switch) spin each dial to the previously locked setting. A kick to watch. But don't ever get them out of sync if you take them out of the radio.... It looks like this one does not have the low-frequency plug that let the radio operate (been a long time, but I THINK 1mhz to 2,5mhz). Good Times, can't wait to see this resto.!

[@JCWise-sf9ww]

We watch every new video you post. This grand receiver restoration series is getting more interesting, that we get to see what real professional radio equipment was like in the good old days. You inspired me, that I recently acquired two Hallicrafters radios, a S-36A and a SX-62 run 2, definitely grand class radio receivers. The SX-62 was restored by the friend I bought it from and the S-36A needs restoration.

[@barrybogart5436]

I had a 62A but I donated it to the SPARC museum when I moved from Vancouver, Fabulous sound and I could monitor six meters with it. Worlds biggest slide rule dial.

[@JCWise-sf9ww]

Thank you Barry.

[@flicewatter]

Beautiful piece of equipment..

[@peteshulver9221]

Great stuff Paul and look forward to the next step😊

[@leandrolaporta2196]

Yessss transmitters!! Much more fun than receivers!!❤

[@Greg-et2dp]

Mr Carlsons lab your utube videos are awesome my friend 🎄 ❤️

[@kd5byb]

NICE!!! I've got several of these waiting in my repair queue!

[@joernone]

Mr. C., That was cool as can be. I've never seen inside one of those old military aircraft rigs and surely never inside a dynomotor, and probably never would have. Thank you, my friend. Regards, John

[@MrCarlsonsLab]

Thanks for your kind comment John!

[@barrieshepherd7694]

Looking forward to operation - and the dynamotor running. I always consider a dynamotor as a DC transformer.

[@fordsrestorations970]

I grew up around the Air Force Base, I remember all the World War II guys even a few of the World War I , also I hung around astronauts in training. I got the play in the airplanes like they were toys also all the space training equipment where my toys. I never abused or damaged any of it because I thought that was so cool . The X-15 was my inspiration and I love the SR-71 72 and don't forget about the UFO technology .

[@howardbond6639]

Thank you for this, and all the other videos, I will be looking forward to seeing this restored and on air. I use one regularly on our four AM nets in Brisbane AU and paired with the Stromberg Carlson BC348P .However not with the Dynamotor these days.

[@LeeBlaske]

Excited to see this fixed up and in operation. It looks so clean, it kind of looks like it's ready to go. The automatic, motorized tuning on these is also unique. I bought two of these after watching the "B-29 Frozen in Time" episode on Nova, years ago. I spent some time cleaning them up, but decided I really didn't have the space to operate and display them properly, so I sold them. At the time, I had also purchased a military depot 28 volt power supply that was absolutely enormous (required a 220 volt outlet). That power supply would have easily powered that dynamo. Never got that running, either. It actually kind of scared me because of all of the amperage involved. I can't remember the model number. Maybe it started with G?

[@vacuumfireradio253]

Really looking forward to this renovation. I hope to get one soon to run with my BC348s. Excellent!!!

[@challenger2ultralightadventure]

I look forward to the restoration and you operating. Maybe we will be one of your contacts? I live in VE4 land. Cheers and 73 from Winnipeg.

[@salliemorrill2671]

Looking forward to this restoration. Lots to learn. Thank you for your time and effort to make these vids. God bless.

[@JeepinBoon]

I had a Collins ART-13... What a BEAST!!!

[@nathkrupa3463]

Great and solid model sir wow nice work. 😮 Mr Carlson sir you are awesome good video 😊thanks for sharing this video sir ❤😊

[@MrCarlsonsLab]

My pleasure!

[@zappatx]

WOW!!! That is sooo cool. Especially that Dynamotor.. I'm a QRP guy but want a B&W AM transmitter one of these days. There was an excellent one for sale in Ft. Collins Co but they wouldn't ship it unfortunately.

[@Tom-W7TMD]

RF goodness bahahaha!! Love it! You could check in with us on 3885 here in the PNW in the morning! Looking forward to this build!

[@Greg-et2dp]

Mr Carlsons lab i wish you and your wife family and your family happy Thanksgiving and a merry Christmas 🎅 🎄 and happy new year 🤶 🎄 my friend ❤

[@jimgiordano8218]

This is a surprise, I can't wait to see this xmiter in operation.

[@ViniciusMiguel1988]

This is the most interesting radio so far that you will work for a while, even without seeing the schematics it looks quite different for the other radios!

[@smiffykuk]

Looks in nice condition… beautiful old kit. 😊

[@Alexelectricalengineering]

Wow, so awesome, can't wait to see it restored and running again!!

[@mackfisher4487]

Love WW-II boat anchors had command sets and a 348, but always wanted an ART-13 and the must have DY-17 the sound of a Dynamotor when you hit the T-17 microphone is sweet. Besides in a QSO you get to answer what's that noise.

[@anandarochisha]

ITS MR CARLSON RIGHT ON MY PHONE SCREEN !

[@Greg-et2dp]

Mr Carlsons lab you are good at restoring vintage shortwave receivers and alignment of vintage shortwave receivers with ssb my friend

[@kenmohler4081]

This thing is so clean!

