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#1
03-11-2006, 09:25 PM
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Old Oscilloscopes
Anyone here like old oscilloscopes? I was wandering through this used electronic parts store's yard today and found a really old one sitting in the rain, and I had to rescue it. "Dumont Cathode-Ray Oscillograph" model 274, it uses the 5BP1-A crt. It looks at least 1940s. It uses two #80 tubes, I don't know when they stopped using those old tube designations, but I thought it was sometime in the 30s. Despite being out in the rain it is actually clean inside, but it uses some capacitors for which locating replacements would be nearly impossible: 5mfd at 1500volts and such. I don't really need another working one anyway, I might just put this ontop of a TV and look at it.
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#3
03-12-2006, 04:11 AM
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I Like my Oszi, but i do not no anything about .... looking for Manual for this mine  Helge
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"Iss dein Schitzel, sonst kriegst du keinen Nachtisch“ Elliot Reid 
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#5
03-20-2006, 06:47 AM
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#6
09-24-2006, 07:39 PM
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RE: Oscilloscopes
I have a Philips PM3226 Dual Trace w/Power Cord, 1 set of probes plus Coax and fittings on the way to me for $48 (hope it works)
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#7
03-12-2006, 08:13 PM
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I had a DuMont that looked like it came off the ark; sold it for about $3 at the ETF convention last year. I got rid of most of my old scopes as they were just taking up space-right now I have an EICO, I think there is still a Bell+Howell school scope somewhere hiding, plus a little RCA from the early 70s that I keep on the bench. I'm no good with them-yet. I do have one other, which I need to keep. It's an RCA, pretty early, which was resprayed with silver paint. Under the paint you can read the old lettering-"NBC TV, Washington". Like all the others, it works at least to the point of putting light on the screen.
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Bryan
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#8
03-12-2006, 09:01 PM
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I have a Tek 535, an early production one from about 1955. I had intended to restore it slowly as I had time. It worked when I got it, after a little recapping, it works perfectly. Since it got here, I havent used anything else. The "modern" scopes are gathering dust now...
John
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#9
09-26-2006, 12:32 AM
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I had one of these about 11 years ago, but I gave it away. Posted a notice on a usenews newsgroup "free Tek 535 scope with a ton of plug ins, come get it out of here. First email claims it." I was happy to gain a few cubic yards of space, the guy who came was happy to get it.  BTW, I found that i still have a "Type 80 Vertical plug in". Somewhat incomplete, and the external probe I don't have. Anyone want it (cost of postage gets it)? You could build something custom to fit your scope with it. I have a modern 400Mhz Tek scope when I need to look at a waveform.
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#10
03-12-2006, 11:13 PM
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I have two 535's one early and one late production. The late one is operational but the early one had one of the wafer switches burn up. It does work but the trigger is now fixed. I got the early one when I was in high school in 1977 so I will keep it maybe some day I will find a parts unit. They are handy in winter to use as space heaters. Tube scopes can be handy when working on high voltage devices, the input stage tubes can take a boo boo better soild state scopes. I've had to repair a few front ends on soild state scopes so I have a few small tube scopes to use if I'm working on something that might spike my good scopes.
Steve
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#11
03-13-2006, 03:56 AM
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I have this Philips PM3230 tube scope. I got two of them from a local school, none of them working properly. One of them looked very good, and the other was dirty and worn. I got the clean one to work and kept some parts (tubes) from the other one. It har 7 tubes plus the true-dualbeam CRT. It works perfectly and looks pretty good too - a nice piece of equipment. I have not replaced any components yet. I tested some random caps, and they tested good, so i left them in.
Last edited by larschr; 03-13-2009 at 08:53 AM.
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#12
03-13-2006, 08:55 AM
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I have a Tek 545(A?) -- I can't find a picture of it at the moment :-(
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all the best, mrh
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#13
03-13-2006, 09:35 AM
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I've got an RCA Cathode Ray Oscillograph (!) from 1935-uses a 1" metal CRT, & a Waterman Pocketscope from right after the war. Neither works, they light up, but that's about it..Would like to get 'em both geein' & hawin' again...-Sandy G.
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Benevolent Despot
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#14
03-13-2006, 12:49 PM
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I haven't kept anything that didn't have a triggered sweep, having worked with MANY scopes that didn't. I'm STILL sick of Lissajous patterns, even though they can be extremely accurate on matching frequency and phase.
I have had intimate introductions to the HV on some of those older scopes..... That said, even though the trace isn't as sharp as some of the older scopes, the Tek 464,466 storage scope traces are sharp, and the 465's and 475's have a passable trace.I also have had the HP 17xx scopes, keeping a 1726 currently.
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 Nothing is ever completely fool proof, because fools are so ingenious.
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