EEVblog 1450- $99 Fluke Combiscope Ebay SCORE!
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- Опубліковано 7 лип 2024
- A $99 Fluke PM3370B Combiscope score from Ebay!
Will it work?
Unboxing video: odysee.com/@eevblog:7/2022-01...
00:00 - Fluke Combiscope Ebay Score
03:26 - Will it work?
05:32 - WTF was THAT?!
10:25 - Teardown
15:48 - Unusual ASIC Bypassing!
17:11 - Dodge of the day AWARD WINNER!
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Unboxing video is here: odysee.com/@eevblog:7/2022-01-18-FlukeScopeUnboxing:f
How do you even manage that? Id give up a kidney to find something like that for such a low amount of money
Do you have a repair shop? If yes, where?
I wonder how much you paid for shipping to Australia.
Those pale blue electrolytic caps are absolute garbage. German equipment I work on has those same caps and they are a VERY high failure rate.
You heard a high pitched squeal when it fails? I vote for the high voltage multiplier failing.
Ah, old times...
Developed and produced here in Almelo, the Netherlands. At the time the CombiScope series was developed we were Philips; later our plant was sold to Fluke.
The main processor was a Intel 80c196kb microcontroller that contained bootcode written by me ;-)
Yes, these Philips OQ chips were developed here.
Makes me sad as a Motorola fanboy. I had (still have) the PM3365 which seems like a predecessor to this device, and it's using a Motorola 68008 if I remember correctly.
Do we see the 80C196KB in the video?
@@mojoblues66
Yes, D100 on the board with the serial port and IEEE bus at 17:55
@@robvandeschepop8595 Ah right I see it. But doesn't it say 83C196KB?
Nice to hear from an engineer who contributed to the design :)
The Philips tubes were just stunning. I like the way they bonded an actual, perfectly flat glass plate with the graticule to the front of the cone and inserted the gun deflection assembly built in regular glass tube in to it. The only part that was moulded was the cone, and they used frit glass to solder the 3 parts together. And no, I never saw one go to air. Exceptional tubes, the spinout from Philips continued to make them for quite a long time, AFAIK, the last CRT manufacturer to close in Europe.
They were copying Tektronix and the way they made their tubes, but Tektronix took CRT construction to the extreme, using even ceramic envelopes for phenomenal thermal stability. And nobody ever made a finer tube than a Microchannel Plate Tektronix tube.
2:00 in case you're wondering what the "flying saucer" on the front page of that manual is: it's the "Evoluon" in Eindhoven, the Netherlands, the home town of Philips (and me). Built in 1966 for Philips and was used as science museum until 1984. It still exists but is in use for other purposes now.
Remember visiting the museum as a kit - impressive building!
That scope was super clean inside - and so many things done top-notch, that it's surprising there were some oversights like the poor mounting clip design and lack of test points. But still - what a steal!
I was amazed, not a spec of dust. Probably only had a few 10's of hour of use or something.
What do you bet that it wasn't used due to this power problem and no one bothered to send it back or get it fixed?
@@russellhltn1396 ..... Good detective work Mycroft, (Sherlock's smarter brother).
I was thinking the same.
@@russellhltn1396 I have the same theory on retro computers, you get one mint in the box, beautiful - you just know its not going to work because it never worked! Hence mint in box.
Being from The Netherlands, this brings back so many memories! Those 1990s Philips batteries powered my toys. Later when I went to my first summer job, I used these Combiscopes a lot. Later still and I met some people from Almelo where these were built. Cool to see this stuff back!
Same. Got a huge nostalgia hit looking at those Philips batteries.
I have one too, and I think I bought it for around 75 USD. Same condition but working. Use it regularly and have been for three or four years now. I have several other scopes, both modern and much faster analog and digital, but still use this one as I like it a lot.
Nice score and look forward to the repair video.
Wow, what a score! I'd love to see a testing and repair video on this piece of kit. My first suspicion is a failed cap or solder joint in the power supply. The caps look good, but that doesn't really mean a whole lot.
I bought one of these combiscopes in 4 channel. It shut off after a while as well. Turns out the fan was going out and it would overheat. One replacement fan later, and no more issues.
I thought mine had more knobs than relying on buttons, but it was several years ago, and I don’t have that scope any longer.
This needs to be higher.
