Rebuilding The Old Tube Amplifier On This 1964 Rowe AMI Tropicana Jukebox - Will She Play Once More?

[@whiskyguzzler982]

“Other channels would have figured this out before they started filming it.” - That’s why we love THIS channel!

[@LyonsArcade]

I think most people are pretty lighthearted about it like we are but I really tiptoed into some weirdos in the tube amp world 😀

[@spshc]

When I was a kid we had, along with everyone else, a TV with tubes. When something happened and the TV wasn't working right, my dad would see if any of the tubes were not working or in question. (He learned about working on electronics in WW II while in the Navy working as a radio repair technician.) We then would go to the hardware store to test the tubes in question on the tube tester machine. As a kid I thought the tube tester machine was the greatest thing around. When we couldn't determine what was broken on the TV, we would call the "TV repair man" who would come to your house and hopefully fix what was going on.

[@theoldbigmoose]

Such fond memories you kindled spshc! My Pops did the same. Those were good times! I miss that world, and him deeply.

[@gregoryschmidt1233]

and hopefully not the dreaded, "It's going to have to go to the shop."

[@tonytavary3388]

I LOVE the sound put out by those old tube amps! Great job Ron!

[@Nunya_Bidnez]

Ron and Joe gonna get this baby up and running for sure. Lets do this

[@masterhand03]

Sounds old-timey as heck, I love it.

[@Even-Steven]

She's singing again! Nice job, Ronnie! Love that old timey sound coming out of vintage equipment.

[@LyonsArcade]

Yeah it really does sound warmer….

[@bjbarhorst]

Respect in getting this tube amplifier back up and running. It gives me the motivation to get my old tube radio playing music again.

[@SergZak2023]

Great job, Ron! Thanks!

[@LyonsArcade]

Thank you for watching Serg!

[@vincediesil]

I'm late to the party, but finally got to watch this. That thing sounds great. I think I'm almost as impressed the speakers are not completely trashed from age!

[@LyonsArcade]

I don’t have a ton of speaker problems usually…. But the rockola we just did had both woofers blown!

[@vincediesil]

@@LyonsArcade Those old speakers must be made a lot better than more modern stuff!

[@soverysleepy]

sounds sweet! and the music sounds like the '40's, like in the old movies i grew up watching

[@VoodooDewey69]

The neighbors are wondering if Lawrence Welk lives nextdoor.Sounds great like only tube amps can . Fantastic job .

[@antonnym214]

I like the way you think AND it was great the way you talked everyone into getting the tube tester. You always do a great job. All good wishes, good sir!

[@LyonsArcade]

Thank you again

[@tangothecat237]

Beautiful sound and yes wow. I don't know what it is but it sounds special.

[@LyonsArcade]

She's coming back!

[@jeffo881]

Ron is a "juke box hero, he got stars in his eye's"

[@mdouglaswray]

DAMN! Nice work on getting that amp working.

[@okiedean1112]

Hey Ron! I figured the old waxy caps where out of range, some resisters , I wanna se some tube checking, I remember next vid. You done a fine job, "🎶Put another dime in the jukebox baby!

[@LyonsArcade]

Let's see if I can scrounge up a tube tester heah

[@DeadKoby]

There's something about the sound of tube amps. I just build a tube amp a few days ago, and the sound is really something special.

[@PlumGurly]

Yeah, they tend to clip overdriving more gracefully than the modern stuff, and there is more bass emphasis.

[@jasonudall8614]

Esp at around 5:00

[@dvv45]

Great Job! Enjoy old jukeboxes!

[@antonnym214]

How utterly excellent Neil sent you the capacitor checker! I wish the button were a little different, (Just kidding!) but that was super thoughtful. Thank you for making such interesting videos! I like to take you into the kitchen when I'm cleaning up. Before you know it, some cool equipment is fixed AND my dishes are clean. It's a win-win! All good wishes.

