60's oscilloscope find - Page 1
Forum section: electronics / testgear

author: Sparks
author_rank: Contributor
timestamp: August 15, 2015, 05:36:04 pm
content: Last week I was at a local art/second hand store. As a guy was unloading furniture from his truck, I noticed an old metal box which he had moved aside. Just had to check it out, its a 1960's oscilloscope. Heathkit 10-12, got it from him for $10. First things first. Before you turn it on...yeahhh. The crt looks as if someone had tried to twist it out like a light bulb. Some of the wires need replaced and...vacuum tube tech, nice. Pics to follow.

author: Capt. Apparatus
author_rank: Newbie
timestamp: August 15, 2015, 06:53:32 pm
content: Can't wait to see it Sparks!I've got an old 50's Eico O-scope in my backlog that I need to get around to refurbishing sometime sooner than later.

author: Sparks
author_rank: Contributor
timestamp: August 15, 2015, 07:37:51 pm
content: Problem with my tablet, I can only load one pic at a time.

author: Capt. Apparatus
author_rank: Newbie
timestamp: August 15, 2015, 10:09:14 pm
content: Now that's what I call a patinaWhen you go searching for Manuals and service info be sure to look up IO-12, 10-12 seems to be a common mistake on the model number from what I understand.http://www.radiomuseum.org/r/heath_laboratory_oscilloscope_i.htmlschematic can be found herehttp://www.vintage-radio.info/heathkit/

author: Sparks
author_rank: Contributor
timestamp: August 15, 2015, 10:59:53 pm
content: Thank you Capt. I was mistaking that for a 10. I'm finding a lot more information on it now. The gentleman I bought it from says his dad had brought it home from the shipyard where he worked as a nuclear tech.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: August 16, 2015, 01:10:27 am
content: Looks like the CRT has actually been twisted out of its base&pins. You've really got your work cut out for you on that one.Not only will you have to deal with that, but also all those old capacitors... and it was probably put together from a kit by someone who may not have had the necessary skillset in the first place...Maybe the seller will take it back, in trade for a velvet painting of Elvis or something.Here's my "doorstop" project .... it actually lights up and produces a trace, or at least it did the last time I tried it, eleven years ago....

author: VintageNut
author_rank: Frequent Contributor
timestamp: August 16, 2015, 01:23:35 am
content: I had an O-5 way back in the day.I built an IO-4205 transistorized model in 1980/81

author: nidlaX
author_rank: Frequent Contributor
timestamp: August 16, 2015, 01:46:03 am
content: Quote from: Sparks on August 15, 2015, 10:59:53 pmCan you say asbestos contamination?

author: bills
author_rank: Frequent Contributor
timestamp: August 16, 2015, 01:58:30 am
content: The crt should be a easy find, what is the number?I have several o-scopes from the 50's-90's.Just no DSO's, I do have a tec storage scope 1990's

author: Sparks
author_rank: Contributor
timestamp: August 16, 2015, 06:06:49 am
content: Well, managed to work on the cat tonight. Pulled the base out of the socket and removed the solder from the terminals. It's a Rayonic 5UP1, luckily found a pin diagram on the Web. Ten wires with 12 terminals, simple enough. Cleaned up the wires a bit then soldered on some 30 gauge wrapping wires to pull them through the terminals. Solder the wires back on and clip the excess, simple fix if the tube works. Could be a reason someone tried to remove it. Well, 2 am and I work in the morning, that's it for the night.

author: Capt. Apparatus
author_rank: Newbie
timestamp: August 16, 2015, 05:23:21 pm
content: I agree on the capacitors, at the very least you should replace any 'lytics you see before you try firing it up. The old oil high voltage types, if there are any in that scope, tend to be A-ok if you don't see any physical leakage in my experience. Then of course you've got the crusty old wax/paper/foil caps as well, quite the project indeed!Also a quick and dirty way to check the CRT for anything show stopping is to use your meter to check continuity on the filament pins and to check the other pins for any shorts.

author: Sparks
author_rank: Contributor
timestamp: August 16, 2015, 06:19:47 pm
content: Checked the filaments on the crt and all vacuum tubes before doing anything. My dad grew up in the 50's and used to fix old junk tv sets for extra cash. He was a little interested in how I'm checking the tubes without a drug store tester.

author: bills
author_rank: Frequent Contributor
timestamp: August 16, 2015, 06:46:23 pm
content: If you need any tube for it let me know I have quite a few.Also a tube tester or 3