Went to use my good old Tektronix 2335. Chanel A is dead. Reads about 100th and fades. Any ideas, or is it just time to find another?
Looking on e-bay, guess the answer is another. Gad, what these things cost new, and now go for $60. 465's still get money, but it was probably the greatest scope made. I spend years staring at one for a living.
I got a 2335 at a flea market deep in Amish country for $20. The seller did not know what it was. Of course it did not work.
Autopsy revealed a blown fuse in the power supply. I don't remember all the details since it was about 5 years ago, but there were several dead part in it. I think that there was a dead diode, and a dead transistor, and two shorted caps which caused the dead silicon. There might have been more dead stuff. I never found a service manual or schematic for it, so I just kept poking around looking for voltages that didn't make sense. It has worked fine ever since i fixed it, but it doesn't see much use. It is the only true analog scope that I have, and the only one that works correctly with a Vacutrace curve tracer.
Mine came with a 2336 manual. The manual was "printed in U.S.A." but the trademark notice on the same page says "trademark of Tektronix U.K. Limited."
The picture of the rear of the scope in the manual shows "TEKTRONIX INC, BEAVERTON OREGON, U.S.A." The back of my scope says "TEKTRONIX GUERNSEY LTD. C.I." This would imply that this scope might have been made on both sides of the pond.
Tek would later marked the UK scopes as "Telequipment" scopes in the US. We quit using Telequipment at Motorola in a production environment for reliability and cost reasons. We switched to Hitachis since a similar scope with a larger screen was under $400. The Hitachis never died either.
Autopsy revealed a blown fuse in the power supply. I don't remember all the details since it was about 5 years ago, but there were several dead part in it. I think that there was a dead diode, and a dead transistor, and two shorted caps which caused the dead silicon. There might have been more dead stuff. I never found a service manual or schematic for it, so I just kept poking around looking for voltages that didn't make sense. It has worked fine ever since i fixed it, but it doesn't see much use. It is the only true analog scope that I have, and the only one that works correctly with a Vacutrace curve tracer.
Mine came with a 2336 manual. The manual was "printed in U.S.A." but the trademark notice on the same page says "trademark of Tektronix U.K. Limited."
The picture of the rear of the scope in the manual shows "TEKTRONIX INC, BEAVERTON OREGON, U.S.A." The back of my scope says "TEKTRONIX GUERNSEY LTD. C.I." This would imply that this scope might have been made on both sides of the pond.
Tek would later marked the UK scopes as "Telequipment" scopes in the US. We quit using Telequipment at Motorola in a production environment for reliability and cost reasons. We switched to Hitachis since a similar scope with a larger screen was under $400. The Hitachis never died either.
Leaning to a Rigol. 100 M, storage. They seem to have the better rep as one step above the cheapest. Going to so quite a bit of googleing first. We never had a Hitachi when I was in the lab, just some HP which I hated and some Phillips, that were IMHO, junk. 7800 series and 7900 mainframes were SOP.
Is channel B and the rest working? Giving any thought to fixing? Download source: https://download.tek.com/manual/2235_sm.pdf
Good luck!
Good luck!
I have a Rigol DS2072A scope and a DSA832E RF spectrum analyzer. Both are good products. I got the scope nearly 10 years ago when there were details on the web as to how to reprogram it into the top of the line model. Don't know if this is still possible. Edit, maybe it still is:
2017 Rigol DS2072A Unlock and other questions - Page 1
About this time of the year Rigol runs clearance sales on reconditioned, or demo products. I got the spectrum analyzer three years ago on such a sale for about 60% of list price.
HP makes good test equipment. Their scopes, especially the older ones suck and are nearly unrepairable. Tek makes good scopes, some of their other test equipment, not so good. I got one Philips scope in a lot of used test equipment. It did not work, and once I opened it, I decided it would stay that way. I sold it at a hamfest as a parts unit.
2017 Rigol DS2072A Unlock and other questions - Page 1
About this time of the year Rigol runs clearance sales on reconditioned, or demo products. I got the spectrum analyzer three years ago on such a sale for about 60% of list price.
HP makes good test equipment. Their scopes, especially the older ones suck and are nearly unrepairable. Tek makes good scopes, some of their other test equipment, not so good. I got one Philips scope in a lot of used test equipment. It did not work, and once I opened it, I decided it would stay that way. I sold it at a hamfest as a parts unit.
I hated the triggering filters of the old HPs, but the 1610 and 1615 analyzers were my bread and butter. Worst HP product was their bench meters as they glitched. I asked the engineer one time and they said, 'Why did yo buy an HP meter? Everyone buys Fluke. We only make them because some companies order sole source"
I don't see much love for the newer low end Tek scopes. Seems they can't compete low end.
The other time I got them was when the intro team (lead designers) toured the, I think 1630? and they bragged about their disassemblers. So I asked, "where is the Z80 and Z800?" They looked puzzled. " Who uses them?" My response was our entire next generation products. In HP fashion, they had them in about 3 weeks! We bought several.
I was a lab rat in the 70's and 80's, so I knew the old stuff very well. Why I don't fix mine? Too many projects, not enough time. I wonder of parts are available. I would suspect the front end is some obsolete Motorolloa RF FET? Yes, Q13 if I were to bet. Thanks for the manual though.
I may just toss all my electronic projects. No longer my main hobby. I am only doing a few more speakers as I can't buy what I want and tweaking a few filters as again, I can't buy them. I can get by re-capping and tweaking the power supplied in my old MOSFET amp and Nak 5 preamp with a meter. I was working on piggyback high energy ignition boxes for Lucas ignitions, but never going to get back to that.
I don't see much love for the newer low end Tek scopes. Seems they can't compete low end.
The other time I got them was when the intro team (lead designers) toured the, I think 1630? and they bragged about their disassemblers. So I asked, "where is the Z80 and Z800?" They looked puzzled. " Who uses them?" My response was our entire next generation products. In HP fashion, they had them in about 3 weeks! We bought several.
I was a lab rat in the 70's and 80's, so I knew the old stuff very well. Why I don't fix mine? Too many projects, not enough time. I wonder of parts are available. I would suspect the front end is some obsolete Motorolloa RF FET? Yes, Q13 if I were to bet. Thanks for the manual though.
I may just toss all my electronic projects. No longer my main hobby. I am only doing a few more speakers as I can't buy what I want and tweaking a few filters as again, I can't buy them. I can get by re-capping and tweaking the power supplied in my old MOSFET amp and Nak 5 preamp with a meter. I was working on piggyback high energy ignition boxes for Lucas ignitions, but never going to get back to that.