[@LyonsArcade]

thank you Anton, boy those are some clean looking dishes!

[@NewTestamentDoc]

Thanks!

[@LyonsArcade]

Thank you D A we appreciate you watching!

[@SinisterSpatula]

Way cool. I'd love to see how that "light show" dancing lights in the top left actually works, how it creates that effect. I think my favorite jukebox effect has to be the moving bubbles.

[@stphinkle]

I suspect that it is a motor disk of some type but I could be wrong.

[@brad9529]

@@stphinkle yes I think you are correct.

[@jasonudall8614]

Moire effect. Two or more similar patterns made on transparent disc. One rotates relative to other...pattern comes from varing inter section

[@PlumGurly]

@@jasonudall8614 -- I didn't know. I thought maybe it could be a miniature, special-purpose CRT, but what you said makes more sense here. So a motorized kaleidoscope. The reason I thought it could be a type of tube is that there was an old indicator that was commonly called a "magic eye" which was used as an RF strength meter on old radios. That was a miniature CRT. It would form a green halo and the closer it was to a complete circle, the stronger the signal driving it was.

[@stphinkle]

@@PlumGurly I think with the short life of Magic Eye Tubes and the fact that jukeboxes are on for many hours a day, and the fact that magic eyes are usually one color (most use a green phosphor), I don't think a magic eye is suitable for jukebox use in this case. Magic Eyes are usually used as tuning indicators in some radios and were used in test equipment to indicate different things. The effect in the jukebox looks more mechanical than magic eye too.

[@jameswacker3827]

Awesome job as usual! Thanks for taking us along!

[@materialsguy2002]

Sounds great, nice work Ron.👍🏻

[@LyonsArcade]

Thank you Shaun!

[@victorsvarietychannel2459]

You really stepped out of your element on this one. Awesome video

[@tjsogmc]

Awesome! I've always wanted to work on a mechanical juke-box. Seems like a very challenging project. I've worked on a lot of old tube amplifiers and radios, and I'll tell you that tubes really don't go bad very often. I am running tubes in some of my AA5 radios that are 1950's vintage and they are still going strong. The capacitors are another matter- I change those right away because they just die over time and nothing will stop the decay process. It's easier just to junk the originals and put in new caps and not worry about static or fires. Good job, guys, keep the old tech alive!

[@AiMR]

Great job on the amps Ron! I remember that animation on there, it was mesmerizing as a kid looking at that and listening to the records

[@mycatsdead]

yeah it sounds ace. brill job.

[@LyonsArcade]

Thank you mycatsdead!

[@dennistowne457]

Rowe used tube amps up to the early 70’s. I have a ti-1 from 72 with one.

[@LyonsArcade]

I thought I read somewhere that they stopped in 65, don't know where I got that from. That's very cool they kept going with them, I'll bet they knew down the road people would realize the tube amps had a better sound. I know the early transistor Wurlitzers were pretty crappy, I had a couple with just horrible sound quality....

[@scottgm321]

Totally awesome. Great job and thanks for the video.

[@fred_derf]

The phono-level voltages coming from a record player is typically about 0.005 volts while your typical line-level output is 0.3 volts. You can do serious damage to your amplifier if you connect a line-level source to a phono input. It's like trying to fill a water ballon with a firehose. Love the video, it's just something to watch in the future.

[@LyonsArcade]

But yet I didn’t do any damage. So I’m not too concerned

[@Tedybear315]

You and Shango need to do a collaborative video. I'm sure he would love getting into this one.

[@LyonsArcade]

Shango's the man! We don't do collab videos though, we wouldn't have much to add to his expertise! Thank you for watching Tedybear315!

[@littleman8674469]

Kudos on bringing it back to life!!!!

[@gregbarraball4266]

Awesome job! That is a beautiful jukebox.

[@LyonsArcade]

I like it. The AMI's aren't very respected and it's a shame. Nice little boxes.

