Grand Receiver Restoration Series - The GE CX371 Part 2 - The Amplifier And Power Supply!
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- เผยแพร่เมื่อ 28 ก.ย. 2024
- Sit beside Mr. C. at the repair bench! Let's go over the amplifier and power supply chassis together. An in-depth schematic explanation along with some great Tech Tips! Let's test some of the factory components and see how "good or bad" they are, almost 65 years from their manufacturing date. Enjoy! For links, click the SHOW MORE tab below.
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: / mrcarlsonslab
Part 1 of this GE CX371 receiver restoration: • 1957 Barn Find Radio R...
Part 3 of this GE CX371 receiver restoration: • Radio Receiver Restora...
#learnelectronics #restorationvideos #restoration
![1940's Forestry Radio Receiver And Transmitter [Teardown With Circuit Description]](http://i.ytimg.com/vi/H7RKEDPUy-8/mqdefault.jpg)
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
Me and my cousin are going to a Swap meet June 5th 2022 Sunday morning at 8 am in Milwaukee
Other hobbys lisining to records CDs and fmstreo on my Yamaha reciver
Where the link to download the pdf.
Hey Mr Carlson, the 4K video is great, the 60P not so much, especially with slow-moving or mostly stationary scenes. 60fps is good for catching motion, but completely unnecessary and a waste of bandwidth for the type of content you produce. What’s worse, it may prevent those who would be able to watch 4K 30P from enjoying your show in 4K. For example, even my late model premium TV struggles to play back 4K 60P. Just thought you might like to know and adjust accordingly. C-ya!
@@greggaieck4808 se ne mogu olakšati posao je brat ja vas pitam da je brat je ljubav t
Paul, I don't know if you ever taught electronics to groups professionally, but I am always interested in your videos for this very reason. Your ability to explain not only the detail of how to do these repairs, but also the philosophy behind them and still make it all interesting shows me your teaching skills are outstanding. Looking forward to the next video.
Second that comment. I found this channel just trying to learn board level repairs for game consoles, but I've keep coming back because the videos and explanations are fascinating!
I just restored the glass panels of my digital dash cluster from my car and was thinking of how time consuming it would be to video and explain all the procedures. All my respect to how good you do it. By the way, I appreciate the rare look at under Chassi antique dust.
Yay for 80s digital dashes! My parents had an 86 camry with that awesome multi color VFD display in it. Nothing ever looked as cool.
@@matthiasmartin1975 that was some cool stuff.
I liked that ford used vfd dot matrix screens in their dash information centers till like 08 or so... I think the heavy duty commercial vehicles used it even a few years ago, I remember seeing it in a 19 model RV. but I think it has to be gone now.
As someone that's done both, it takes about 10x as long...
work in aviation electronics for 34yr,,this brings back memories l enjoy you videos you know your stuff.
Awesome walk through on the schematic. Anyone with basic electronic skills can follow you as we "look over your
shoulder". You explain things so well! Looking forward to part 3.
Even a Curious Marc shout out. Nice.
Loved how you went over the schematic with so much detail, every little random "what's that for?" resistor and capacitor. Thank you for making these fantastic detailed videos.
You are welcome!
Your tip on not necessarily 'hooking' wires to terminals - priceless. I have been doing it (guilt-stricken) for just a year or so. Now I have a blessing! Thanks!!
I've missed your long restoration videos! I appreciate all of your hard work you've put into your lab and equipment so we can enjoy these videos!. Tip for the day I've learned is to use string and go behind the knobs and wrap string around the 1/4 inch shaft to pull the knobs off. It puts all the tension on the center. Best regards!
I don't know the first thing about "Electronic Component's". But Mr. Calson's Lab is my favorite YT Channel.
Wonderful episode Paul....kinda of a master class on electronics....you do know this stuff inside out. Very excited to see part3.... Thanks again for all this knowledge. It is priceless! Cheers!
Dam that's a heavy duty well built receiver, I like that, Couldn't be in better hands, Mr. Carlson will have it working like new in no time.
The video work is so nice on these. It is no picnic getting that just right, and not so easy doing the rest of the editing/uploading etc....... Just want you to know I notice how good your production work is too.
