- 2024
- May
- 19
Hamvention 2024 - Saturday’s Stuff I Didn’t Need (mom it followed me home!)
Saturday was a good day at the Hamvention. It was warm, things were drying out, and everything was open. A few vendors appeared to have left, but there’s always some that only attend Friday, expecting it to be the big day.
The mix of products has changed over the years. Gone are the big stacks of old test equipment, piles of old radios and televisions, and the endless sea of Watkins-Johnson equipment. CBs have faded as well from their peak a few years ago, and computer equipment is all but gone save for a few “classic” machines and newer hard drives that got replaced in the never-ending “moar stoarage!” quest. Hobby gear from the 60s seems to be common right now, with big radio gear still being common but lessening.
I picked up a few things Saturday:
I picked up this Eico power supply. It’s designed for tube work, providing 400VDC and 150VDC for plate and biasing. There was a second one, not working, and I was going to offer on both but the dead one sold first. Probably for the same thing I was going to use it for - parts.
The little Heathkit meter is AC only, but the meter goes to the middle when it’s turned on. Something leaky or shot, most likely. It was last calibrated in 1995, was used by Southwestern Bell, and the cal house was in Dayton. Kind of a cool thing.
A manual for both items is in order before use.
This Squeezebox Touch was in a box of random devices. Logitech used to have this awesome music player system that you ran on a server at your house, and you could connect multiple music players to it that played streams or your local library. They discontinued it because I guess you can’t sell ads in a service you run yourself. Regardless, the players still work fine and this clean example of one of the touchscreen models was cheap. I need to try it out, if it’s dead then oh well.
The other items are AC line testers. Unlike most, these have 120, 220, 380, and 440 lamps. At a buck each, I bought 3 and will toss them in the toolbag.
That’s all for Saturday, I was planning to (and did) go back on Sunday. I picked up a few more items to take home because vendors were willing to deal so they didn’t take it home. Stay tuned!
Links to all the things I drug home this year:
Friday https://wereboar.com … d-in-my-car-i-swear/
Saturday https://wereboar.com … it-followed-me-home/
Sunday https://wereboar.com … t-because-its-cheap/
- 2024
- May
- 17
Hamvention 2024 - Friday’s Stuff I Didn’t Need (but it jumped in my car I swear!)
This year’s show started out rainy, and it rained until I was done browsing the flea market about 4 hours after open. Of course!
Really, the only thing I wanted out of the show this year was to find a Hallicrafters S38C. I had one of these years ago, and gave it to a family member. They swear they gave it back, but I don’t have it and I don’t remember giving it away. Not a big deal, it was a pretty poor example of the type but it did have a manual with it. I ended up coming home with a frequency counter - I need one to fix my other one that suddenly stopped counting, and got a good deal on a boat anchor of a signal generator. I also found what I came to the show for - an S38C.
The Frequency counter is nothing special, just a counter. It works. I saw it working at the show, so no problems.
The gods smiled on me because this S38C was sitting at a booth with a couple of other similar radios that an older gentleman was selling because he just didn’t have the time or interest anymore. It’s in great shape for the age. It’s missing the back, of course, and a knob was kind of busted. Not a big deal, the case and innards are in excellent condition.
Everything inside is completely untouched. Bask in the glory of leaky wax paper capacitors and bumblebombs.
The filters are bad, of course. That’s expected, and the 150V capacitors won’t be too hard to acquire. If I can find some at the show tomorrow that aren’t super goodly chinesium, I’ll get them - otherwise, a Mouser order is in my future.
The last item is the signal generator. It’s in ok shape for the age. What caught my eye is the beautiful flywheel tuning dial. Just a pleasure to spin and turn. It works, but has some issues - the signal kind of fades in and out. No tsure what’s going on here, I’ll open it later and take a look. However, when it does work the signal is quite nice.
That’s it. There’s one piece I told myself if it’s there I’ll get it tomorrow, so we’ll see.
Links to all the things I drug home this year:
Friday https://wereboar.com … d-in-my-car-i-swear/
Saturday https://wereboar.com … it-followed-me-home/
Sunday https://wereboar.com … t-because-its-cheap/
- 2024
- May
- 13
My favorite part of opening old devices is…
taking the cover off and finding an old battery inside. One that probably is as old as me.
At least it’s not an alkaline battery this time.
- 2024
- Apr
- 29
An Eico 145 Signal Tracer - Part 4
Not much this time, just some prep work for the big stuff.
