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Re: HP8568B CRT replacement question LCD?
you think that the crt beam is wearing out the phosphor? "ion burns???
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i thought aluminized tubes were immune to ion burns? i have found that tek crts last allot longer then hp ones ----- Original Message -----
From: John Miles To: hp_agilent_equipment@... Sent: Wednesday, January 17, 2007 7:41 PM Subject: RE: [hp_agilent_equipment] Re: HP8568B CRT replacement question LCD? >Alternately, consider what it costs to have these instruments repaired >for business use. We have several (4 at last count) 8566B where I work, >and the minimum repair cost is a flat $3,500. The CRTs are still OK on >those because we have consistently been able to enforce the rule of >turning brightness down when not in use Don't do that -- make 'em hit shift-G/shift-H! -- john, KE5FX |
Re: HP8568B CRT replacement question LCD?
John Miles
Alternately, consider what it costs to have these instruments repairedDon't do that -- make 'em hit shift-G/shift-H! -- john, KE5FX |
Re: HP8568B CRT replacement question LCD?
Didier Juges
I agree that the cost of the CRT replacement LCD is fair, considering
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the work that went into its design. Alternately, consider what it costs to have these instruments repaired for business use. We have several (4 at last count) 8566B where I work, and the minimum repair cost is a flat $3,500. The CRTs are still OK on those because we have consistently been able to enforce the rule of turning brightness down when not in use, but I am not sure how much longer that will last. I can promise you the first one with a weak CRT will get the LCD treatment. We do have those repaired not even so much to save on the cost of new ones (we have a number of newer SA's too, such as 8565E and others) because for a lot of things we do, they work better than the new stuff. The FFT driven instruments are great to look at signals, they suck when you want to look at (and measure) noise. Didier Kuba Ober wrote: On Sunday 14 January 2007 14:50, Sotiris wrote: |
Re: HP8568B CRT replacement question LCD?
On Wednesday 17 January 2007 15:15, John Miles wrote:
The problem is, I think you have to compare it to what it costs to buyI'm thinking of something universal, i.e. a board which can then interface to any reasonably sized TFT LCD with standard flat panel digital inputs. Cheers, Kuba |
Re: HP8568B CRT replacement question LCD?
Hi
Exactly that was the base of my comments on the price of te LCD replacement... When I saw it at first, I was almost ready to buy it... and then I asked about the price of it. :(( ~1800U$ plus shipping to Greece... make it go up to 2K's that is almost 1650 Euros... then I've done the maths... Got two Display units 85662A, one with an almost brand new CRT and one that had run a lot, but it is still at a real good working condition, without any signs of failing CRT. Not expected soon at least! So lets say the second one has at least 2000 hours before I 'll start worrie about repairing it... Now I take measures with that analyzer almost every 2nd day. It is powered for 2-4 hours its time, for production testing... Say 3 hours average... or better, 2 hours EVERY day! These figure shows that I got 1000 days left. If you exclude the weekends on a year basis, then these is aproximatelly 3 working years! The 8568B I have it on, cost me 1250 Euros complete, with the shipping to GREECE! If i need 1650 Euros to replace the CRT only, plus the repairing time needed, then anyone can understand that it would be better (and more economical of course) to buy another complete set! Not even considering to use John Miles guide to restore tube for at least 800 hours (meaning 1.5 years more?) after complete failure of it! Second opton is to buy two 85662A Display units and keep them for replacement units. That option also is costless than buying 1 LCD unit. And Kuba, I also understand very well what this cost and what work have been put on it. And yes the market isn't so large for it (?), and that will keep that way, at that price! However, considering that those displays was used on some of the best selling analyzers (when you add all the 67,68 A/B, 66 A/B of the 856x series, sold all these 23 years of production run) you can estimate that there is a huge number for marketing a device like it! But in IMHO it's not a *fair* price considering all the above... It might be fair on some eyes, but not to mine! Best regards Sotiris --- In hp_agilent_equipment@..., "Mark" <marks@...> wrote: to buy another complete 8566/8568 display. Often, less than $1000will get you one of those with a usable (if not perfect) CRT.forbetter if they targeted the 8560 portables, too. Those don't go less than $4K in any condition.Ober that'sSent: Wednesday, January 17, 2007 5:31 AMquestion a *very*afair price. Considering that a dead CRT makes those devices lessuseful (nottotally dead, but still), I wouldn't object to such a price, if Iused theunit for business.and given similar,brand new instrument, for the price of the old one, the kit, andyour time(or someone else's service) to bring it up to spec. |
Re: HP8568B CRT replacement question LCD?