Thanks Leonard! This video took TH-cam 12 Hours to produce. The video size was 71.1G (Gigs.) I may go back to 1080P as the the processing time is "WAY" to slow (at TH-cam.) This video could have been up at 10AM this morning in 1080P. Compressing the 4K file is possible before upload, but then what's the point if I'm going to reduce it's playback quality.... Then TH-cam compresses it further after I compress it. Looking like 1080P again.
@@MrCarlsonsLab please stay with 4k, enjoying the crisp picture on the tv br from Sweden
@@MrCarlsonsLab I actually was waiting as the video uploaded, as I found the processing video in the playlist.
@@MrCarlsonsLab I ran into a similar thing even with 1080P last time. 2 different processing times Low Res/High Res. I haven't tried the 4K. But that is excessive, 12 hours is brutal. I have always found your videos to be very easy to watch and enough definition to see the important stuff fine. Not only that it seems that I find one little thing I was unaware of in each of them.
@@MrCarlsonsLab I believe its worth it. The time youtube spends encoding 4K is not wasted I assure you. The clarity is great. It also is NOT just for the minority of users with 4k displays. Thanks to downscaling and the higher bitrate setting the picture to 4K on a standard FHD display graces us with "better 1080p" for lack of a better word. Of course if it takes too much time off your schedule maybe it's better to stay on FHD but as far as we as concerned; I believe we are a quite patient audience so a day or 2 of extra wait is not going to be then end of the world.
Will you fuse the 120 VAC input line? It could easily be hidden inside. Great work. You're a wizard at explaining the role of individual components in the schematic. Thanks for the great learning experience.
Your measured, methodical vocal cadence is inspiring. So many of us talk fast and say little (Elon being exception), or speak in confusing twists and turns, whereas your speech seems metaphorical of the scientific method.
Seeing Paul shout out to Marc made my day. Keep up the awesome content guys.
thanks for embarking on this great series. love this radio. anxiously awaiting the portion addressing the r390.
You are one incredible teacher. Even though I have a fairly thorough understand of this stuff, I still really enjoy hearing you explain how it works.
Love it when you go deep into a schematic.
Hi Paul. I know now why I have noticed, but avoided watching any of your videos. I'm probly gonna have to go & watch all of them now! I'm so far behind reading all the comments, & all the replies to the comments, & replying to a few comments, that if I parrot what's already been said try to bear with me ok!
Congrats mate on a fantastic video! Your clear explanation of the various circuit blocks & signal paths & interactions, components & their characteristics, performance, load & fault symptoms, as well as the repair itself, well geez, what else would I need to sit back & be thoroughly entertained for a while, besides that radio when you've finished fixin her up? I have a sparky mate who I can talk to about this electrickery stuff to some extent, but everyone else around me, well, eyes glaze over & heads nod & smile...you know. But here finally there's someone to talk to, so youse are probly stuck with me now.
I had a real nice big old bakelite cabinet Astor valve radio I had been kinda restoring (over the last 40 years) that got cremated in the bushfires here a year or 2 ago. I had been replacing all the rubber insulated single strand wiring in it with aircraft teflon/fibreglass tinned wire. The rubber insulation had turned into clay, & my girlfriend's dad complained that he had to smack it round the ear sometimes to stop the crackling noise, so I grabbed it away from him quick smart in the interests of safety. It's like you just look at the wiring & a bit of insulation would fall off somewhere! I had not long previously acquired some of this super dooper wire from a friend, so I thought - "what better use for it than to really fix up that radio!" Yeah it was real good wire but the worst, most difficult I'd ever had to work with! Trying to get that insulation off? I could strip 5 wires per stanley blade or something stupid like that. Aircraft grade, more like spacecraft grade!
So I'd been replacing electros, valves & resistors bit by bit & I was gonna polish up the nice 2 tone bakelite cabinet, but not any more.
Being a technician before a musician, my brand new faulty valve guitar amp was soon in pieces. Apparently a Chinese made copy of a 15 watt Epiphone amp. I also got a copy of a Gibson Les Paul guitar, both for $1k, so hopefully they're pretty good. My oldest son was the drummer in a metal band at the time & I spose I got the bug during my 'midlife crisis'. I chose the guitar cos it looked the best! I had no idea how to play but just fell in love with the look of this guitar! All the pearl & different-coloured inlays, gold plated string adjusters! A thing of beauty just to look at! So yeah I'm fixing & modding my amp, which will be fun!
