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Old 27th Mar 2011, 9:31 am   #21
davidw
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Default Re: TEK scope excitement dashed

Very sad Chris. I found this..don't know if its anything like yours..http://www.surplus-electronics.co.uk...ucts/6364/5983
An email to these people may help. Good luck.
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Old 27th Mar 2011, 9:48 am   #22
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Default Re: TEK scope excitement dashed

Sadly not but I appreciate yours and other efforts, I will email them though you never know.
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Old 27th Mar 2011, 12:39 pm   #23
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Default Re: TEK scope excitement dashed

Hello, a useful site for Tek info is

http://www.reprise.com/host/tektronix/home/default.asp

But it didn't recognise the 2205, and searching for the 0929 part never completed, no idea why.

CRTs are pretty adaptable, looks like a standard 10x8cm tube, side contacts to X and Y? Must be many CRTs that would work in the 2205, biggest problem is actually physically fitting. What about the Gould OS300? Loads around for not much, I only get about £30 for a working one.

Get the circuit and find out the various electrode voltages, then do a similar search on other cheap scopes in ebay.

Bob
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Old 27th Mar 2011, 1:13 pm   #24
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Default Re: TEK scope excitement dashed

I seem to have collected a lot of information over the years about scope tubes, primarily so that I can identify an alternative when I have to replace one. So this might be helpful to you. I will search my info if you can give me some key data about your tube:
Dimensions: length overall, screen dimensions, neck diameter.
Operating voltages. From the circuit, work out the operating voltages of the various anodes and shielding electrodes.
Deflection: side or base connections? Voltage needed for full screen deflection. You can guestimate this from looking at the final stage of the X and Y amplifiers, and reckon it will swing from ground to HT. Better if you know the operating current, collector load and mid point voltage, and calculate from that. Remember that X amplifier often allows for the x5 expansion.
PDA: is it helical (dark spiral from screen around the bell down to the neck area), or mesh (single dark band near the screen front, and look at the manual. In particular, does the manual talk of a (flat) mesh tube, or a domed mesh. If domed, there will be scan magnification, and you will probably be stuck, as they are expensive and specialist. If original 1960 style pda, with one or two dark rings around the bell, and perhaps two pda connectors, one near the screen, and one half way down the bell.
I'll look up my manual sometime and see what I can guess if you give the exact model number. The various 22xx models will use different tube types depending upon the performance required. But Tek made there own tubes normally, so an immediate alternative is unlikely. But there may well be one that will make the scope usable. Bill
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Old 27th Mar 2011, 2:20 pm   #25
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Default Re: TEK scope excitement dashed

Bill,

From what I have found from various sources Part number of the scope is 154-0929-00 (Standard/P31) but it seems only used in the 2205, if this is correct or not I cannot confirm as of yet. I have many feelies put out and shall see if any bare fruit.

I shall try and find out some of the information you detail.

The cathode tube is 80x100mm and approx 340mm in length

Thanks for taking the time to make suggestions.

Regards
Chris
Attached Files
File Type: pdf 2205a.pdf (168.4 KB, 384 views)
File Type: pdf 2205b.pdf (391.8 KB, 318 views)
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Old 28th Mar 2011, 8:20 am   #26
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Default Re: TEK scope excitement dashed

That sucks !!!

Sorry to hear about the CRT being destroyed, that is the first EVER case of such a disaster, in a Tek scope of all things !!

Like the other gentlemen here have stated, purchasing a replacement o-scope is probably your best bet. The 2205 is a good scope, and I'd hang onto that one for a parts set.

At the same time, file a damage claim, chances are very good that you'll get some of your $$$ back ! The packing company/seller should re-imburse you to some degree due to the extensive damage.

Lots of scopes are out there that will fit the bill as far as a general-purpose scope, so I don't think you'll have much trouble finding another.

Best of luck !