Got the exact same model since the beginning of the year. My first oscilloscope, and even though I kind of wish it had knobs and Vernier, it's still pretty freaking cool!
I love that I can just switch between digital and analog mode.
Last year I picked up one of those for 70 euro including a function generator, a set of probes/cables and even a cool fluke carrying bag for the scope. It works perfectly and I use it a lot for uni and projects, best deal of my life.
Those 32k 2k/8k option resistors at 15:50 look quite interesting :) I wonder if this puppy can be upgraded with bigger memory chips (as it would seem that there are pins on the memory IC footprints for larger packages)
That would be interesting, you think it's feasible that the firmware would be able to recognize and utilize more memory without the need to modify it?
Edit: 7:21 kind of suggests so. I'm going to have to rtfm on that.
My guess is the firmware will do it if they went to the effort to put in and label the jumpers. Will need to check the manual for the part number of the bigger chip required. The ones fitted are definitely 2K each.
@@EEVblog that would be an idea for a video. If you could manage it, I'd try it too.
Above the upper right edge of the ceramic IC of someone wants to have a look
The PS could be going into protection mode due to some other cause. I remember when Phillips announced their 7 ICs to make a TV it was a milestone. Their Compact Cassette wasn't bad either.
Not forgetting the CD are we? Lots of people think that was a Sony invention.
@@ernstoud They did invent the Paancake Motor that was first used in the second gen Walkman which extended battery life and slim case. James Russell 1965 is credited for the CD concept 1980 when Sony and Philips created the famed “Red Book” standard, which was a series of documents that outlined a 120mm diameter disc bearing music at a resolution of 16 bit/44.1kHz.
@Viewer19 A bit of a weird question maybe, but I noticed you wrote Phillips with double L, the same as I remember the name was written, so do you remember Phillips having a double L instead of the one there is now in the name? In case you're not familiar with the so-called Mandela effect, this one is a nice example for me personally as I clearly remember it being written with double L. And I'm not the only one remembering it like that, hence my question what your memories are.
Thanks for even looking into this! It really means a lot for me and the research I'm doing around the "effect".
@@maesterwillyofthehouseofboink I realized my error right after posting dyslexia in my case afects names mostly ei orie endings more so when I am tired.
I scored two scopes at a surplus place. One was a Tektronics 2445A for $50 and the other is a Tektronics 2465B for $60. Both would not turn on which suggests power supply problem. I was able to locate a refurb power supply for the 2465B from Greece for $265 and it has been a great scope since. I was not able to locate a power supply or service manual for the 2445A, so I never bothered to do anything with it since the 2465B is the better model. Great score!
I look forward to the repair video. That scope looks great.
I just love the right angle traces, SOOO Vintage, almost animative.
Used to have a 3082 if memory serves - very similar but 100Mhz and no memory. It was amazing. Bought it from UK Army auction for €150, sold it 15 years later for £150 😂
Absolutely amazing. Open it up and admire the absolute absence of trimmers. All is done via service menu.
The PM3380B is the first scope I bought off ebay back in high school. Served me well, such an awesome piece of tech. I still use it every now and then.
My friend had an LG TV that would power cycle every minute. I took out the power supply board, nothing obviously wrong so I heated every solder joint on the primary side and now it works perfectly, a rare triumph! This strategy might work with your power board too.
Good idea, it's probably a dry solder joint on those heavy power supply components.
@@Tech2C Yes, it occurred to me that it was a temperature/movement related issue possibly. Be interesting to see what he finds.
Don't worry Dave, confusing Holland with Poland is really common for Austrians 🤪
Those Philips batteries sure look like late 90's design 😁
I was scoring a couple of Philips testgear in the last years - but unfortunately it seems like in recent times it got around, that this is some decent test gear. I bought TWO recently calibrated PM 2534 for 180€ ($230AUD) as bulk. I use those in my daily work. I have a set of PM2521 and a set of PM2525 - and now a set of PM2534. All together for under $350US. I absolutely love those.
Worked with the 4 channel 3394B 200MHz for years @ Philips. Eating their own dog food. Once they really became obsolete was able to buy one for 40 euro’s. Still work fine altough the tube is burned in and fading.
All those buttons were great to work with. Better than moving though the menu’s of modern scope. That being said.. a modern scope has more functionality. But never had a scope with faster GUI response.