[@yuwish6320]

Analog > digital when it comes to sound quality. My father had a tube amp he made from a kit. Had great sound, especially when you put the Rolling Stones on it.

[@LyonsArcade]

I'll bet they EQ'd those old records to sound good on jukeboxes anyways! Thanks for watching Yu Wish

[@b.o.353]

Oh that’s amazing! Very cool.

[@LyonsArcade]

Thank you B. O.

[@jonasodhe2337]

Sounds awesome! 👍

[@mdouglaswray]

Man, that is one SCRUFFY circuit board. You're a brave man!! If you're captured or killed, we'll disavow any knowledge of your actions! (cue Mission Impossible theme)

[@LyonsArcade]

they just look really bad they're not that complicated if you look at the schematics. Just have to make sure nothing is touching the wrong thing somewhere :)

[@iamjtbe]

Those old tube amps NEVER catch fire! Come on people... Great job!

[@PlumGurly]

Actually, I've seen that before, and a bad capacitor was the blame.

[@indydriver80]

Smooth!

[@LyonsArcade]

It’s pretty slick!

[@frankgagliano9677]

Man that sounds great, I bet it has sounded like that since it came off the showroom floor. It reminds of shooting pool at my grandparents basement and listening to the Glenn Miller orchestra records on there record player. Thanks Ronnie

[@LyonsArcade]

Thank you Frank! Everybody's going to love your videos when we get to them, I was looking it over a little bit today. What a nice little machine....

[@Jason-lx3zu]

22:11 haha you crack me up! I'll never talk you out of spending money. Awesome of one of your viewers to send you a cap meter

[@izzynutz2000]

A couple of good channels that I like to watch that go back to these old tube amplifiers is a channel called mr. Carlson's lab he does a lot of antique tube radios and Tube amplifiers and has specific tools that he will send you the descriptions and schematics that you can build yourself and the other is Brad the guitar ologist he works on mainly guitar amps but it's the same principle and it shows how to go through and check and what to look for and plate values and tubes and capacitance and resistors just an FYI...

[@clipdigger]

the records you were playing sound like ww2 soda shop favorites

[@LyonsArcade]

I know, ain't it great????

[@ericturner7162]

Sounds great! I even like the music you found. Lol.

[@Nunya_Bidnez]

Shout out to Neil H for being a good Human.

[@LyonsArcade]

His timing is impeccable

[@ryanpearson9534]

Wow actually sounds great

[@LyonsArcade]

Nice little box…

[@labnine3362]

My 1973 ROWE AMI has a tube amp. Looks very similar under the hood to this one too.

[@LyonsArcade]

That's pretty cool, I didn't realize AMI held onto the tube amps for so long, i'll have to look into that, it may be a selling point. Thanks for watching Lab Nine!

[@labnine3362]

@@LyonsArcade Here's a video I did (different account) over 10 years ago of it. It's been sitting in my garage for a while now... been meaning to play with it. Rowe AMi Ti-1 Seville Jukebox 1973 kzbin.info/www/bejne/h5_KaJd5iaqggNk

[@ovalteen4404]

I remember the advice on testing wax caps from Mr. Carlson's Lab: Don't bother. Throw those suckers away and get polypropylene or mica replacements.

[@LyonsArcade]

That's what I've done in the past but it's fun to check them and see how off they are. Thanks for watching as always Oval Teen!

[@arthureverett8220]

Nice job on the jukebox We used a solution of Wildcat cleaner that removes nicotine stains from plastic and mechanical parts and removes dried grease The jukeboxes look factory fresh We also use it on pinball parts and video game consoles

[@markjackson1444]

More great work Ron. … the tubes should ensure that the sound is Big, Warm and Fat. ….that’s right- tubes makes the sound ‘fat’. … that’s what they do for guitar amps, and should work the same here.It sounds great. It looks great too. Another 20th Century machine saved for folks to enjoy in 2022. Very cool Ronnie. A+++

[@LyonsArcade]

We’re gonna put it through the paces Monday….

