Dave, USB's wear out quickly and 3.5mm jack plugs do not , jacks also rotate

Mailbag really is my favorite segment.

The TTC CT-1001 VOM was my first meter back in 1969...mom bought it for me at a real life electronics/surplus store in San Francisco where the surplus stores lined up along Market Street. Still have it to remind me of the good old days!

Violated the first rule of eevblog, don't turn it on, tear it apart! Paging Mr Carlson to replace those wax caps!!!

Let's have a 2-minute restore here. Replace the old selenium rectifier with some 1N4007's, replace the wax-paper caps and the (no doubt leaky) electrolytic cap, and I'll bet that old VTVM will work like new! Nothing like some nice vacuum bulbs - none of this IC rubbish! :)

Ooooh i'm loving that ST PSD8XXFX in that labelling machine! Seems so immensely useful!

41:05 - looks like my very first meter. Good unit. It served me well.

Waiting for the mail bag like for ever.. thanks Dave!

On the VTVM the battery is used for the ohms scale. The connector was commonly a microphone (unbalanced) connector. If I were "updating" the device I'd make it a BNC connector. Typically the input impedance was 1 meg ohm, and the "probe" added another 9 megs to make it a total of 10 megs.

Finally, a new mailbag!!! Thanks Dave!!

On the aluminium can cashing there used to be in Australia and the UK, I had a place in Boston Massachusetts for a while and when I was over there I found that all cans and bottles had a deposit on them and it was almost impossible to cash them in anywhere, nobody wanted them but the state/county/council would happily take them for free in the recycling bins that were everywhere.. They are trying to bring in compulsory deposits in the UK and I can see it going the same way, nowhere to get back the deposits, just an extra tax with the state collecting the cans/bottles to sell on for recycling

I own a Friden EC132, which added a square root key. It came out a few months after the 130. Also own an SCM Cogito 240SR, which is a cool old machine. There's some history between the two machines. Stanley Frankel designed the 240SR, and was a mathematician who worked on the Manhattan project. He had been censured over his views on the direction nuclear development should follow. That basically barred him from government work, so he went to Marchant with an idea for an electronic calculator. Marchant (who had either just merged, or was in the process of merging with Smith-Corona... I don't recall) was interested in the idea, but not the risk. They decided it would be better to offer to license the technology to their competitor, Friden. If the product failed to sell, Friden would take the loss, and if it was a success, they could collect royalties... Friden, rather than taking the bait, said they were not interested. Instead, they rushed their own design to market, beating the Cogito by months. Friden's design was huge, clunky, and wasn't all that efficient, design wise. It did introduce RPN, if only for the fact that it made the hardware design simpler. Ultimately, it did work though. The Cogito 240SR had an unusual input method, and an unusual output that could effectively count to infinity, at the expense of discarding least significant digits, and outputting a marker on the display that allowed you to keep track of the number of display overflows, so long as you manually counted the transitions. The Cogito was markedly smaller, and weighed a slightly less. It had a much more compact, narrower design, Had a wider variety of input options (like a grand total mode, and the ability to manually swap the contents of registers). I love collecting old calculators, and those old models from the 1960s are some of my favorite ones!

L.I. is Long Island. That's the large island at the bottom of NY State that part of NYC is on (Brooklyn and Queens) as well as two other counties (Nassau and Suffolk).

The VTVM is from the 1940s. The battery will be for resistance measurement. Precision Apparatus Company made some very nice equipment.

I still use a VTVM for old valve (tube) TV and radio restoration. You can use a modified N type connector for the input and the battery is just for ohms, it will not power the meter. They are really good for high impedance valve work.

The original San Jose light tower that was built in 1881 collapsed in 1915. There is a half size replica of the light tower at History San Jose's History Park.

I am not an expert but 1080 looks like 480p... strange.

@John_Ridley

7 жыл бұрын

Also if you view it soon after it's posted the HD versions won't have been processed yet and it'll fall back to low res versions.

@awesomeferret

7 жыл бұрын

Robert Lach that's only because he used a bad deinterlace method. 1080i can look as good as 1080p if deinterlaced properly.

