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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. Feel free to add to this thread with your most ancient grizzly piece of test gear. Valves, tunnel diodes and ancient woodworm ridden casings welcome. Special credit for home built stuff, especially if pre-Intel.
I have a Robin pocket multimeter here, it still works (!) once recalibrated. It appears one of the diodes drifted but other than that all works fine. A few scratches and dings but once the cover was Liquid Poly'd back together it looked fine.
Also have an antique grid dip meter using a valve. This is older than I am (!) and amazingly even though it has been butchered by its previous owner it still works.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I've been repairing this one for a while. Few things are older then General Radio and Boonton.
This is a General Radio 1233-A power amplifer. Audio and HF frequency amplifier, full power output is roughly 25W. Full tear-down of old capacitors and hardware, basically gutted. I decided to get the input stage differential amplifier working again today because out of all the things I could do today, most of them required going outside and its 104F right now, so why bother.
It has two sets of output transformers to handle the two frequency ranges, and the drivers are 807's, very reliable tube.
It doesn't work, though. I have a new one. It was my first ever piece of equipment, I got it when I was 10 years old, my dad's old meter. I think it was what got me into electronics. :D I used to make coin batteries and test them. I loved this meter. I lost it in early 7th grade, and tore up the house looking for it twice. At the second time, I told myself I'd find it when I moved, and June 8, when we moved, I found it. Well... my mom did. I was very happy, but I already had a new meter with many more functions. :P I also have had an ancient oscilloscope since I was 9. My dad told me then: One day, you'll love electronics, and you will want it. Oh how right he was. It doesn't work right though, and it's an old analog one. I have no idea how old it was at first though.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Well, I didn't feel like filling a page with images so links instead. I do not own this anymore, I donated it to the geek group to have it in their museum when it's built, personally delivered. This old meter doesn't work because when I turned the switch it seriously busted into a thousand parts. It was horribly fragile. I got it for 20 bucks. Enjoy..
It came with origional manual and test leads as well.
Two batteries powered this.
And a 10 cent battery
Made by acme ( not to be confused with cartoons acme ) dated 1944 best used by :)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Heh.. Really must post picture of the guts, despite its age this meter is fully working. I am amazed that all it needed was its offset resistor adjusting, for some reason it drifted a quarter turn in one direction.
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