- 2024
- Dec
- 3
An Olson TE-189 C-R Analyzer - Considerations
I’m getting ready to replace some of the parts in this device, and I decided to take a look at what I’m doing and consider things.
I recently cleaned up an older B&K Capacitor Checker, and (in theory) this device should be a good reference instrument for measuring parts in this device. I decided to check things and it made me wonder if I really should replace all of them. There are some that will most certainly get a new part in their place, but others…
The first is the 400pF mica capacitor. I originally thought this thing was a mod, as it has a capacitor and a trimmer. However, I’ve seen another unit under rebuild and it has the same thing. The trimmer itself is plastic, so there’s no way this thing is approaching 600V, but it adjusted down perfectly and I had a good 400pF on the meter.
The big 4μF was similarly in good condition with this meter.
This one has good ESR and has a big 1k resistor to absorb the brunt of any voltage, so I think this and the 400pF will just be left alone for now. I have replacements in case they do need to go, but they don’t right now.
What does need to go is all of these metal can parts, especially the across the line capacitors and the filter. For the 40nF capacitor, I chose some 1% film parts at 630V and paralleled two of them for 40nF:
For the filter, two 10μF in series at 450V to make a 5μF at 900V. This part will probably get some heat shrink to strengthen the assembly. I chose this route because it was much cheaper than trying to find a part rated the appropriate voltage.
There are some resistors as well that seem out of tolerance, but those will need to wait. It’s not like this thing is going to be as accurate as a modern digital meter, but my concern was to prevent electrical problems.
The entire parts set to be replaced (save the 4μF):
1x 5μF filter capacitor assembly, electrolytic.
1x 40nF test capacitor assembly, film.
1x 0.01μF input blocking capacitor, film.
1x 1500pF capacitor for the eye, polystyrene.
2x 0.047μF across the line capacitors, safety film.
1x A1C neon bulb for the front panel.
Also, I am going to replace a poorly placed 1MΩ resistor across the eye tube, and perhaps the 1K and 500Ω resistors used in the test circuit (with the 500Ω just kind of hanging there in the air.) The latter two are both high-wattage parts (of unknown power) so a 10W part should be more than plenty on these.
That’s it for now - the next step is to put the parts in. That shouldn’t take long, but I’m also going to clean up some of the wiring as it’s in terrible shape. Stay tuned!
Next part of this series: Coming soon.
Previous part of this series: https://wereboar.com … some-notes-on-parts/
- 2024
- Dec
- 2
My 2025 Hamfest and Show List
As 2024 winds down, I find myself looking forward to the shows in 2025. I’m planning on going to most of the same ones, with perhaps a few new ones if time allows.
As of the date of posting, not all shows have updated their dates for 2025. Check back soon, I will post actual dates as soon as I know about them. Links to pictures will be posted here as soon as I’m done with them, and I’ll do a year-end wrap up as well.
Johnstown Swappers Day and the Scott Antique Market aren’t really hamfests, but enough electrical and other goodies show up that it’s worth going if you’re in to general flea market type items. I’ve added The Cincinatti Hamfest to the list this year, and I may still try to get to the Van Wert show and Kalamazoo show, all depending on how things go. Dayton, of course, is a will-go no matter what, and we may have a table this year.
Sunday Creek Amateur Radio Federation Hamfest
Shade Community Center
2380 Old U.S. 33
Shade, OH 45776
January 19
8A-Noonish
Admission $6
http://www.arrl.org/hamfests/sunday-creek-amateur-radio-federation-hamfest-4
Event photos: Coming soon.
Cuyahoga Falls Amateur Radio Club Hamfest
Emidio & Sons Party Center
48 E. Bath Road
Cuyahoga Falls, OH 44221
April 5
8A - 1PM
https://sites.google.com/cfarc.org/cfarc/hamfest
Event photos: Coming soon.
TUSCO ARC Hamfest
Commercial Building at the Tuscarawas County Fairgrounds
295 South Tuscarawas Ave
Dover, OH 44622
Usually late April
8A - 1PM
https://www.w8zx.net/hamfest
Event photos: Coming soon.
Dayton Hamvention
Greene County Fair and Expo Center - The Whole Thing
210 Fairground Road
Xenia, OH 45385
May 16 17 18
Hours vary by day, opens at 9AM
https://hamvention.org
We might have a table at this one for 2025.