[@phildurall7466]

Thanks Paul! I never had a Dynamotor, so, never saw inside one. Very cool! 73 - KF6IF

[@martinblain6200]

ALL of it Thank you. Excellent

[@CodfishCatfish]

Thanks for another really exciting video. I always wanted an ART13 but they are really rare in the UK and after seeing the full BC375 transmitter totally pristine, full kit with TU units for most bands, antennas, connecting wires and bags and webbing at Rosmalen in the Netherlands but it was too large to get in the car. Sold for 450€ and I was totally gutted as I secured some space for the trip back to the UK before Brexit and when I got back to the stall it had sold. Still looking for a decent ART13 or BC375/BC191

[@faxcapper]

Oh my my....going to love this!!!!!

[@4nk8r]

Can't wait till the day of this video . I've always been intrigued by the aviation communication transmitters and receivers. 🎉

[@pd1jdw630]

What an absolute beast! First look I thought. That looks complicated. Then I looked at my ts-590. And thought. Nah. Not that complicated. But I’d love to see one working. 👍🏻

[@ariedekker7350]

Thanks "OM" it is nice for me to see the technology involved. Greetings pe1krx.

[@stephaniewilley2224]

1930's - 40's technology military grade, very COOL !! I'm a big fan of that era's tech. Be sure to lube those armature bearings.

[@Turbo-Drew]

Awesome as Always...This is so exciting Thank you

[@markjurkovich7814]

Hello Paul. This is a great restoration project you have going on and I enjoy following it. I have an off-topic question, do you have a Collins receiver with the auto tune feature? If so, that would be another great restoration so we could see how it works. Thanks.

[@jaut-76]

I love this transmitter. I have one which I’ve restored and used on the VMARS radio net on 80m along side my wireless set 19 mk3. Greetings from the UK M7BLJ

[@markpetniunas198]

Hi, looks like fun project. Just use 2 car batteries in series for that dynamotor, those run on 25volts no problem.

[@MrMe4444444]

It would be cool to see a TCS pair done!❤

[@stirlingschmidt6325]

Super cool! It's a fitting tribute to 'ART-' Collins...

[@stirlingschmidt6325]

Would you let us know in advance what band you'll be on, and when? I'll bet you'll have a TON of folks wanting a QSO!

[@MrCarlsonsLab]

Will do.

[@waxore1142]

Oh a transmitter! Now you're speaking my language!

[@w.rustylane5650]

I think I'll just stick to my Yaesu 991a for my radio. I did have the MARS mod done on it so I can use it on 11 meters as well. Cheers & 73 from K9POW in eastern TN

[@LarryDeSilva64]

Always fun to watch those art13's as the tuning dials all revolved until you got to the frequency you wanted. My brother Ron NU6F restored his ART13 and it works great. They are a really nice Transmitter from that ERA. And his is also period correct running off the Dynamotor. Should be a neat restoration for you to do Paul.

[@artpeck9272]

I had a cousin in St. Augustine, Fl who was a big time ham operator. I remember being in his “shack” as he called it and seeing tubes that to my eye were at least 18” tall. I have now idea what that might have been but they were impressive.

[@TheDevice9]

That dynamotor reminds me of the generator on the 1952 Buick I had as a kid, only with a motor on the end rather than a pulley.

[@Strike_Raid]

I'm sure you already know, but you're not supposed to touch the glass of an 813. The oil from your fingers will stain the glass when it heats up and create a hot spot and stress the glass. Clean with alcohol before loading it up. I wouldn't touch the 811s either, but I'm just extra careful.

[@MrCarlsonsLab]

Who told you this? Is this some audio thing now? The glass of a real 813 is Absolutely Not affected by oil from fingers. I have been handling 813's for 40 years, never a stain.

[@Strike_Raid]

@@MrCarlsonsLab It was common knowledge back in the day. I’ve never known one to break either, but it was standard practice to not touch them. Same thing as you would never ever touch the glass of a 4-1000, and for the same reason. Maybe you aren’t running A3 much, so they don’t get super hot; but it’s not like touching one means it’s going to explode, just increases the risk of envelope failure over time so you make a habit of not touching them (or cleaning afterwards).

[@winky32174]

Love the dynamotor, what an unusual way to generate alternate voltages!

[@richardgoebel226]

The dynamotors were state of the art back in the day. Moving forward with time the aircraft and avionics manufacturers needed something better. Ultimately they incorporated 400 Hertz generators to run all the electronics they kept adding to each aircraft.

[@barrybogart5436]

807's and 813'so my! I was licensed in '57. I was a VHFer and just used Gonsicators and didn't have any experience with HF transmitters, so I am glad you are covering them. I did own Hammarlund and Halli BOs. I am curious about the dyno approach but wondered how the Gonsets could work from 12 (6?) V. Didn't they use a multivibrator to create square waves which were then filtered, transformed and rectified? I don't remember! I just remembered the noise. 73

[@KN6Ham-sv3nr]

Hi Paul - Just an idea but may be very useful for others who own this radio: A video about building a power supply for this radio. Most people who own this radio opt for a home brew power supply that doesn’t use the dynamotor (including myself). Would really enjoy to see how you would design a supply for this radio. Just an idea… thanks!

[@oliverw.douglas285]

The dynamotor reminds me of those used with early 2-way radios in the 1940's & 1950's. I think the power supply for the receivers was called a vibrator. The whole assembly filled the trunks of service vehicles.

[@kahlid-ataya]

as usual for my favourite channel like before watching 💯

[@petersvan7880]

Didn't know you are a HAM, same here PE1CKQ :) Great series! Poor soldiers needing to carry around this very heavy equipment.