First was to unsolder and remove the RF jack on the front and find something to put in the hole. This piece of plastic from…who knows…almost fit and will be secured with some RTV later in the project.
You’d never know, but the case was washed.
The handle and some hardware was given an ultrasonic bath to clean it.
The location and year of purchase was noted inside.
And the old, almost hard as a rock cord was removed.
Next is to start removing components. I haven’t decided if I want to do it all at once, or try to do it a part at a time. I can certainly get cleaner results removing everything and doing it all at once. I have the assembly manual, so - probably all at once. Stay tuned!
Next part of this series: https://wereboar.com … ignal-tracer-part-5/
Previous part of this series: https://wereboar.com … ignal-tracer-part-3/
- 2024
- Apr
- 29
What I took home from TUSCO 2024
I really didn’t go to this show expecting to buy much, and I didn’t - I spent $30 and brought home these two items:
The audio generator on the left works, but has a messy sinewave output. I’m not sure if this is normal, but knowing some of the other equipment I’ve had from this era - it may be. There are some capacitors in the unit with high ESR, so I may play with it a bit before making further judgement.
The RF generator on the right has an absolutely miserable output, the entire bottom half of the output waveform is clipped off - which I thought was bad. Nope, they apparently overdrove the final amp to the point where that’s the way it worked. It also is overmodulated with internal audio, so this thing was a turd when it was new. I found some suggested fixes, so I may play with it a bit when time allows.
The RF generator was a “Offer I can’t refuse” thing - the guy said take it for $5? Ok, sure!
That’s all - I did want the capacitor checker in my show post, but I restrained myself and someone else picked it up for the low price of $40. Thank you rando for saving me!
- 2024
- Apr
- 25
Stuff I brought home from Cuyahoga Falls 2024.
I did it again. Too much stuff, but I’m going to blame some of the sellers for being so congenial about negotiating on prices! (Yah right!)
So, what did I bring home this year?
Fuses.
This vendor had a lot of different values, including a lot of fractionals that will cost you a small fortune if you buy them new, so I picked up some 1/3, 1/4, 15mA, and 1A varieties. What’s kind of cool about these things is Seneca Fuse used to be a Columbus, OH corporation, and one of the boxes is marked as such. The company was purchased by an entity called Russell Enterprises, which appears to have long since gone out of business.
This is a cool little device that didn’t cost much. It’s a primitive hypot-type device that can test for leakage in a circuit. While primarily designed for appliances and other large current consuming things of yesterday, it still works great as a bench voltage monitor. It also performs it’s other functions without issue, so it was a good find - and it had the manual with it. I’m not sure what the leads were for, this device used EICO’s pin plugs. No worries, another set of leads on the bench is always a good thing!
I actually only wanted the AC Voltmeter in this lot, but the seller was really good on the price for all three, so I came home with the AC Voltmeter, a current meter, and the oddball Sanwa transistor checker. The meters are nice dampened movements and work well, but I haven’t installed batteries in the tester to see if it works. Not sure I will, those little handheld device checkers do an excellent job of sorting parts and identifying things for you.
This little meter in a case was probably part of some course offered by NRI Schools, an early “distance learning” company. (Started in 1914 as National Radio Schools, ended in 1999 as NRI - changing tides on the electronics landscape did them in.) While it’s not really of much use, the real Mueller copper clips and other test leads were well worth the price of $3. The device itself sat in a basement for some time, and it smells like it - if I can get the smell to fade, perhaps I’ll find a use for it.
Here’s the odds ‘n ends portion of the program. An apparently new Ford AM radio that I got for a put-in-the-rack project, a B&K Precision LED voltmeter that matches my capacitor checker, and a surprisingly well written TAB book about early microprocessors. I say “well written” because TAB would publish almost anything. Some books were pretty good, but some were literally nothing more than a guy who wrote a book about taping LEDs to various things and called it “101 electronics projects.”
I don’t need more of these, but they were a good price for functional units, and they’re starting to get outrageously priced. These were checked for operation, and will go into storage as parts donors - or perhaps as resale units once cleaned up and re-capped. Who knows?
In all, it was a good show. I didn’t need to drag home some of that stuff, but I did. I’ll see you at the next show this weekend!
- 2024
- Apr
- 7
An Eico 145 Signal Tracer - Part 2
It’s not really important to operation, but having clean knobs and lenses on indicators is always nice. Since I have an ultrasonic bath, I’m going to use it.