Didn't surprise me that just about all resistors & caps needed replacing. Never seen a leaking cap like that. Yikes! Love that trim trick. Remember dad doing that. Love your channel. Ready for part 3 of this beautiful receiver.
Your videos are awesome and the in-depth explanations are the best. Your channel by far is the best around for learning electronics and restoration. Seeing these great classics brought back to life is truly amazing! Keep up the awesome work and look forward to more great videos from the lab!
Thanks for your kind feedback!
Hey Paul like you desoldering tip regarding your “Favorite Pilers”. That is a GREAT idea !! We were all thought to make that mechanical connection before soldering. Here’s one for you that I like, I use various size forceps, they too have ridges for gripping but they lock and can work as a 3rd hand because of their weight(if you use large enough one) and you can let them go the weight will with the soldering iron will do the work if you need a 3rd hand. Even if you do not need a 3rd hand I find because forceps lock and come in various sizes and shapes(some come with a curved radius) for me they work better. They are also much finer for chassis that are very busy with components you can get in there much easier. I am frequently using forceps. Though you’d enjoy another perspective.
Ricky from IBM, Ret Englewood Florida
Congratulations on posting your 200th video to this channel!
Excellent explanation of the schematics and the design intent of all the components . I took some electronics courses over 30 years ago. Also took industrial electronics, PLC, and Robotics courses back then. I was also an industiral repariman BEFORE I started designing semi-automatic machines and product test equipment . I left that behind back in 2000. I moved into product design in various industries. Now I design plastic injection related products. Did delve into some data destruction machines in 2014. Later Aircraft Evacuation Slides. Also did some work on Blood Counting Machines in 2015. I like the variety in my design career. But I always have loved the "magic" of discrete electronics.
I admire you for doing this! I'm an old tech and am humbled by your knowledge.
Thanks Paul for the focus on the technical know-how, as well as the testing. push pull and phasing used to be a bit of a mystery to me but I am getting the hang of it thanks to specialists like yourself. Can't wait for the next video.
Hi Paul Thanks for an excellent series, really informative from someone who knows their craft. In case anyone thinks you're OTT with you oil warnings... A number of years ago in Ireland dioxins that had been banned for decades started to turn up during random sampling of bacon products. It turned out that old transformer oil had been recycled and mixed in with modern o il which was used to dry grain. This grain was then fed to pigs and the dioxins in the transformer oil having contaminated the grain then contaminated the meat.
Wow, interesting story, thanks for sharing that!
Dioxins? Omg they're one of the most toxic chemicals around! I think some components may have used polychlorinated biphenyls (pcb's!), which are also dreadfully bad for us.
Unprecedented way of unsoldering the components out of these leads.. thank you for enlightenment..👈😎📻👍🇨🇦
No problem 👍
Thanks, Mr. Carlson!
You're very welcome!
Gee, thanks, I was just going to go to sleep. I guess not for the next hour. 😂
😆
You are a top notch teacher, I especially love how you guide us through the schematics. I'm learning a lot and hooked on these excellent presentations.
👍. N5KY
I'm getting ready to restore a 1937 Philco 38-116. Looking forward to learning all i can from you in this series.
Paul you're still the best on You tube. Glad you explain in detail some of the reasons why things were designed as they were back then..... Learn the most from you and most professional on You tube. Can't thank you enough made my day. 73s Mike wb7qxu
Thanks for your feedback, and kind comment too Mike!
Nice! A resistor network, carefully tweaked, to match the two half waves driving the push-pull power amplifier output stage.
Tried this on a Transistor version applying a similar principle in a 1 room single-bed workshop during the late 70s,
the only cellar room in the house the parents had deemed safe when set on fire at the time.
Unfortunately, the project was abandoned because this one was soon running out of BD 138 paired transistors while tweaking the pots that had made up the above network.😮💨
Very informative and well done!👍😀 Looking forward to the next video. Thanks again for the time you dedicate to produce these videos. Very much appreciated!!👌🙂👏
Excellent video and crystal clear explanations as always. Thanks!
Keep em coming Paul, this series is going to be just great! Can't wait for the next instalment. TFS, GB :)
Thanx Paul for starting the first. Enjoy watching.thanx Ken from gpt ms
I ment the ge radio. Thanx Ken from got ms
My pleasure!