See Mr Carlson's Lab's video on VTVMs if you wanna keep it. If not I may/may not be willing to pay shipping to the US.

@budude2

7 жыл бұрын

Thought the same thing!

@LumaControl

7 жыл бұрын

Charles Thompson i

@gip-gipsr.1524

7 жыл бұрын

PC GUY 1241 ya mighta hit the enter button on accident

On the VTVM the D cell that would be in battery holder was to provide a voltage for the ohmmeter--all VTVMs had them. There was no way it would power the whole meter.

David- the San Jose Light tower was at the intersection of Market and Santa Clara streets but came down in a storm at 11:55 am December 3 in 1915. There is a 1/2 scale replica at the San Jose History Park today and an effort to rebuild a modern replica of the original at the same location is underway.

The multimeter connector appears to be an Amphenol 75-mc1 series connector,

@linagee

7 жыл бұрын

Looked a bit like a garden hose connector with a center pin.

@russellhltn1396

7 жыл бұрын

I've seen it before - I think it was used as a microphone connector - a quick Google confirms my memory and gives me a name: SwitchCraft 2501F.

@cdw4255

7 жыл бұрын

It could also be used with a Heathkit 432-1. But yes, it was used as a mic connector.

@n2n8sda

7 жыл бұрын

Yes thats correct.. Amphenol "microphone" connector.

Great to see a mail bag segment, seem like it's been a while. I don't think that you need a "key" light. Thanks Dave and Hi to Dave jr...

PACO Model 68 - Dave, replace those old waxie caps! Then check transformer secondary voltages to see if it is burnt out.

Viewers in florida are indeed called floridians Dave! You got it.

We need that super computer cluster Dave!

David, that's Glendale, NYC. it's in Queen one of the 5 boroughs. I used to live in Glendale back in the early 70's.

@phamuc11735

7 жыл бұрын

Long Island ... Home what was Grumman....Lunar LEM...F-14

The LI stands for Long Island NY. Glendale is in Queens, one of the five boroughs of New York City. The connector is an Amphenol type used back in the 50's and 60's. Many microphones used them. The meter needs a D battery for the ohms function to operate.

That solder paste dispenser is interesting. I have never seen one that isn't pneumatic before. I hope you will make a video using it to assemble a board. It seems really bulky compared to the pneumatic one I use.

i assume they used the phono plug for power on that dispenser thingy because micro isn't as tight of a fit. it'd probably fall out while handling. also people would plug standart usb cables into it even though the pinout would be different on it (which would be bad).

@ecofuelbox

7 жыл бұрын

During the Kickstarter campaign, they discussed with their backers, and decided to use 2.5mm jack instead of micro USB, because micro usb is also quite fragile.

What did they call the VTVM in the UK and in OZ? Valve Volt Meter (VVM)? Anyway the battery was only for the ohmmeter function. I wondered why there were TWO 6AL5's, and then I realized that the second one was for the rectifier function in the power supply. Most VTVM's used a selenium rectifier or a diode in a half wave rectifier. The other 6AL5 was the AC signal rectifier for use on the AC volt meter functions.

DAVE ---> L.I. = Long Island also, replace all of the caps and it will work fine! - the tubes are likely OK!

3M is the only drug Dave needs aaaaahhh I need that Silicon Valley book ASAP and the solder paste dispenser would be cool to mount on a CNC machine... Hook into the trigger connection and Bob's your uncle

@danielsullivan87

7 жыл бұрын

Given that I'm printing up a new multi-attachment holder for my CNC machine, I thought the exact same thing... especially since I'm using it for PCB rapid fabrication.. mill.. drill... solder paste... pick and place - you've almost got your own assembly line right there

@leisergeist

7 жыл бұрын

Daniel Sullivan Exactly! Brilliant

why not send it Mr Carson's lab? He would get it working.

@jasa_m7990

7 жыл бұрын

for sure! I would love to see a colab between these two!

Would love to see the paste dispenser in action - looks a really cool piece of kit.

I was going to order one of those T-shirts but it is not showing as an option, I only have Fluxgate Condenser, Negative Feedback and Warranty Void if Not Removed

I still use a Heathkit VTVM for radio alignment and other tweaky kind of stuff.