Tom
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Old 29th Mar 2011, 4:40 pm   #27
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Arrow Re: TEK scope -- 2205 tube

I have rather enjoyed researching this. Best solution is to buy another scope using a similar tube. Now the tube is very uncritical. 10x8 cm, 335 mm long, all connections to base, mono accelerator (=no pda), 2kv final anode, and X and Y senstivity around 23 and 14 v/cm.
Now the constructive bit, the tube is Mullard D14-250. Tektronix had apparently decided to start using commercial tubes instead of making their own as they had done for 20 years or so. And in the mid 1980's the tube manufacturers were looking for any extra business, and Philips seem to have been very active. They supplied tubes with different type numbers to denote a different base connections (eg DH7-78 = Etel/Cossor 3BLP31). Or they made to special order, and used a contract type number.
The same tube or contract variants was used in the Telequipment D1010/1011, and D1015/1016 models, and the Advance OS255, OS300. Not OS250.
The various number appear to be: 1978-1985 dates
Tek 154- Mullard/Philips phosphor
0826-00 D14-250GH (=P31)
0826-02 58610GY (?P31)
0826-03 D14-250 GY (=GM,P7)
0854-00 58619GY/97 (?P7)
Advance
for OS255 D14-250 (?P31)
for OS300 D14-250 or alternatives:
44932 56825GY (=P31) but check base connections
44933 56825GM (=P7) on these, as it is
453575 56840GM/91 (=P31) they are using pins
452926 56840GY/93 (P7) marked internal connections.
The D14-250 also appeared as D14-251 and D14-252 with quick start heater or low heater current. Otherwise identical.
The alternative are as stated in various copies of the service manuals or parts lists, so could be subject to misprints.
The Hameg 203 uses a Philips/Siemens D14-364, the Beckman/Radiospares 7020 uses a Toshiba 150BT-B31.
Other tube types are: Mullard D14-360,-361,-362, TFK D14-621. All should do perfectly well, as these are commodity tubes for low end and now digital scopes. But check the base connections before you strip it out.
Brimar and GEC/MOV by then only made tubes with a spiral or mesh pda. So if looking for a low end scope to strip, ignore it if it has a pda tube. Look for the connector to the front of the bell. Good luck with your rummaging. Bill
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Old 29th Mar 2011, 5:16 pm   #28
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Default Re: TEK scope excitement dashed

Does anyone have technical information on Toshiba CRTs? I have a surplus & untested one from a Gould 1604, d/code 8839 type # 5K2
If it can be used then I will happily donate it, just arrange collection with me by PM.

Phil
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Old 29th Mar 2011, 5:57 pm   #29
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Default Re: TEK scope excitement dashed

Thanks for the info Bill that's certainly opened up the possibilities.

I have a Telequipment D1011 that was my scope before I decided to treat myself to a TEK for my birthday, yep great birthday!

I'm loathed to go pulling the D1011 apart and end up with nothing. Oscilloscope repairs are alien to me, TV's are my passion and i'm used to seeing CRT with the final anode on the side. This TEK CRT does not, so I'm guessing EHT comes in via one of the base pins?

Chris

p.s half of the companies contacted have responded most stated no hope, one said they were out of stock and would let me know if one came in, all UK based as yet no response from TEK and a few other still outstanding.

Chris

Last edited by oldticktock; 29th Mar 2011 at 6:03 pm.
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Old 31st Mar 2011, 11:37 pm   #30
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Default Re: TEK scope excitement dashed

Was just browsing ebay and happened upon this, maybe it could be of use?

http://cgi.ebay.co.uk/TekTronix-434-...#ht_500wt_1156

Dave.
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Old 2nd Apr 2011, 11:46 am   #31
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Default Re: TEK scope -- 2205 tube

re Davegsm82 of 31 March.. I fear the tube from a Tek434 will be completely un-useable in this context, as it is an analogue storage tube, and so will have completely different voltages, different base and connections and a pda on probably 7kv or so.
re Oldticktock of 29March. I attach a note of the base connections for the two families of tubes : D14-250 or 58610 and 56825 series of contract tubes. I would have thought it worth while to try out the tube from your D1011 in the Tek2205 to confirm that the rest of it works, so that you will feel it worth while searching for a replacement tube. It appears that it is a direct plug in replacement. Though do check the connections used between the two scopes. If you go looking for an Advance OS255/300 (they are very common on ebay) then check the differences between the tube connections. On my diagrams, they may just be different designations of internal connections (IC) and so interchangeable, but check with an ohm-meter. However the different X and final anode A1,3 will mean a bit of rewiring on the tube base. Bill m0wpn
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File Type: pdf D14-250 basing.pdf (36.8 KB, 411 views)
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Old 2nd Apr 2011, 1:58 pm   #32
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Default Re: TEK scope excitement dashed

Hi Bill,

I've had the D1011 open and the CRT is a Mullard P31-D14-250-GH. I found the schematic and that shows the pin outs. Main trouble is it looks like a major disassembly to remove the CRT and I have not figured out it removes yet. Thanks for all your guidance it has been appreciated, certainly has provided me with some options.