Also great to have analog mode when adc’s lacked speed back in the days. Always a quick way to check what was really going on… (aliasing articfacts….)
I’ve had the 4 channel Philips branded 200 MHz version for years now. A bit yellower but the original (Belgian made) Phillips AAs are still going and clean. Glad to see it’s Dave approved.
I thought it was cool the I’ve had the 4 channel Philips branded 200 MHz version for years now. A bit yellower but not bad. Glad to see it’s Dave approved.
I thought it was cool the TV trigger mode has settings for analog HD systems at 1050, 1125 and 1250 lines.
im amazed how clean it is inside... just like the day it was brought!..
We have 2 digital/analog, 2 analog only of these with 4 channels and 200MHz bandwidth.
The are pretty good for their age and easy to operate compared to older Philips digital scopes. The digital/analog switch is great to have.
These ones have had a hard life, they have been dropped many times, the front bezels and knobs are broken. Three were were bought around 1998 but they all still work perfectly.
I bought one of the digital/analog ones about 10 years ago for $300 on Ebay.
Saturday morning live streams are always good to join in on! 👍
My bet is the voltage tripler is likely breaking down, because it used RIFA capacitors inside. Also note all the blue SMD resistors are also Phillips manufacture.
I think the small blue electrolytic capacitors are Phillips too, today being manufactured by Vishay.
I hope it's not the tripler and it's just a part I can easily replace.
RIFA madness !
@UC-Oqbitl8rdcBnWttTLgErw The bots are on almost every one of my videos.
@@EEVblog Here's how to deal with spambots: ua-cam.com/video/2tRppXW_aKo/v-deo.html
One of the Philips promotions made note of them having screwless assembly, in reality they all had three screws, top case, bottom case, and IEC cable retention.
The autoset button from these original mid 80’s era scopes is always useful. I still have a PM3055 with a semi destroyed front panel 😃
I was using a 4 channel 100Mhz Fluke scope that looked a lot like this - same deal. The tilting bail had gone and it had seen better days. I had to let it go as I was in desperate need of space, but the new owner was thrilled. I am instead using a Rigol DS1052E - which is fine for my needs, as I'm mostly looking at low-frequency PWM signals with it - practically DC.
Woah it looks brand new inside! That is unbelievable...
The scope looks very nice - Thanks for Video - Greetings from Poland
used the original Philips version - was the most used scope in the apprenticeship workshop because of it's auto function :) Thanks for showing.
Looks nice. Those batteries bring back memories
Awesome score Dave, looking forward to the repair!
I scored a Tektronix 465 (not the b model) 100Mhz analog delay scope för about 40 EUR a couple years ago, complete with probes, original manuals and documentation etc. The pots are a bit scratchy and I plan on refurbishing it one day.
Been using that scope since about 1980. Still works fine and is the "quick and dirty" choice when I want to look at something. Oddly, being on a scope cart makes it more convenient to use than my benchtop stuff...
I managed to pick up a 4 channel 200mhz/200ms/s pm3394 for around 140 USD a few years back. Fantastic scope, and it's even got FFT!
I actually bought a Tektronix 2430A DSO at Tek's surplus sale (their home office is just down the street from me) for $65 - and it still works ;). It even has a strange serial number "CARLB"
Philips batteries was made in POLAND. Best regards from POLAND ;)
I've noticed headers for missing rear panel outputs on the mainboard, as well as RF connectors for 4 channels on the acquisition board. 1st DAC had CH1 and CH3, and 2nd DAC had CH2 and CH4 labeled connectors.
Can't wait for the repair video ! :-)
I got the 200mhz version on ebay PM 3390b for just under $100 aud A few years back . The Triger level rotary encoder is a little bit fiddley and needs replacement but otherwise its mint. Great scope!
I'd KILL for a scope like this. Such a good scope for the day I'm amazed. Due to COVID my budget is $0 and I've been reduced to designing a "dodgyscope" using a couple of microcontrollers. Which in itself has turned into an interesting project... I'm going to add a digital logic analyzer to it using some SRAM and counters to clock them. Thankfully I have the parts in my parts drawer so BOM is $0 for now :)
@@Okurka. nope but I bought them back when I had money, pre covid. Of course it will cost something for someone else to replicate the design once I publish it.
..... Circumstance steering you down a brain improving path you may not have taken.