[@jim8230]

A variation of that tube amp was used all the way up until the TI-2 model. It was a great sounding amplifier.

[@64ssmalibu]

I would think if your not monetized they wouldn't bother you. I've watched several other videos here with jukeboxes and guess they aren't getting hit as their videos are still up. Sounds great, keep plugging away Mr magic man.

[@AiMR]

They usually put a dotted line around those packaged circuits on the schematic Ron. They are a precursor to the ICs you are very familiar with 😉

[@zulumax1]

Those "couplet" multilegged devices are usually capacitor and resistor networks. If you are lucky they gave you values in the schematic in case you have to DIY your own version.

[@chrisingle5839]

Swing on a Star!

[@LyonsArcade]

What a song

[@InMyHead]

Reminds me of the ballroom music from The Shining. Another great video Ron!

[@madbstard1]

Shazam didn't recognise any of those tracks :D I was able to guess only one - Swinging On A Star. Wish my mum was still around - she would have identified them all in a second! Great job on the refurb so far. The sound is so beautiful and rich.....tube amps are the best. I have a couple of old tube guitar amps that I need to rebuild but finding the time is the biggest problem.

[@paulclarke7571]

38:25 URIKA! Thanks for resurrecting the dead Ron and having fun while you do it. Always a highlight of my day.

[@mycatsdead]

sold my heavy metal mother'@@@@@ guitar amp last year it was beautiful but you would not touch the back board. it had a phaser built on it the lot. and it had been gigged. had a load of tubes to fix it. the old juke boxs are so cool. i knew you would fix it. if it wernt broke. please i want a t shirt. the postage is so high to get one here. present from my fav cousin.

[@ginkumpow3726]

🎵 Swinging on a Star 🎵 (Dam I feel old now)

[@LyonsArcade]

Heidy Heidy Heidy HIIIII

[@greendryerlint]

Joe, the tube testers are not too expensive when you can find them. I bought one at a "Hamfest" for about $30 and the 2nd one I have (yeah, I have 2), a friend found in his father's attic when he was cleaning out the house after his father passed away and gave it to me. When you get an extreme hum like that, it's usually bad capacitors. It puts a hell of a load on the transformers and tubes and will fry things if left on. Despite their 'reputation', usually tubes are pretty reliable and don't fail unless another failed component cooks them. I'm not any kind of guru but often tubes that are 60+ years old are just fine. But you have a good instinctive troubleshooting sense and I'm sure the learning curve is like a small bump for you.

[@elitster]

Great work!

[@gregoryschmidt1233]

But other than the gripper arm, it was working fine when they sold it! ;)

[@LyonsArcade]

That's exactly what they told us. Just needs a new gripper arm. They didn't mention the amp was fried, three tubes were bad, the needle was missing, the basket was off track, the selection system didn't work, the turntable didn't spin and the annunciator was missing. Luckily we buy things broken we never buy things as if the gripper arm just needs replaced, LOL

[@valkokir]

Fun fact about that meter. When it's about to auto power off it will beep a whole bunch. This will always happen when you've stepped away into the next room working on something where you can't figure out what the hell is beeping.

[@Buckeystown]

That reminds me I have a t-shirt with a bunch of tubes on it including a 12AX7 which I think is a dual triode. I wonder what became of my RCA tube manual from my tube theory class?

[@redwineripple]

Great real nice

[@LyonsArcade]

Thank you ironhook!

[@douro20]

The type of tube tester you're thinking of is a mutual conductance tester. It is certainly the best way to test the function of a tube outside of doing it in the actual circuit and it allows you to make a matched set if necessary. A simple emission tester is good for most purposes. Filament testers do have their utility if you need to quickly go through an odd lot of tubes to eliminate those which have a bad filament.