I remember being a kid and my dad saved cans. We had to go through with a magnet to "weed out" the steel cans.

At 19:45... the circuit seems to have a short between pins 4 and 5, of U1

@3:50 making puns without realizing it. "If I ever get the damn thing finished" *FINNISHED - supercluster baged from Finland* @5:40 it brings out the gray in your hair! DOH! Model 68. I almost thought it was a new minion.

My first multimeter 45 years ago was just like Dave's. Unfortunately my brother and I shorted it out one day and burned up a big chunk of the pcb. The last meter I killed was a Wavetek 27 when I accidentally measured the HV on a CRT. I sent it back to Wavetek and they gave me the newer version for $50. Nice.

I love how Dave recently covers more volt-nut topics in vid here and there :D. Thanks dave. Maybe you should make an episode about who are volt-nuts and why they are crazy folks :D.

I didn't find the link to the shirt on the blog. I kinda want one of those.

'Floridians' is correct! And, it looks better with the lighting, more professional...keep it up!

So I just tried subtitling this and it's hard af... Dave doesn't end half of his sentences.

Interesting bit - if you look at the box from a distance, it looks like it says, "Hextpuder" (maybe it has a micro w/6 cores?) :)

Hey Dave, RE: The light tower in San Jose?, it lives on in 1/2 Scale in the San Jose Historical Museum. Cheers!

backlight helped, might want an acoustic baffle in there too, it's echoy

4:57 - converting 1440x1080 to 1920x1080 seems to be the biggest quality issue. Up until you mentioned the lighting *something* seemed off with my picture but it wasn't the lighting. Oh well... bet you will be double checking the recording mode next time! ;-P

Hmmm that is nice solder paste. Low temp melting point and Tin Bismuth Silver so it lasts longer than the ordinary bismuth. Expensive stuff actually. Apparently I beleive IBM used to or still does use the Tin Bismuth version.

All I can find on that VTVM probe connector is "Amphenol 75 series", but I'm sure it has some other nomenclature. Bueller? ...and the worst part about of the old meter is the PIO caps, but you already have been pointed to Mr. Carlson's Lab, so you know this already.

Now THAT'S a knife! 😝 Yay Crocodile Dundee! 🙌

I grew up using my Dad's old VTVM. It was a simpler cousin to the one you got. BTW: The battery was to operate the ohms ranges, not the meter as a whole.

P/S, he has a nice site and has a voice you could listen to all day, every day.

I remember that Friden 130 & 132 trying to develop a pocket calculator broke the company which was defunct by 1965

should send that VT/VM to Dr. Carlsons Lab.. He could get that bad boy working and in short order!

I'm curious about that LED light... what Brand/Model was it?

The 555 T-Shirt is brilliant :-)

That vtvm connector goes to a probe with a vacuum tube at the tip.

In case you were wondering, and by the off chance you see this, Glendale L. I. NY means, Glendale, Long Island, New York. Cheers!!

I don't think there was "heat-shrink" 40 years ago a lot of components used that transparent lead protector tubing. I used to salvage it when I was a kid.

4:17 Are you talking about an iMac G5?

I still use transistor tester to match transistors for Pre amps an class A Amps

What would happen if customs needed to open that wood box?

@ecofuelbox

7 жыл бұрын

That task maybe to complicated for them. They will probably scratch their heads and let it pass the border "as it" ;)

Something is weird with the video quality... I'm on 1080p but it kinda looks like good a scaled up 480p version.

8:45 - the battery is used in the Ohms ranges.

That's a switchcraft microphone jack. Very common on old test gear.

what happened to that Altium building you rented?

I wouldn't be surprised to find that you have to have a battery in the VTVM *AND* plug it in to mains to use it. The mains to run the filaments.

@Sloxx701

7 жыл бұрын

I think the battery is just for the Ohms range, at least in my IM-28 VTVM it is. AC/DC ranges seem to work fine without it.

Just tried the link to your T shirts and they seem to sell all the shirts but the Triple 5 one.... huh?

That connector on the tube multimeter is so unique, that it might have been used to repair *electric chairs* or something.