The earlier Philips scopes were rubbish, it was said that if they couldn't calculate a circuit resistor value, they would add a Pot to the front panel. The scope in the video was the first of a new generation of design that was really good. At the time it came out, I was working for a Philips company, and purchased one through a staff discount scheme, unfortunately I paid a lot more for mine, even with the discount, then you did.
I still have it, and it still works.
There were software upgrades on offer, including additional mathematic processing functions, such as the FFT.
The scopes also came with remote control software, with a screen capture and a print screen option.
Geez Dave, you find all the good stuff ;)
Took me almost two years, but I eventually found a PM3323. Needed a bit of fixing, but now works like a charm. Total cost (incl. replacement-parts): about 120€
Gotta love the videos of this Austrian guy. 👍
I still use another combiscope Hameg HM-1508 . About 17 years ago I bought it new from local dealer. Analog part is excellent.
I have had a internship at benchmark electronics in Almelo the Netherlands as part of my electronic engineering study. Benchmark electronics Almelo used to be the Philips measurement equipment division. in the 90's fluke and Philips had a alliance to make and market equipment to each others markets under there own name (so fluke equipment named Philips in Europe and Fluke branded Philips equipment in the usa). They still used the 4 channel 200MHz combiscopes on the production and test floor when i was there. I ended up with a Fluke branded PM3094 scope (4 channel 200MHz) in a employee equipment market for about 50 euro's while I was there that I still use.
Very cool! I have a Philips PM 3200 X scope. It was targeted for TV repairs and has several provisions for that. Very cool device.
Oh, nice. Can you shortly mention those provisions? I'd guess a trigger mode, but what else?
At public auction I scored TWO Fluke PM3384A Combiscopes (the 100 MHz big brother to this scope), one fully optioned, and an HP 54501A, all for FIVE BUCKS (plus some other assorted gear), and they all worked perfectly. The HP already went out the door with a replaced NVRAM (socketed of course, I ain't no scrub), while the fully optioned Fluke is my daily driver. I still have the other PM3384A, maybe I'll drop it in the FS section on the EEVblog forum and see if people are interested.
These scopes are real gems; I love that you can get to most functions directly with buttons, and most menus don't have tons of levels and scrolling. Despite being quite capable and super easy to use, they seem to be somewhat unknown in the oscilloscope world, at least compared with the big names. You can also get a fancypants Fluke 1X/10X probe with a function button that can be programmed to do things like one-shot or switch between analog and digital mode.
Mine was cheaper, but yours is better. Scored a Tektronix 2213 'scope for US$75 shipped. Two channel, 60 MHz, all analog, no OSD and certainly no memory. It too required some simple repair (yay service manual!), but it works well for me, and simplicity is great for its repair-ability. One of your videos actually helped me figure out the calibration process in the service manual; thanks! Love the idea of a repair video on this Philips/Fluke -- an intermittent bug might actually present a challenge for you. 😁👍️
I'll be waiting for the repair on this one.
I have had a PM3394 for 26 years now and use it as my daily scope because of its great flexibility and better user interface compared to many more modern scopes. I mostly use it in analog and only occasionally switch to digital mode for those more difficult measurements.
Still works great after all this time and it still has the original Philips (made in Belgium not Poland) batteries which still read more than 1.5V.
It wasn't being made in Poland anyway, but rather Holland (Netherlands).
@@justotalkalottashit8392 ah, sorry, my bad! I listened to the video (mostly) and shouldn't comment so late at night.
I thought you referred to the scope itself, not the batteries, gah!
I can still be wrong about the scope, correct me if I'm wrong, but I don't think Fluke rebranded Philips scopes were produced in Poland. I'll check the "made in..." label on mine when I'm back from work. I suspect Netherlands though, Philips being a company from there, but I'm not sure where they were actually put together in.
@@tomaszwota1465 -- Didn't you know "P" sounds like 'Hohh" in Australia?
@@poopytowncat Well, I had to watch Dave for years before I could even understand the Australian accent, but I'm still behind the curve it seems!
@@tomaszwota1465 -- If you believe my comment you'll be totally lost!
I *wish* modern MCUs/FPGAs came with the requisite MLCCs plonked on top of the package like that... the chip designers could just guarantee the required decoupling rather than painstakingly outlining it in the docs, and that'd be less components for me to route around/make space for on my boards. I realise the economics don't make sense or something, but still, I would be so happy.