[@DLexEdition]

Dude, you can build a tube test that gives all of what you need and more, either analog meters or both. AC sets have a heater (filament) that occasionally burns out, not just the screen, etc. DC sets don't have heater but they have all the other parts to a vacuum tube. The most common on the old tube amps is loss of vacuum, either outright or overtime. Also, you can check for a bad tube easier, if the unit is working to some extent, grab a bamboo chopstick and lightly tap each tube on the top, just to the side of the thermal vent (the pointy tip, on some tubes). If you hear pinging or ringing sounds through the speakers, that tube is bad. That test is checking for microphonics, it has to do with vacuum and the bonding wires on the plates, screen, etc., if they're loose they will make pings, rings, occasionally a motorboat / ray gun sound. Some people think those are condensers (we now call them capacitors) that are bad, however, it's not all the time it is them but check those first to rule it out.

[@jasonsteverson4609]

'64 was a good year. Notables: -First year of the Pontiac GTO. -'64 Jim Beam bottle used for I Dream ofJeannie. -The freakin' Munsters!

[@IDPhotoMan]

It would have been pretty cool if they had designed those Amps to show off the glowing Tubes in some sort of window. My pre-amp for my turntable is pretty neat when they glow a bit.

[@LyonsArcade]

They had some radios back in the day with a magic eye (visible tube)

[@PlumGurly]

As for capacitors that read really high, they are not usually that high in the circuit. I forgot why there is this discrepancy. You can learn about it on Mr. Carlson's Lab channel. But it isn't good, and those still need to be replaced. Really, you need several different types of meters to fully analyze a capacitor. If you replace wax ones with non-eletrolytics (like rolled mica/foil), then you should use a polarity tester with them if no polarity is listed. Whatever electrode is closest to the outside of the capacitor should always be ground. The issue there is not damaging the capacitor, but noise. So if the ground is on the outside, it acts as a shield. Mr. Carlson's Lab also teaches how to build test equipment that doesn't exist or is hard to find. Another thing to test is ESR (equivalent series resistance), and not all meters test for that. When fixing tube radios, you don't want to touch any old mica capacitors in the sections related to RF and IF tuning unless they are really out of specs. They might have been hand-picked at the factory (making the listed tolerance irrelevent). So if you change those "just because," you could screw up the ability to align the stations with the display. Now sometimes, if an RF/IF transformer has a bad capacitor inside, you may have to slide it apart and change that since you might not be able to get the transformer.

[@davidh6713]

The part of the schematic you are discussing is called a pentode push-pull amplifier.

[@LyonsArcade]

Thank you David!

[@1pcfred]

Good job.

[@jasonhale4639]

Those capactitor meters work good for getting the capacitance but they don't test for leakage under working voltage. I actually have an old heathkit condenser tester that puts voltage up to 450 volts across the cap and shows on an old eyetube how leaky the cap is at what ever voltage you select. Usually you would select the working voltage of the capacitor you want to test. It will also tell you the value of the capacitor. I did recap the old heathkit and it works excelllent for leakage testing because sometimes you get the correct value for a cap but it will leak current through it way below it's working voltage. It's a HEATHKIT condensor checker model C-3.

[@nickk6109]

Probably want to look at the caps with that hum!

[@jonathanhorne6503]

That type of cap tester can sort out values but not leakage. For leakage you need to apply operational voltages like you would get using a Heathkit IT-11. I think the Heathkit will test to 500 vdc. Good video, I have the same amp on my bench. It’s done except for adding bias pots and final testing.

[@LyonsArcade]

What are you waiting on, you seem to know much more than I do about it but yet you're waiting on bias pots and final testing. Mine's rocking and rolling. what else should i do next time?

