Tek 465 or tek 2225 around 100€ - Page 1
Forum section: electronics / testgear

author: DarKnightSP
author_rank: Newbie
timestamp: November 14, 2018, 04:46:25 pm
content: Hi everybody,I was going to buy a second hand tektronix 2225 for around 100€, I have proof that it works well because the owner has sent me some videos testing the calibrations signal on the scope. I was ready to buy it but today a 465 for the same price appeared. So I don't know which to choose.The 2225 is 50Mhz vs the 100Mhz of the 465 but also the 2225 is a newer version and I have proof that it works well. Both came with probes and the 465 also with a bunch of accessories that I can't distinguish in the photo.

author: bd139
author_rank: Super Contributor
timestamp: November 14, 2018, 06:17:59 pm
content: I’d take the 465. It’s a 465b.Currently have two of them. And had a 2225. The 2225 has some parts which are totally unobtainable if it goes wrong.

author: grbk
author_rank: Contributor
timestamp: November 14, 2018, 07:47:01 pm
content: What's your intended usage? The 2225 obviously has half the bandwidth, but it does have a x10 vertical mag (down to 500uV/div) that's quite useful in some situations. It's also ~10 years newer if I'm not mistaken.Looks like you get some nice original probe accessories with the 465, in addition to the probes and BNC cables. Not sure how important that is for you. The hardcopy manual is always nice to have, although softcopies are readily available online.I've never had a 465(b), but people do seem to love them.I do have a 2225 and like it a lot. I wish I had a hardcopy manual.I don't think you'll go wrong with either.

author: DarKnightSP
author_rank: Newbie
timestamp: November 14, 2018, 08:16:22 pm
content: Quote from: bd139 on November 14, 2018, 06:17:59 pmIt's newer but the parts are more hard to find? How can it be?Quote from: grbk on November 14, 2018, 07:47:01 pmThat's the point. I don't know if I will need more bandwidth or more sensitivity. I have seen this video that uses the rear output of the 465b to amplify the signal to increase the sensitivity but I don't know if that is the intended use of that output.I'm starting with electronics, that's why I don't know which will be better for me. One think I would like to do is test power supplies noise, for example

author: bd139
author_rank: Super Contributor
timestamp: November 14, 2018, 11:11:11 pm
content: Quote from: DarKnightSP on November 14, 2018, 08:16:22 pmSurprisingly difficult. The main failure points on these are the intensity pot, the front panel switches and pots and the flyback transformer. None of these parts are available anywhere now other than working scopes and working 2225's go for a lot of money usually (at least here in Europe).Conversely there are Tektronix 465/475 scopes available in large quantities, dead and alive, sometimes available for very little money and they take very little to ressurect. If you search around the forum you'll see how many have been fixed (quite a few threads by me on this).... also lots of us have parts mules and will share parts.The killer is both of these scopes are old by any standard so they are prone to failure at this point so you have to hedge your bets a bit and pick the easiest to fix item IMHO.However to note, I paid less than €100 for my TDS210 so it might be worth looking around still for a bit longer.On the bandwidth vs sensitivity, I've never needed a scope with 500uV. Also the 2225's 500uV is extremely dependent on how good the capacitors are in the power supply.Ultimate for me, which I just got my hands on for ~ €80 was a Tektronix 475A with DM44 so that's 250MHz bandwidth, 500uV and a DMM built in. I would still shop around.

author: vk6zgo
author_rank: Super Contributor
timestamp: November 15, 2018, 01:30:03 am
content: The 465 has dual time bases, the 2225 has not.The ability to display part of a signal, using one time base delayed by the other, is a facility that you will find yourself using more & more as you gain experience with Oscilloscopes.I remember "sweating blood" trying to learn how to use the dual time base with a 545b, but the later 'scopes like the 465 make it much easier to do.Personally, I have a 7613 with plugins, which offers another level of versatility, at the cost of being large.It cost me $A135 at a Hamfest some years backTalking of Hamfests-----if you haven't been to one, take a look next time one is on near you.Warning! If you are not already an Amateur Radio Operator, you might just get "converted",so your budgetwill be somewhat stretched to accommodate test gear & radio equipment, too!

author: 0culus
author_rank: Super Contributor
timestamp: November 15, 2018, 02:46:04 am
content: Personally I'd get the 465B if I had to choose between those two. As others have noted, it doesn't have the oddball unobtainium parts that the other one has.

author: james_s
author_rank: Super Contributor
timestamp: November 15, 2018, 04:57:30 am
content: I would also choose the 465B, I have one and it's a lovely instrument. They're well known for being very reliable with very few custom parts. The 2225 is not a bad scope either but newer doesn't always mean better. It was a much lower cost scope than the 465B. IIRC the 2225 was around half the price even if you don't adjust for inflation.

author: bd139
author_rank: Super Contributor
timestamp: November 15, 2018, 07:41:58 am
content: 465b when it came out cost about the same as a small car.