Good to follow the progress and learn from seeing it done. Thanks.
Hi, great channel. Your pronunciation of chassis makes me smile. I'm from the UK. It's shassey, not chassey lol. Love your attention to detail with describing things, other presenters assume you already know. Thanks.
Yeah that's right Andy! Us aussies & pommies need to learn the mericans how to talk propper! Lol! Nah it's all good. Like solder not soder! Huh?
Thanks for all the explainations and your process.
My pleasure!
Wow, this is a description beyond descriptions. Great job. I actually took pictures with one phone and made notes for my reference manual. The use of snubber capacitors in the output circuit as well as the addition of 1K stopper resistors in the grid path of the 6v6s. One thing I have always wondered about is why a capacitor is placed across the output transformer of a single tube amplifier? You're point by point description of the entire circuit makes the video! Thanks
Glad it was helpful!
Mr Carlsan your GE Cx 371 shortwave radio Receiver is so awesome
Sir, you are the 'Bob Ross' of Electronics.
I love that HP meter! The Nixie display looks fabulous on-camera. Picked up a 3440A (wtih the +- tube!) and with just a good cleaning, it works great. The design was pretty innovative for the time, and is still plenty accurate for general use today. I had hoped to make a video about it, but maybe I'll just wait and learn something from yours instead...
Thanks for sharing such a wealth of knowledge, superb
My pleasure!
Cracking good teaching experience - so very much appreciated
Glad you enjoyed it!
Thank you for your excellent video. It is amazing the quality of the equipment and your skills are mesmerizing to watch.
Very detailed, high quality video that you have uploaded. Nice.👌
Thanks Paul, enjoyed watching. Seen on 22-5-22 at 11:12 in the NL. pe1krx
I have a AR88 inside the bfo can which looks like one of the IF transformers is stuffed the caps and resistors it is working but then took it apart and found the resistors had gone out of spec due to the heat I recon.
Replaced all the parts and the output improved.
Quite a job to get to the parts.
I thought I would mention this in case you start looking for the res and caps on the restoration.
Hi Paul, the Benton Harbor boys taught me how to solder via their really well done instruction manuals. And, they always said to make sure you had a strong physical connection before you soldered. I always thought it was overkill, but hey, what did I know back then. Not much.
Heath had by far the best assembly manuals for their kits. Wish I had been around when they were still in business.
Has anyone ever said you sound like Jim carey ? Love your videos.
Perfect sunday morgning view. Thx for the interessting vid. :D
That was great Paul...Thank You!
Glad you enjoyed it Rich!
Been looking forward to watching this one.
It was a really cool video Paul, thanks a lot!
My pleasure!
these kinds of learning videos are soo relaxing... i wonder how they get the color rings on resistors and caps are so perfect? lots of factory machines to make a kool tube radio. 😍 thanks
Love your vids. Very knowledgeable and informative.
Nice old receiver.
Sprague apparently still uses Clorinol in their motor run capacitors; I wouldn't be surprised if that's what they used to put in their PIO Bumble Bees. Nasty stuff, known to the State of Cancer to cause California.
The bean counters were at work in the phase inverter section. Plenty of room in the chassis for an additional 12AX7 or small signal pentode, which would let you use that existing dual triode as a LTP and give more gain than you'd ever need.
Awesome. Thank you for posting
My pleasure!
In my 40 years plus of electronics repair I never knew those caps were oil filled. Well I’ll be dang. Enjoyed this episode. I’m with you on component lead placement and soldering.
Thank God-someone who does not preach that wires must be wrapped around terminals. I live in a 60 year old house with copper plumbing that is just held together solely by solder. It has been under 80 psi for over half a century. Also, let's remember that every circuit board in the world has its components held in just by solder.
Ian I generally agree with you, although very often I 'clinch' over component leads through pcbs down to about 15 degrees to the board, for added strength & reliability, particularly with the larger & heavier components. It definitely makes it more difficult to remove them should that be required, but I've hardly ever been required to repair anything I've ever built.
OMG, those Bumble Bee caps. LOL.
I would just swap out every resistor and capacitor in it. :)
I looked at many of your TH-cam videos and you are doing a very good job.