Completely coincidentally, a PM3394B from eBay arrived here yesterday: I've always been intrigued about combiscopes, and I won't deny they still look sexy with all those buttons! Mine works except two channels 2 & 4 have large negative offsets in digital mode, I think this might be one of the hybrids :-(
I had exactly the same batteries in mine too! One was dead, the other still measured 1.4V.
I've changed the default trace intensity in analogue mode, as it went invisible after an autoset. More work to be done!
I've bought one as well (Fluke branded PM 3370B like in the video) a few weeks ago, seems to work great. I'd ask "what are the chances" but I can see the seller had a few of them, so likely they all came from some bigger organisation after being retired.
Channels 2 & 4? That's weird, as they'd be on seperate cards.
I bought a pristine Heathkit OS-1 once for £1 I think it was - 3db down at 2.5Mhz and full of tubular glass things ! Parked in my garage about 20 years ago, where it remains...
I one got an non working gould DRO 1624 (digital recording oscilloscope) for ~40 euro.
20MHz 20MS/s, but 4ch and with build in 4 differential channels.
Owner claimed the CRT was dead.
Switched on, tuned the intensity up, perfectly working.
Only the old thermal printer burned up while testing. Otherwise still fine.
I LOVE the Pin Grid Array!!! None of this BGA or FN or LGA bullcrap these days...
Wow I would love to add that to my repair bench that is a nice unit !!
Nice catch Mr. EE. Time for a repair vid.
Amazing pickup! Some people have all the fluke!
Excellent haul, I’m jealous.
Technical term...."Fuhbarred!" lol
1999...What a GREAT VINTAGE!
Noticed a bulging electrolytic at roughly the 3 o'clock position at 12:39. Might want to check that out.
The blip at 14:37 had more concered for a moment, I thought something in my PC just popped.
Nice Find
NICE SCORE DAVE WINNER WINNER CHICKEN DINNER
Fantastic engineering job. I've had a Philips/Fluke scope in for a PSU repair and it was a pain in the ass to disassemble, with multiple PCBs stacked on top of each other, meh. It had a stinky dead Rifa cap too! And this one is a complete opposite, just a few elegantly designed boards on a backplane, that's all. I wonder if you're gonna try your hand at fixing the dying-all-of-a-sudden issue.
I really loved this!
Mine has been in storage since 2015. Drug it out now and same thing. On a while and off. I've ordered a mass recap from Mouser. Gotta watch 1452 to see what you find!
Try to power up the board and look at it through IR scope. I have a feeling some temperature controlled thyristor in power supply is failing, or some part driving it is overheating and turning off the unit. The orange flat "standing" envelopes could be quartz crystals for clocks. I've seen those before in a similar packaging and had to break some apart (when I was scavenger parts out of trash finds) to figure out what those were. Cheers.
A few months back I snaffled a Leader LS1020 (spares/not working) for £35 Sterling on ebay. I could see from the advert that it had a sweep but there was only 1 trace showing. When I got it I found that there was indeed only one visible trace and it was clipping badly at anything above about 5mV/Div also, the vertical position adjustment did absolutely nothing. Anyway after some cleaning/lubricating it became apparent that both channels had a trace - they were just superimposed. Whilst checking power rails I managed to short something which resulted in the +120V dropping to less than 100V, eventually tracked down to a C-B short on a regulator transistor, so easy to fix. I think I had managed to flex the extension rod for the power switch and bridge it across the +120V rail and ground.
Back to the display. I knew the issue had to be in an area that was common to both channels and so after checking the front end I started at the final vertical amplifier and worked backwards. All the electrolytics were in good physical shape so before lifting them all for checking, I checked all resistors in-situ on that board and found a common 33kOhm one completely open. I did not have a 1/2W one available so used a parallel pair of 1/4W, 64KOhm to check it.
Result - it suddenly provided a crisp, clean example of an analogue trace on both channels - 'thing of beauty', as Dave might say!
So, proper resistor installed and transistor (ebay again) replaced for about £8 Sterling, adjustments and partial calibration carried out and I have a lovely 20MHz 'scope for less than £50 + carriage. All pots and switches are a joy to use and it makes delightful Lissajous patterns. Winner, winner, chic ...................!!!
These remind me of the scopes we had at Uni.
It is super clean.