author: David Hess
author_rank: Super Contributor
timestamp: November 21, 2018, 03:05:24 am
content: Less than 10 years separate the 465B from the 2225. Both contain custom parts. The 465B uses a linear power supply which is easier to maintain than the switching power supply in the 2225.2225 - 500uV/div at 5MHz, Single Timebase with Alternate Magnification (1)465B - 5mV/div at 20/100MHz, Alternate Dual TimebaseFor general use including linear and switching power supplies I would consider both acceptable but the 20MHz bandwidth limit of the 465B is more typically for noise measurements.(1) On the 2225, the vertical x10 multiplier also acts as the 5MHz bandwidth limit. This makes sense because displayed noise at 500uV/div would make 20MHz objectionable.

author: bd139
author_rank: Super Contributor
timestamp: November 21, 2018, 07:48:27 am
content: Quote from: David Hess on November 21, 2018, 03:05:24 amI would agree there. The 2225 power supply is a bit of a dick. (not as much as the 2235, one of which exploded on me yesterday)

author: David Hess
author_rank: Super Contributor
timestamp: November 21, 2018, 04:45:16 pm
content: Quote from: bd139 on November 21, 2018, 07:48:27 amThe 2225 switching power supply is easier and safer to work on than most off-line switching power supplies however because line isolation is provided by a 60Hz power transformer at its input so the usual line isolation requirements are already met.The 2235 design seems to have some mysterious failure modes. None of mine have failed so I have had nothing to investigate yet.

author: rauldm
author_rank: Regular Contributor
timestamp: March 30, 2022, 11:51:05 pm
content: I read about Tek 465 it has better display than 22xx series, is right? I want a analog scope for waveform reference, I have some digitals with DPO technology and is different on modulation signals in each scope model, Tek 465 is noisy? is more bigger than 2225?

author: David Hess
author_rank: Super Contributor
timestamp: March 31, 2022, 07:48:18 pm
content: Quote from: rauldm on March 30, 2022, 11:51:05 pmThe CRTs for the 465 and 22xx series are almost identical and perform identically.The 2225 will be a little less noisy because it is 50 MHz instead of 100 MHz.

author: trackersoft
author_rank: Contributor
timestamp: March 31, 2022, 08:49:03 pm
content: I have a 465b and a 2235 and use them both - I find the 465b a better scope. I have had them for years (picked each up at hamfests) and not had a problem with either. I also have quite a few DSO's and still find the old analog scopes useful although lately I find myself using the DSO's more and more. Since i bought them cheap, I find that i don't mind poking around boatanchors with high voltages where I would have to think twice using a newer and way more expensive DSO in that situation.

author: rauldm
author_rank: Regular Contributor
timestamp: April 01, 2022, 03:57:38 am
content: Quote from: David Hess on March 31, 2022, 07:48:18 pmThanks for your answer, I wrote bad my sentence, 465 it has fan is loud?

author: rauldm
author_rank: Regular Contributor
timestamp: April 01, 2022, 04:01:33 am
content: Quote from: trackersoft on March 31, 2022, 08:49:03 pmI had a 2247a, is good scope even with measures, but is it to big and loud, I change for a TDS3000 digital scope that emulating phosphorus technology, but I want now some little and not loud only for waveform reference, for view a true waveform without digital processing

author: David Hess
author_rank: Super Contributor
timestamp: April 01, 2022, 05:38:01 pm
content: Quote from: trackersoft on March 31, 2022, 08:49:03 pmMy 2232s and 2230s, which in analog mode are the same as a 2235, have a better display than my 465B, but the 465B is older and may have more hours on its CRT.Quote from: rauldm on April 01, 2022, 03:57:38 amQuote from: rauldm on April 01, 2022, 04:01:33 amThe fans in my 2230s and 2232s are practically silent. The fan in my 465B is practically silent. The fan in my 2247A is audible but pretty quiet.

author: rauldm
author_rank: Regular Contributor
timestamp: April 02, 2022, 03:38:30 am
content: I think I must go for 2225 for small size and fanless design, 465 in my country is more expensive, I like it for readout pin function.

author: Chris56000
author_rank: Frequent Contributor
timestamp: April 11, 2022, 03:29:00 pm
content: Hi!If you buy a 465B beware – all the PDF manuals I can find are missing Diagrams 4, 6, 9 and 10 as well as the Waveforms and Components Tables associated with these, and whilst there is a file "465B Missing Pages" on k04BB, this file is still missing Diagram 4!Post if you get a '465B and I'll upload scans of these missing sheets!Chris Williams

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: April 11, 2022, 11:33:36 pm
content: If you want to see square waves at 20 MHz the 465 is better because of the 100 MHz bandwidth.Mine has a VERY quiet fan

author: H713
author_rank: Regular Contributor
timestamp: April 12, 2022, 09:05:23 pm
content: I'd probably go for whichever is in better condition, TBH. I'd rather have a mint 465 than a mint 2225, but I'd also rather have a mint 2225 than a 465 with a high-hour CRT.Keep in mind, some of these scopes have EXTREMELY high hours on them, and trying to view fast signals with a tired CRT isn't much fun.

author: cdev
author_rank: Super Contributor
timestamp: April 14, 2022, 09:05:38 pm
content: Quote from: grbk on November 14, 2018, 07:47:01 pmThe 500 uv/div is nice to have.. It lets you use the better probe 10x setting more. To get the full BW its important to use the 10x probe.