Event photos: Coming soon.
Breezeshooters Hamfest
Butler, PA
Butler Farm Show (Kind of a fairgrounds thing)
625 Evans City Rd
Butler, PA 16001
Usually early June
8A - 2PM
https://breezeshooters.org/ns/
Event photos: Coming soon.
Columbus (OH) Hamfest
Aladdin Shrine Center
1801 Gateway Cir
Grove City, OH 43123
Usually the first weekend in August
8A - 1PMish
https://aladdinshrine.org/hamfest/ (website issues at time of posting)
We might have a table at this one, depending on what sells at Dayton.
Event photos: Coming soon.
Cincinatti Hamfest
Clermont County Fairgrounds
1000 Locust Street
Owensville, OH 45160
August 9
8A - 2P
https://cincinnatihamfest.org/
Event photos: Coming soon.
Johnstown Swapper’s Day
Johnstown Community Sportsmen’s Club
7357 Sportsman Club Rd NW
Johnstown, OH 43031
Labor Day Weekend (Fri Sat Sun)
7A - 6P
https://jcscohio.org/swappers-day/
Event photos: Coming soon.
Findlay Radio Club Hamfest
Hancock County Fairgrounds
1017 E. Sandusky St.
Findlay, Ohio 45839
September 7
8A - 1PM-ish
https://www.findlayradioclub.org/
Event photos: Coming soon.
The Cleveland Hamfest and Computer Show
Berea Fairgrounds, Eastland Entrance
160 Eastland Rd
Berea, OH 44107
Date TBA
8A - 12P
https://www.hac.org/
Event photos: Coming soon.
The Scioto Valley Amateur Radio Club Hamfest
Pike County Fairgrounds
311 Mill Street
Piketon, OH 45661
Date TBA
8A - 12P
https://www.arrl.org/hamfests/scioto-valley-amateur-radio-club-hamfest-2
Event photos: Coming soon
MARC Hamfest
Military Air Preservation Society Hanger (MAPS)
2620 International Parkway
Green, OH 44232
Date TBA
8A - 1P
http://w8np.net
Event photos: Coming soon
Fort Wayne Hamfest
Allen Country War Memorial Coliseum
4000 Parnell Ave
Fort Wayne, IN 46805
Usually the weekend before Thanksgiving
Hours vary by day, opens at 9AM
https://www.acarts.com/hfmain.htm
Event photos: Coming soon
Scott Antique Market November
Ohio Expo Center (State Fairgrounds)
717 E 17th Ave
Columbus, OH 43211
Usually Thanksgiving weekend
Hours vary by day, check before you go.
https://www.scottantiquemarket.com/
Event photos: Coming soon
Scott Antique Market December
Ohio Expo Center (State Fairgrounds)
717 E 17th Ave
Columbus, OH 43211
Usually the weekend before Christmas.
Hours vary by day, check before you go.
https://www.scottantiquemarket.com/
Event photos: Coming soon
Always check dates and times before going, and I’ll see you there!
- 2024
- Dec
- 1
Photos from the November 2024 Scott Antique Market.
This month’s show ended a few hour ago, and I made it out there on a very chilly, windy Saturday morning. For some reason, it opened later this year…some whispers about something that happened with the other show in Atlanta but I couldn’t pin it down. Doesn’t really matter, I guess, we entered about 8:45 and started wandering the not-quite-open aisles.
As usual, the place was packed with vendors and there was a lot to see. Not a whole lot I wanted to take home, but a radio that caught both my and my fellow show-goer’s eye decided to go home with me for a superb price. Check out that device, there will hopefully be a series of posts about making it sing again.
Here’s what we saw at the show:
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Next show is the weekend before Christmas. See you there!
- 2024
- Dec
- 1
The B&W Model 200 Signal Generator Part 3 - setting it aside for now.
In the last part, I determined that the tubes (save perhaps the 6×5) were not at fault in causing this device to act up. After I wrote that post, I sat down with it just a bit more and did some poking.
First thing was to put a good 10k power resistor in place of the one that rose to 160k when warm. No change in operation. Second was to give it a good look-over one more time.
I noticed that there was some goo coming out of the electrolytic in the oscillator section. That’s not good.