Kind Regards

Chris
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Old 2nd Apr 2011, 3:23 pm   #33
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Default Re: TEK scope excitement dashed

Chris,

I would not consider trying to put another non TEK or near alternative tube in there. If you wait a little there will be either another scope come up for sale or a tube will be offered. Enough of these TEK scopes were sold for there to be very good chance that this will happen.

Just put it down to experience.

If you are not happy with that see if you can get your monies back from the supplier it is his responsibility.If you find he is non responsive I certainly would like to know who he was toavoid pssible dealing with him. PM would do I am not suggesting you name and shame him here on the forum.

Mike
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Old 2nd Apr 2011, 10:41 pm   #34
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Default Re: TEK scope excitement dashed

What about this one?
http://cgi.ebay.co.uk/Tektronix-2215...item4158449dba
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Old 3rd Apr 2011, 9:19 am   #35
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Default Re: TEK scope excitement dashed

Quote:
Originally Posted by oldticktock View Post
if I provide photo evidence of the breakage he will send me another exact scope
My faith in human nature might be restored... fingers crossed
Chris, has your faith in human nature been restored yet?
I do hope so.
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Old 3rd Apr 2011, 9:26 am   #36
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Default Re: TEK scope excitement dashed

short answer is no
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Old 3rd Apr 2011, 12:42 pm   #37
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Default Re: TEK scope excitement- 2205 tube.

Sadly, Einovan' suggestion of tube from a 2215 is no use. It is a pda tube.
Effectively the only tube you can use comes from the D1010 series or Advance 255/300. So it will sadly be a waste of time to look for expensive sophisticated high speed scopes on ebay, and pay a huge carriage charge to get the wrong tube. Better in that case to scrap your 2205.
Removal of a tube is fairly straightforward. Look at the manual. Unplug the base. Loosen the circular clamp around the mu-metal screen at the end of the tube. Remove the usually two bolts which hold the clamp/base end of the tube/metal screen assembly to the frame. You can then slide the whole tube assembly rearwards. It may need easing around the screen end which is bedded in a rubber moulding. You may have to remove the screen cover on the front panel to press the front end out. Then disconnect or unsolder the two wires from the screen which go to the rotation coil. Gently withdraw the whole assembly. To mount in the other scope as a test, there is no need to remove the metal screen. Just plug the base on, as that has all connections. A safety tip is to wear glasses or goggles while handling the tube assembly. Bill
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Old 3rd Apr 2011, 12:52 pm   #38
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Default Re: TEK scope excitement dashed

Picking up Michael R 's point. The tubes I suggested are not near equivalents, they are exact repeats, as made for Tek, and as used in the other scopes. Those tubes seem to have been made with two different base connections, as I commented.
For other near equivalents, then as Michael R implies, you need a modicum of knowledge to make an alternative work, but it is not really very difficult as this is a very simple application using a commodity tube made by lots of manufacturers for the large market. Get the base connections is probably the hardest part. Bill m0wpn
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Old 3rd Apr 2011, 3:17 pm   #39
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Default Re: TEK scope excitement dashed

Hi Bill,

My comment was aimed at trying different tubes to see if they work. I see no problem in your suggestions , if I was Chris I would try from experienced advice and guidance from someone like yourself.

No offence was intended againsty your previous comments.I had not read the entire thread.

Regards
Mike
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Old 3rd Apr 2011, 8:17 pm   #40
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Default Re: TEK scope excitement dashed

Is the Advance OS300 different to the Gould OS300? My Gould OS300 manual gives the CRT as a Mullard 56840/GM/93. I have a Gould OS300 non-working FOC if wanted? Can't remember the history but I think I was testing it prior to sale and it went 'pop' and trace went. Not really worth spending time on now, just kept it for spares, the CRT.

Bill, how did you do the research into the different scopes, CRTs, etc? It is impressive and potentially extremely useful.

Bob

ps I do find it incredibly irritating when I get timed out when hunting down some information, and have to re-type it all in again, sometimes I can't be bothered.
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