[@senilyDeluxe]

Just repairing a Rock-Ola 469 (1976), one of the preamps is noisy. As in "fireworks going off two blocks " noisy. It has one of these Packaged Electronic Circuits and the noise came out of one pin. Swapping the PEC with the other identical preamp made the problem wander, so that would have been Game Over unless I happened to get lucky on Google and there was an excerpt from the schematics which even showed what was inside. And the bad pin is just a 150pF capacitor, nothing else! (the owner still has to disassemble, clean and lube the mechanism, it's jammed solid, it can only move enough to raise and lower the tone arm)

[@LyonsArcade]

After looking at the schematics again yes it shows what's in it on these too... you could just make it with discretes I guess. Thanks for watching SenilyDeluxe!

[@ajsmith5295]

I had the same jukebox.

[@clumaster]

sort of miss the good ol days when you could take your tubes down to the local hardware store to use their machine to test them.

[@ericblack1477]

I was down the road from ya about a month ago, I went to the junk yard about a mile or so from town went and picked up a old Toyota Corolla from there with a friend if we didn't have the car trailer with us I was gonna stop by.

[@LyonsArcade]

Yup you were like a mile away, I'll bet I know which junkyard you were at. I'll bet it was the one on Black street!

[@ericblack1477]

@@LyonsArcade yep

[@fred_derf]

6:15 We're Rockin' now! And by "rockin'" I mean we have a bag of rocks rolling down a hill…

[@ETPinball]

I've fixed lots of EM ans SS pins, and pretty often I want to get an old jukebox to fix. Then I see inside the amplifier and I'm like nope!!! LOL

[@fimbles1015]

The wonderfull sound of the perry gardner orchesta :P ???

[@dkd1228]

NOS 7868 (large 9-pin Novar base), 7591 (octal base) or 6GM5 (regular 9-pin base) are functionally the same. They are expensive. There are eastern European versions available.

[@LyonsArcade]

Thank you DK D122! I'll have to keep in mind if I run into an AMI it's got a couple hundred dollars worth of tubes in it if they all need replaced! Thank you for watching!

[@ajmills522]

What were the 2 songs played? They were great! LOVE YOUR CHANNEL!

[@EsotericArctos]

I know people can't resist plugging things in to see if they work. It can be dangerous, even for only a minute. Old filter caps sometimes have a tendency to short and if the equipment is old enough to have paper and foil "wax" capacitors, they can often be electrically leaky and very quickly kill output transformers or even power transformers. The tubes are generally pretty reliable. If the Getter looks good, then the best way to test a tube is in circuit and see how it behaves. I'll watch the rest of the video now and see how it goes. By the way, those "Wax" capacitors pretty well looked like a "candle" from new. They are a paper and foil cap that is dipped in Wax. Usually it is recommended to replace all of them in a restore as the insides deteriorate and the start leaking DC through them.

[@LyonsArcade]

Thank you Brendan.... I've done a bunch of radios in the past and I don't usually even plug the pinballs in but I figured for the video we'd show people what happens. The issue in this case I believe ultimately was bad tubes, the caps were off but I don't know if they were off enough to completely block the sound like that. Wait till I do the tube video, I can't wait to read everybody's comments on that one :) Take care man!

[@EsotericArctos]

@@LyonsArcade There will always be experts. I agree the caps alone would not have killed the sound totally. I love watching channels like Mr Carlson's Lab for the radio restores :)

[@stphinkle]

If you do plug in a tube device for the first time, it is a good idea to at least use a dim bulb tester or put it on a variac and not give it full voltage or full current. Having a dim bulb tester, the bulb wired in series with the device will glow dim if it is safe to operate or bright if there is a short protecting the device from shorting.

[@EsotericArctos]

@@stphinkle And an isolation transformer. Even if it is a transformer set, they sometimes have paper caps across the line, sometimes called the "death capacitor" that can cause the chasis to become live

[@PlumGurly]

The deal with capacitors in tube stuff is that you can blow tubes or transformers that you can't get. BTW, the transformer for the speaker's field coil often doubled as a power transformer to get the voltages for the tubes, so that's another reason to not operate it with bad capacitors. If you blow that, you're often screwed. The transformer I mean is the one driving the field coil on the speaker since the really old speakers were made before using permanent magnets in them became a thing. The driver coil was still attached to an audio transformer, while the field coil was often in series with the B+ voltage for the rest of the unit.