The knobs on this guy are pretty cruddy, and the power indicator has a spritz of bronze paint across it.
While I’m removing the knobs from the volume and function selector, they get a shot of deoxit to clean and lube them.
Everything goes in the bath for 20 minutes.
In the end, they all come out nice and clean and ready to re-install!
Parts have been ordered, we’ll go through those next.
Next part of this series: https://wereboar.com … ignal-tracer-part-3/
Previous part of this series: https://wereboar.com … ignal-tracer-part-1/
- 2024
- Mar
- 28
By the power of the sun!
Remember these things? One of these kits (the 160-in-1 to be exact, which I still have) got me into electronics.
This one is a kit that I always wanted to get, but it never seemed to be available when I had the money. This particular example came from a popular auction site, new in box - even the crappy earphone is there! And yes, I plan on sitting down with it and building a few of the things in it.
It’s kind of a shame that stuff like this isn’t as easily accessible as it once was. Certainly, parts, microcontrollers, and other electronics are far easier to find - but this guided, all the parts are there all the time, no extra stuff save some wire needed kits don’t seem to be around these days. Perhaps the limited use doesn’t appeal to people like it did then?
Regardless, I didn’t necessarily know what the parts were doing, or why, but I knew I wanted to know more.
I salute you, humble kit of parts. You were (and still are) a wonder in a small box.
- 2024
- Mar
- 24
An Eico 145 Signal Tracer - Part 1
( Read the first part of this series here: https://wereboar.com … ignal-tracer-part-0/ )
I’ve decided to give this Eico 145 tracer a new lease on life and put it into service on my test bench - but to do so will require replacing the bad parts. Which ones? Pretty much all of the passives aren’t any good at this point. The device itself isn’t the cleanest example of it’s kind, with lots of battle scars. Paint and rust decorate the front panel and chassis, and input jacks have been added to the front.
The signs of use are the reasons I’m putting this on the bench. It’s already seen it’s share of use and won’t mind some more.
The chassis has the expected rust and age. That happens, there are no rust outs or severe damage here so I’m not worried about it.
The unit itself has some interesting things about it. There’s supposed to be a 10uF capacitor across this big 470Ω resistor. This is the cathode resistor for the audio output tube, and the capacitor is there to improve audio fidelity. I’m not sure if that was omitted because it’s not going to do much when most of your signal is 1Khz, or if it was damaged and removed at some point. The capacitor visible at the bottom is also an oddity, being an 800V part on the grid of a 6SJ7 - there’s nowhere near 800V present in this unit, and nowhere near B+ on this grid. Why this is such a high voltage part is a mystery but is probably just “That’s what I had on hand.”
The audio output transformer is somewhat of a mystery as well. I can’t tell if it’s been replaced or was just misdrilled. It doesn’t match the holes in the chassis, so I need to track down the part number and see what it was originally meant for.
Tape and wire and WTF indicate this thing had multiple repairs over the years. All of that needs to go.
Some more user friendly parts will be added to clean up the device and make it more accessible.
There are some other considerations to take into account. This device was originally meant to be ran on 110VAC - unlike our modern line voltages of 120 to 125VAC. This means B+ is hot, and filament voltage is well over 7VAC - in this case I measured 7.11VAC! That’s too hot, and will burn out the tubes in short order. Another restoration suggested a couple of parallel opposing diodes to drop the voltage in the filament line down, so there will probably be a couple 100V 2A diodes in this thing’s future. It was also suggested that the 6K6 is being run hot, so increasing the cathode resistor’s value (the large 470) would bring the power on the plate of this tube down.
Since most of the parts are being replaced, the analysis is just to make sure there aren’t any major problems that would stop the show - and I don’t see any. The next step is to create a new parts list from the schematic and get things ordered.
I’ll see you in part two with that schematic and a parts list.
Next part of this series: https://wereboar.com … ignal-tracer-part-2/
Previous part of this series: https://wereboar.com … ignal-tracer-part-0/
- 2024
- Mar
- 24
Pictures from the Scott Antique Market
The Scott Antique Market has closed for the season in Columbus, with the next show happening in November. There weren’t enough things to make a post for each of the past few months, so I’ve consolidated everything from this year into this one post.
The normal assortment of radios, televisions, and other electrical oddities showed up, with a number of just interesting or other neat things.
I did pick up one item that will be the subject of it’s own post, but until then - here are all of the things I found interesting from the last three shows.