Mark
It is a pity theydon't make a cheaper monochrome replacement screen.
As John said you can pick up a good display on the big auction for ~$500 Marks. VK2HMC. --- In hp_agilent_equipment@..., "John Miles" <jmiles@...> wrote: buy another complete 8566/8568 display. Often, less than $1000 will get you one of those with a usable (if not perfect) CRT. better if they targeted the 8560 portables, too. Those don't go for less than $4K in any condition. question LCD?Good the displaybut WAY TOO EXPENSIVE!!!I don't think so. They had to develop custom electronics to read memory and feed it to the LCD, with colors applied. I'd say that'sa *very* fair price. Considering that a dead CRT makes those devices lessuseful (not totally dead, but still), I wouldn't object to such a price, if Iused the unit for business.and given their volume and a need for at least *some* profit, they sell itfor a fair price, IMHO.similar, brand new instrument, for the price of the old one, the kit, andyour time (or someone else's service) to bring it up to spec. |
Re: HP8568B CRT replacement question LCD?
John Miles
The problem is, I think you have to compare it to what it costs to buy another complete 8566/8568 display. Often, less than $1000 will get you one of those with a usable (if not perfect) CRT.
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I think it's a great modification, but I also think they'd do better if they targeted the 8560 portables, too. Those don't go for less than $4K in any condition. -- john, KE5FX -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]On Behalf Of Kuba Ober Sent: Wednesday, January 17, 2007 5:31 AM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] Re: HP8568B CRT replacement question LCD? On Sunday 14 January 2007 14:50, Sotiris wrote: HiI don't think so. They had to develop custom electronics to read the display memory and feed it to the LCD, with colors applied. I'd say that's a *very* fair price. Considering that a dead CRT makes those devices less useful (not totally dead, but still), I wouldn't object to such a price, if I used the unit for business. I have a feel for how much work it'd take to develop such a unit, and given their volume and a need for at least *some* profit, they sell it for a fair price, IMHO. To figure if it's worth it, think about whether you could afford a similar, brand new instrument, for the price of the old one, the kit, and your time (or someone else's service) to bring it up to spec. Cheers, Kuba |
Re: HP8568B CRT replacement question LCD?
On Sunday 14 January 2007 14:50, Sotiris wrote:
HiI don't think so. They had to develop custom electronics to read the display memory and feed it to the LCD, with colors applied. I'd say that's a *very* fair price. Considering that a dead CRT makes those devices less useful (not totally dead, but still), I wouldn't object to such a price, if I used the unit for business. I have a feel for how much work it'd take to develop such a unit, and given their volume and a need for at least *some* profit, they sell it for a fair price, IMHO. To figure if it's worth it, think about whether you could afford a similar, brand new instrument, for the price of the old one, the kit, and your time (or someone else's service) to bring it up to spec. Cheers, Kuba |
Re: HP8568B on screen text intensity
That would be Test Equipment Plus which I pointed out to the group some
months back when we were having a discussion on weak/failing CRTs in 856x units. Web site: <BLOCKED::> Not inexpensive however. - Greg _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Didier Juges Sent: Saturday, January 13, 2007 7:44 AM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] HP8568B on screen text intensity Chuck Harris wrote: Hi David,increasingly dim, and blurry.There is a third fix: a company (I forgot whom, but they should not be too hard to google, or John Miles can post it here) makes a color LCD replacement for the entire display. Pretty neat, and great use of color. It's not cheap, but worth it, considering what these instruments are worth in good condition. This replacement makes it better than new! Didier KO4BB |
Re: Getting 8505A working
Hi
Here is the group Regards Sotiris --- In hp_agilent_equipment@..., "rovmkr" <bunge@...> wrote: good scans with: 28 pages of a Brochure overview, 39 pages of theOperating Guide, 328 pages of the Operating and Service Manual Vol 1, 399pages of the Operating and Service Manual Vol 2, 476 pages of theOperating and Service Manual Vol 3, and 17 pages of a Programming Note andThe schematics are quite good but have the usual problem of shadedareas making reading certain areas difficult. Printing on 11 x 17" pagesseen pictures of this analyzer with only very short cables to the S-not even my own posts. Can anyone explain. |
Re: HP8568B CRT replacement question LCD?