Ok, so that capacitor is probably bad. I measured the DC voltage on it.
There’s a really slow variation in the DC that matches the oscillator’s on-off cycle. I did some quick bypass with new caps, paralleling the presumed bad devices:
No change.
This thing has more problems than I originally assumed, and the lack of any information on the unit is hampering my ability to work with it.
For the time being, this goes back on the “needs work” shelf, as I already have a working generator and need to get some other devices fixed. If I can get to it before Hamvention, then I’ll take another look. Stay tuned!
Next part of this series: Coming sometime maybe.
Previous part of this series: https://wereboar.com … or-part-2-diagnosis/
- 2024
- Dec
- 1
An Unknown 2-dial TRF radio.
The Scott Antique Market happened this weekend, and much to our (and a lot of other people’s surprise!) it opened an hour later at 9AM. Remember what I said about checking hours? Well…guess what this stupid little pig didn’t do?
(Some update notes on this - it could be a regen unit as well, according to some. The little glass part marked “GLASTOR” may be a grid-leak resistor, aka GLASs resisTOR. And, there are no parts under the wooden plate. What you see is what you get!)
Anyway, there was some good stuff to see, but I didn’t really see anything I wanted to bring home until we were getting ready to head out. My show-going companion stopped by a big coffin set on a table. The guy had a price on it and I was going “That’s a good price for that piece.” I ended up buying a box of tubes he had beside it, but my buddy was stuck on the radio set itself. I looked, hmmm’d…do I have room for this thing. The guy said “If you want this, how about this other, lower price.” Buddy was just looking at me with puppy dog eyes saying get this dude. So I did.
It’s obviously a homebrew set. The empty hole doesn’t look like anything was ever in it.
Two tuning capacitors, a couple of rheostats, and an on-off switch adorn the front.
The cabinet itself is pretty good outside. A little scuff here and there and some paint splatter - but considering this thing is probably nearing 100 years old, it’s a solid external 7/10. Inside is very clean, and probably resembles the day it was built. There’s some cloth loss on the wiring, of course, but that’s acceptable and understandable. Some things will need to be tightened up - the escutcheon dials are loose - but nothing major.
Similarly, the rest of the case is in good condition. The varnish on the top is really the only bad spot on the unit.
As for the inside…it’s your standard TRF layout. Two tuning capacitors and a tuned inductor present themselves immediately. I’m not really that familiar with TRF sets, so I’m not going to go any further with that in trying to define what they all do. Four tubes, and two interstage Thordarson R200 transformers are really all that’s in this thing. I’m assuming there are some parts underneath the wood plate, but I have not dug that far into the unit.
I’m going to assume this needs +90, +22.5, +5, and +1.5, and that they went in the spot where the cables currently reside.
As for the tubes, all of them were present but wrapped in paper, so I don’t know where they go.
Tube compliment for this is 3x UX201A and 1UX200A. The 201’s are all RCA branded, and one has a Western Auto Supply price tag of $5.00 on it - that’s nearly $91 today! The final UX200A is unbranded on the base, but has a “Wizard” sticker on it. It’s also priced at $5.00 at Western Auto - so there’s nearly $400 in tubes in this thing!
The 200A dates this to at least 1926 and no earlier, as that device was introduced in May 1926. It’s possible the unit is older, but I can’t see someone discarding such an expensive tube just because a slightly better model was announced (although it’s possible.) Since superheterodyne was already a thing at the time, it’s probably not much newer than ‘26 as TRF was a rather poor (although easy) way of getting audio from the air.
The paper the tubes was wrapped in is a Columbus (Ohio) Dispatch from 1970, so the previous owner set it aside some 40 years after it was turned on. The paper itself is quite interesting - a story about how banks are cutting back on loans, a story about how federal payrolls are ballooning, and an ad for credit card fraud monitoring and restoration. You could almost change the date and reprint this thing!
Regardless, this was a great deal and I’m happy I brought it home. As stated earlier, TRF is really outside my knowledge range, so my next step is to grab a few early radio books that have TRF circuits in them. It’s quite likely that the original builder followed a schematic in a book or magazine, so finding something similar probably won’t be too difficult.
If you recognize the layout please let me know on Mastodon or LinkedIn, and stay tuned!
Next part of this series: Coming…sometime.