I need a new butterknife, where can I buy one like the one you are unboxing with?

No NE555 T-shirts available :(

Pi Cluster last video was 8 months ago. Still keen on seeing the outcome :)

Tell me you visited the Saturn V while you were in Florida Dave. If not what did you do here man, look at alligators?

@markg735

7 жыл бұрын

I take everyone who visits FL to KSC for the Saturn exhibit. It's one of the best things to do here.

+3:52 Dave, now you definitely can/have to get it finnished :-) (pun intended)

That tube meter was made in the state of NY Glendale, Long Island. USA.... Not far from where I was born... Nice.

pop in the background? sounds 3D to me too, lets get the glassses......wooooooooo, sooo coooool lol

L.I., N.Y. is Long Island New York! We used to make the original Swingline 747 here too!

On that vtvm the caps need to be replaced asap they go real bad over time also that battery is for ohms not anything else, cheers dave! I would love a vtvm, you just can't find any worth working with sadly

What a haul! What a haul!!

Everyone, quick, send lots of chocolate to Dave! In a month, he should have enough chocolate to die from.

@tohopes

7 жыл бұрын

We can turn him into Counselor Troi from Star Trek.

Please send that Precision meter to Mr. Carlson's Lab so he can refurb it. He specializes in those point-to-point circuits. All those caps have to be replaced.

thats ferrite shielding tape sheet on top on that fit bit :)

That Fail-Sign :-) Looked like Wile E. Coyote, I was waiting for the Road-Runner.

TC-1 could be Tandy Corporation? It would make sense given the style of the front.

Maybe try to put the color temp of the backlight a bit lower. But probably its no good for those close up shots.

Congrat's on passing your Ham Radio licence- Dave !!!

Reminds me of what my grandfather left me after his term for McDonnell

Try to use 3200K on the lights and manually set your camera white balance closer to daylight or possibly the greenish florescent color temperature spectrum of around 4800K. But just for the Face shots. For the Close-Ups it could be too warm (or cold, depends on the shown colors).

Quality at 1080p literally looks like a bad 720p.. what's happened?

TBH, if you didn't mention anything about the added light, i wouldn't of even noticed. YAAY!!!!! mailbag-uh-doody time!!

Precision Apparatus merged with B&K in the 60's to become B&K Precision.

Hey! I live in Lyon too and love your work! Keep it up :)

Hi Dave, Great Hoard from Shimodo. I take it they are from Finland. Fazer Chocolate is fab. I was told by my Finnish Colleagues once that it was pronounced Fat-zer :)

I live in Oviedo FL also, and yep, you said it right! I'm honestly shocked there's another viewer here in my small city.

@AmRadPodcast

7 жыл бұрын

Michael MacEachern great place to live! ;)

@hakemon

7 жыл бұрын

It sure is, I still like it, despite the concrete jungle it's slowly becoming. As long as it keeps the old country vibe, I'll be happy. Shame the original Townhouse was torn down. Finally got to visit the new one, and it wasn't bad, great location next to the trail.

@AmRadPodcast

7 жыл бұрын

Michael MacEachern moved here 2 yrs ago, never got to the original Townhouse (no parking). New one is ok, very busy. (I sent in the meter FYI) check Dave's description for my channel on KZread. Work at Siemens per chance?

@hakemon

7 жыл бұрын

I figured it was you. ;) I moved here back in 1998, where things were soooo different. For example the Publix off broadway and Lockwood, didn't even exist back then, that entire plaza wasn't even there. (I live off of MH). I don't work at Seimens, currently actually I'm unemployed, have been for over a year, since my contract with SCPS expired. Been trying to work at home on my own thing---while not doing too well. So I am going to be in the market again for a regular full time job.

hey no matter how Silly they go on their naming their marketing seems to be spot on... I discovered SILEGOs OTP Greenpaks in a previous mailbag video and am now currently using on a couple of products (as low cost custom PMICs) so yeah keep em coming SILEGO

2:57 AM here in England and I'm here

This video uploaded on my birthday!

45:25 I wish all of my equipment had an ICO mode. :-)

Yes, Floridian is a "thing"