Can you making a video on how to locate a noisy transistor in an audio circuit. Most audio transistor testers will indicate that a noisy none transistor will test good on many transistor tester but they are noisy.
Your video’s are highly instructive even for myself an armchair spectator. I am curious about the costs for these materials ie: capacitors, tubes etc.
It would add another dimension to this video. Say you mention this part is a $2.00 resistor but this tube or capacitor is $30.00 in its day but its replacement is $199.00 As you can see I have no idea what these things cost anyway excellent show wouldn’t miss it for the world😊👍🇨🇦
Resistor, anything from 2 cents to 20 cents, depending where you buy, and what Wattage.
Tube: anything from $4.00 to $40.00, depending on the type.
Capacitor: anything from 5 cents to 2 dollar, depending on all the above, type, vendor, etc.
Prices may vary more for where you live.
@@erikdenhouter thank you 😊 👍🇨🇦 that helps
Nice project I have restored a lot of older radios always remember to slowly introduce the voltage to the old tubes with a variable voltage supply to keep them from popping. The sound quality is awesome and some tubes are so hard to get but I have a room full of tubes if you need any tubes let me know the number of the tube. Take care
Oil caps could have PCPs in them--toxic. Very common in old transformers.
I notice that you tested resistors in place but isolated (cut one lead. . .) on the caps. Depending on circuitry the resistors could have a (parallel) sneak circuit that would have altered test readings, though you seem to rely on the schematics to avoid this.
If you go behind the metal spring clip on the knob with a pick the knobs will come off easy
Great instructional!
I am astounded that you’re able to acquire the wiring diagrams on these older systems. May I ask where you find them? Is there an aftermarket database that repair individuals like yourself use? I’m involved in automotive repair and I typically use the OEM service data but I was curious how you find these diagrams where the manufacturer hasn’t been in business for decades. I find every one of your videos extraordinary!
This was pretty obviously the high-end of GE's receiver line, so not too surprising that the schematics are still available. I also wonder where he gets such clean schematics - a lot of the ones I run across are barely-legible scans.
@@drtidrow Hi Ray there are are groups & clubs (& I think a business or 2) that specifically exist to collect, collate & save old manuals & circuits. Some old units even had the circuit diagram stuck to the inside of their cabinets.
The Global feedback would help compensate for the high frequency loss caused by the 6V6 plate caps. Thank you for explaining the whole circuit in detail. Learned something the grid stopper resistor are not really need for 6V6 tubes. From a RF stand point, if they seen the need for the resistors in the power tube grids why did the engineers not put grid stopper resistors in series with the 12AX7 grids too?
Hi J.C. The 12AX7's are not power tubes attached to a transformer, so they have less tendency to parasitic oscillate.
I am quite interested to see how this amp performs when done, I suspect it won't be much better than the one I have myself.
The limiting factor being the audio output transformer, which looked to be identical to the one in mine, 9-10k primary 10w RMS, (stancor a-3831 equivalent) easy to push this amp into oversaturation, especially with the lower frequencies.
I was rather surprised myself that the output did not burn up along with the power transformer, just got lucky.
An exact PT was unattainable, so the one I used (Sansui) had 2 options vs the original's secondary 340-0-340 @ .130a , and that was 390-0-390 & 300-0-300 @ .195a, I chose 300, and NOT to use the 5u4gb but rather a pair of silicon diodes, (1A 1kv), the socket for the 5u4 is badly damaged anyway, however I did hook up the heaters so they would light up.
This configuration is working rather well, and the bias is pretty much were it should be.
It's not the best sounding amp by far, and I can easily push the poor old 12 inch in it too far, and I suspect that the old outputs I had laying around may be a bit tired, and a matched set of JJ 6V6GTs may help to some degree, but I'm kind of on the fence to spend that much on something that will be used mostly for TV audio. :O
Love the old Hp nixie voltmeter!
Thanks Steve!
Would like to know Mr.C, who in your opinion built the most robust, toughest test equipment in the 20th century? I'm in my 26th year in Electronic calibration/repair at a NASA Center and I think General Radio ranked way up there, maybe a tad better than Tek and HP. Their layouts and wire dressing were works of art, not to mention dang near explosion proof. Definitely drop proof! There were others as well I can't think of right off. Btw we still service/repair on a component level, though that service will be gone very soon. Love your work!