Hi Dave got of these scope and it’s brilliant
Coming, friend. Amazing. The best video, friend.. great.. greetings from your best friend, Indonesian Traditional Gold Seeker🇦🇺🇮🇩👍👍
those bus connectors for the cards look a lot like the NuBus connectors use in the 68K Mac's that had slots.
What a beut!
Gorgeous!
I picked up a TENMA 6810 for about £50, for parts, fully working.
Mate, so cheap, I had to pay $450 kangeroos for my Philips/Fluke PM3065 analog last year. Yours is such a great colour!
Its time to use the thermal camera. :D
I think that the problem is coming from the high voltage supply for the CRT.
Awesome!
Nice scopes, these Philips/Fluke combiscopes. We had a lot of PM3335s, 3350s and PM3394s where I worked some years ago. One problem occured when we tried to capture the pulses of high voltage breakdowns with several kilovolts (through a divider) with one of them. Had to set up the scope some 10 meters away with a terminated coax, the shielding of these are not great, as you saw with the all-plastic case. The old tube-based hp's did not care at all :) Seems yours has a PSU problem (overvoltage protect?) She'll be right :)
That scope is probably made in Almelo, The Netherlands. Very close by where I live. And the little transformers in the unit are from Tecnotion. I used to work there, they now make linear motors. These scopes where built by philips, for Fluke.
Not rubbish. I can appreciate the 10Gs/s repetitive because for a long time sampling scopes were the only way to view higher frequency repetitive waveforms. 1970 was nostalgized and was perhaps the heyday for sampling scopes.
Please Dave, make repair video. This is one beautiful scope 😊
The two SIP ICs you were asking about are for buffering according to their info. I'm not sure why they went with that particular package. They look like the PEC circuits, that were used in some of the old tube equipment.
Ebay has gone mad in prices these days so a score is a SCORE.
Good Man Dave.
Same as Phillips, I've got the 4 ch version!
Just art.
Nice score. I used to work for a company that had some Phillips made function generators. I recognized the part number as Phillips. That power supply issue shouldn't be too hard to track down. The board shown at 15:16 has labels for channels 1 through 4. Could it be a four channel board but the front panel doesn't have the extra BNCs for the third and fourth channels?
Watching this on a Philips monitor :) Beauty!
I've used this tool when I studied at VOCATIONAL SCHOOL, and I had to wait a long time to warm up, before I could use this tool
Yeah, it takes a while before it warms up.
Don’t be surprised if it turns out to be a bad power switch. I have an old HP signal generator that does the same thing. It’s better having cycled it a few times, but I need to clean it up. I know it’s the power button because it had a few times wiggling the button got the power to rapidly cycle off and on. Had the same delay to failure. Of course, problems in the HV power supply could be going on, but you know how often it’s just a switch or the power supply.
Nice! I've got the 4 channel version. But its in pieces on the healing bench, half way through re-caping it. Fingers crossed! :-)
Mine has similar problem, after about 10 minutes warm up, it starts to reset, and the resets get closer together as the scope heats up.
if theres a thermistor in box c13 (i think) on power supply module, may be worth a measurement
@@azza-in_this_day_and_age How would this cause resets?
I have 2 theories:
1) an electrolytic is leaking and as it heats it pull the processor rail down, until it resets.
2) the processor or ROM has had too many hours and as they heat, one or the other gets corrupted and then resets.
I hope its theory 1 and not theory 2. 1 is fixable, 2 might be fixable if its the processor, but if its the ROM, its likely not fixable, as there are no sources for the code in these ROMs. :-)
@@mcconkeyb the thermistor, as the name would imply, can overheat and cause the circuit to open, if broken in a certain way, it would allow for a reset upon cooling. i ran into it on an hvac blower motor. the intermittent faults are always a challenge, best of luck in your diagnosing
@@mcconkeyb if theory 2, you might try re flowing the board before re-balling that processor.
All the scopes I was looking at over the weekend are now sold 😤
Cheers Dave 🤔
my god, this thing is in amazing condition, good snap!
I picked up the 100 MHz ver for 100 at cashies Burwood nsw was a bit beaten up underneath about 15 year ago recently had to replace fan as it ran on 24v used 2 12v fans now twice as cool
On the side of the tube is a board, chips tend to overheat a bit.
I am super jealous right now!!!!
We got one of those in similar condition at work. Never turned it on, though.
Resistors ladder at the end.