On Sunday 14 January 2007 13:40, k6yaz@... wrote:
It was mentioned that there is an LCD replacement available for a tired CRTIf there is interest in it, I think I could kit a bunch of X-Y-Z to VGA units (a small box with 15 pin VGA connector, an RS-232 connector for setup, three BNCs, and a 12V supply input). The cost would be in vicinity of $500 as far as I can tell. Possibly subsequent units (after first 10) could cost less. What would be a typical X/Y bandwidth such displays are expected to have? I'd be using 10 bit A/D converters on all channels (X,Y,Z), all with same bandwidth, but what's the bandwidth is the question. The output would be scaled to a standard 1024x768 or 1280x1024 resolution, the signals would be generated in FPGA (no stock graphics controller etc). There would be a limited color-programmability, likely a bunch (4 or 8) rectangular areas could have non-default colors, and possibly a digital "color switch" input could be provided as well. This is limited by how many quad comparators (x0,x1,y0,y1) I can squeeze into a cost-efficient FPGA. If I could get 10 "serious enough" potential buyers, I'd go ahead and get it rolling. Cheers, Kuba |
Re: Getting 8505A working
I just got my set of manuals from Artecmedia and they look like good
scans with: 28 pages of a Brochure overview, 39 pages of the Operating Guide, 328 pages of the Operating and Service Manual Vol 1, 399 pages of the Operating and Service Manual Vol 2, 476 pages of the Operating and Service Manual Vol 3, and 17 pages of a Programming Note and introdutory guide to using the HP 8505A with the HP 9826A computer. The schematics are quite good but have the usual problem of shaded areas making reading certain areas difficult. Printing on 11 x 17" pages makes them quite readable. They are well worth getting (E-Bay). They show the original matched cables as two feet long but I have seen pictures of this analyzer with only very short cables to the S- parameter Test Set. Any comments? On another matter... I thought someone (John?) had started another thread on the 8505A but when I do a search on 8505A I get nothing, not even my own posts. Can anyone explain. |
meter bezel needed
Ray Robinson
Hi ganag,
My HP 6267 power supply has been dropped and the meter bezels broken. I have repaired the unit, fixed the meters, but I need 2 bezels. They are a grey plastic square surround for the square meter, and they clip the meter to the font panel. The size is 3 5/8" wide, 1 3/4" high. I've looked on ebay and searched but have not found a source. Does anyone know whre I can buy them? Regards Ray vk2ilv |
Re: HP8407A Network Analyzer... opinions?
Jose V. Gavila
Hi Morris,
If you get the 8601A you might like to start looking for a 8600A to goWell, I should say that I already had a couple of 8601As _and_ an 8600A (LED version and in very good shape). BUT I have not yet used it; in fact, I put them in storage some weeks ago as, just for sweeping, I didn't find it was enough reason to keep them in the workbench. But now, once I get the 8407A, I will set it up along the 8601A and 8600A... that way I will have a decent VNA up to 110MHz, right? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) - Loc: IM99SM Vintage Radio: Vintage Test Equipment: European Boatanchors List: |
Re: HP8407A Network Analyzer... opinions?
--- In hp_agilent_equipment@..., "Jose V. Gavila"
<eb5agv@...> wrote: Hi Jose, If you get the 8601A you might like to start looking for a 8600A to go with it. The 8600A is a marker generator/counter that puts up to 5 little intensified dots on the sweep trace at continuously variable frequencies. The older models use nixie displays and the more modern ones have 7 segment LEDs. Sweeping is a real pleasure with that combo. 73, Morris |
Re: Surplus Equipment...
Suggest joining the TekScopes group on Yahoo. Lots of Tekkies (myself included).
For my part, the only unit I'm looking for at the moment is a calibration generator. Something like a CG551AP, CG5011, etc., with the output heads. Keep the peace(es). * REPLY SEPARATOR * On 15-Jan-07 at 12:24 Mark wrote: Hi Folks... -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
Re: Surplus Equipment...
Ebay, and search the completed listings or
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Tucker, and divide by 10 -Chuck Harris Mark wrote: Hi Folks... |
Re: Surplus Equipment...
On eBay try out the "Marketplace Research", it will show up to 3 months of data
on the item your interested in. _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Mark Sent: Monday, January 15, 2007 6:24 AM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Surplus Equipment... Hi Folks... Recently, I have had to significantly downsize my audio business due to medical problems and find myself with an over abundance of HP and Tektronix equipment. Can someone tell me where I might find an average selling price and place to sell this equipment? Thanks folks... Mark Absolute Sound Labs- Minneapolis |
Surplus Equipment...
Mark
Hi Folks...
Recently, I have had to significantly downsize my audio business due to medical problems and find myself with an over abundance of HP and Tektronix equipment. Can someone tell me where I might find an average selling price and place to sell this equipment? Thanks folks... Mark Absolute Sound Labs- Minneapolis |
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