I would agree Steve, GenRad made great equipment. TEK was very reliable, and up there too. HP was good for the most part, but I didn't agree with some of their designs for various reasons. Going way back, Boonton was fantastic, and still is. Really, they are all great, but some stronger in areas others are not. Thanks for your kind comment, and taking the time to write.
you should try to fix some apollo stuf from CouriousmMrc... that would be really fun to see on your bench
Another great vid! Thank you!
32:35 - regarding heating the filament of the 5Y3 with AC - probably worth saying the words for that - it works because the "thermal inertia" of the filament is enough to keep that AC heating current variation from varying the temperature. If it were a lower frequency AC in theory the filament temp could vary over the cycle enough to matter. But, at normal line frequency it doesn't; it keeps a relatively constant temperature in spite of the actual *heating* varying as the AC current varies. So... no hum.
Good to remember a bit of physics sometimes. 🙂
Awesome video!
Thanks!
Great video Paul, I'm always learning something new. That Tek scope on the bench is huge, is that one of those Windows based scopes? Oh man those things gave me nothing but headaches. I hope you have better luck with them than I did
LOL, you know the scopes well! That scope (when it's working) is fantastic, but a handful to keep it that way. I think I finally have a stable device. The covers, and the million screws that hold it together have been removed, let's just say, "a fair amount of times." Thanks for your kind comment!
I’m betting that the resistor leads are bent around the solder tabs was necessary in a factory setting to hold the parts in place and then most or all the joints soldered at once
Like 863 from Murten - Switzerland!
It takes about 5 minutes to change one resistor by that method but it is the better method if you want to properly restore a radio and keep it as close to 3 as possible.
Very nice explanations, but I still don't understand that explanation on the AC on the filaments line being isolated. Maybe in a future video you could explain it a little bit more. Thanks.
Will do. Thanks for your comment!
Why would they parallel a 15 and 30 Uf cap instead of just putting one 47 Uf like you said could be done? Was there a reason or was it just because they had those on hand and were cheep?
You are probably correct. Many times, it's about using the parts on hand. They probably had 100000 + of these caps, so they just use them up.
Excellent video Paul, very enjoyable and educational to watch you walk through the schematic. Question though: will you be using NOS dust when you refresh the cabinet, or do you stock modern dust with the age appropriate characteristics?
lol!
My god!
You mean to tell me that he hasn’t invented a knob pull / removal tool yet! We must help him! 😂
I question the statement of not hooking a component when tying it to a tube socket or terminal strip. This may be OK when replacing a component, but what if it is a new build (as in a kit) where you have 3 or 4 components to a tie point, you then have to worry about a component or wire lead falling out of the connection so that when you come back to solder, you might not see it.
Where did the missing pin go? Is it in the plug?
A couple of leads on resistors and caps on the upper right side of the amp seem to be a bit hairy with short fiber-looking structures. Is that dust or "tin pest" on the tinned leads?
I'm sure it's a combination of both. Cadmium plating oxidization too.
Hi Paul . Great video as always, can’t wait for ther rest 😊 . Minute 29. Is it not better to use a CT coil to invert the signal ? Would probably be more expensive but if we don’t think money which is the best way to invert the signal in a PP amp?
That works, Stromberg Carlson did this in their early radios. Interstage transformers are also common, but using a good old tube to do the job is just as good. Thanks for your kind comment!
I've been waiting!
Thanks for doing this receiver first, Paul. I love the look of it, and would love to see it taking pride of place in my living room.
My pleasure!
How do you know when you can measure resistor values in-circuit?
I didn't see any information of the power supply voltage in the schematic. I would have expected to see a value so that it can be easily measured and checked. Did I miss it or why is there no information about the voltage?
Can you rebuild the Black Beauty capacitors?
Explanation at 18:20 sounds little bit confusing to me. As I understand 4 and 8 Ohm are just pole marking to properly connect 4 or 8 Ohm speakers.
Is the cap on the Tone control lead just smashed to the chassis?
Spot welded on the assembly line to the chassis, this is how I know the bumble bee caps are original (for sure.) Good eye!
@@MrCarlsonsLab the 4K video really helps see things like that! Thanks for all the extra time, effort and pain your going through for that. :)
PCBs in the capacitor oil?