[@douro20]

I'd hate to have to replace those 7868 tubes; they are quite expensive and they need to be a matched pair in each channel.

[@LyonsArcade]

I didn't realize those were so expensive!

[@pegbars]

A capacitance meter is really only good for checking the value of unmarked caps. It doesn't test for leakage current, which is the main failure mode of electrolytic and paper caps. A cap can read exactly on its marked value, but be totally useless because it's leaky under applied voltage.

[@jasonudall8614]

Amp sounds pretty good? Sir I can't hear the amp over the music

[@holgers5216]

with ANY old tube amp/preamp, you really MUST use a variac, to slowly bring up the mains voltage and keep an eye out on the high voltage B+, filament supply etc.. Probably most of the caps are no good, they would be 'leaky', especially the power supply can caps! Things can go south VERY quickly, since we are talking about high voltage DC, anything up to 400VDC or possible higher! Not a very good example shown here.

[@LyonsArcade]

You have 0 videos.

[@holgers5216]

@@LyonsArcade what has got me having 0 videos to do with my comment. What you did was quite reckless and not a very good example on how to go about testing old tube gear. FYI, I've been working with tube gear for close to 50 years, so I'd like to think that I know a few things about tube amps and preamps.

[@naytch2003]

@@holgers5216 Well then post a video of yourself showing us all how it should be done otherwise fuck off and watch somebody else's channel

[@chrisrhodes5464]

When testing transformers you can check the center tap to each side and the ohm's should be about the same for both sides if one side is much higher or lower than the other then the transformer is bad

[@Zerbey]

Could you also just swap in a modern phono amp since it’s just RCA plugs? Sacrilegious I know but cheaper!

[@PlumGurly]

If new capacitors have slightly low readings, that may change with time. When you get to things like motor capacitors, they may test bad at first until broken in, or so I've heard.

[@LyonsArcade]

That's interesting...

[@PlumGurly]

@@LyonsArcade -- I don't know why it is, I guess it has something to do with them sitting on the shelf, and maybe gas bubbles get trapped between the electrodes or something. And what I said only applies to electrolytics. If gas bubbles are involved with the phenomenon I mention, then it obviously cannot happen with other capacitor types.

[@Mrshoujo]

Next you have to adjust the needle downforce pressure.

[@yesitreallyisme]

Sounds sweet for an old girl.

[@andrethib]

enjoyed the video as usual. question for you, Ron, have you seen those solid-state replacements for vacuum tubes? they are lots cheaper than real tubes, don't know about performance or reliability

[@beavis6363]

Question Ron (or commenters). I recall that you showed two spindle diameters driving the idler wheel (for 33rpm or 45), and that you tuned the height of the idler. Does the machine have the ability to switch rpm, or is it set to either 33 or 45 permanently?

[@WreckDiver99]

Ah yes...going into the local drug store and hardware store, seeing the big tester sitting there near the door. Fond memories.

[@jussikuusela7345]

If it hums, at least one side of the audio transformer primary is good. Sometimes you just have to spend money to be able to make money. Capacitors that leak internally (turning into resistors) may read higher than their spec on a capacitor meter. You may know Paul Carlson's channel, he is a guru on tube amps and such and he has designed, among other things, a capacitor leak tester that works with ordinary batteries and low voltage. You can build one yourself, I think the schematics and other info are available on his Patreon at least. And boy does is sound awesome, as far as I can tell over the KZbin. LOL!

[@mikemiller659]

Did U select A19 ?

[@LyonsArcade]

kzbin.info/www/bejne/aJi0k2l5arWKjKs