Re: HP8568B CRT replacement question LCD?
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:
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.
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:
Hi
for the LCD CRT replacement kit take a look at the link below. Good but WAY TOO EXPENSIVE!!! I 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
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Re: HP8568B CRT replacement question LCD?
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.
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
toggle quoted message
Show quoted text
-----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: Hi
for the LCD CRT replacement kit take a look at the link below. Good
but WAY TOO EXPENSIVE!!! I 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
|
Hello, all aficionados:) I would like to use an HP 8503A Test set with
an HP 8754A , is it possible do I have to use special cable ? or is it
impossible ?
best regards to all
ON1EV
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Re: HP8568B CRT replacement question LCD?
On Sunday 14 January 2007 14:50, Sotiris wrote: Hi
for the LCD CRT replacement kit take a look at the link below. Good
but WAY TOO EXPENSIVE!!! I 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
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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,
You have a low emission CRT. Most HP CRT's are on RF instruments
where the operator feels inclined to leave the instrument on 24/7 to
keep it warmed up and stable for use at a moment's notice. This wears
out the cathode in the CRT's gun assembly, and makes it become increasingly dim, and blurry.
There are only two fixes for this problem: 1) replace the CRT, something
that is becoming more and more difficult, and 2) restore/rejuvenate the
CRT, a process that sometimes extends the useful life of the CRT for a
good while.
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
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Re: Getting 8505A working
Hi Here is the group Regards Sotiris --- In hp_agilent_equipment@..., "rovmkr" <bunge@...> wrote:
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.
|
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 CRT
used in the 8568 and 8566 series.
I use an external Tektronix X-Y-Z display which is OK but is there an LCD
X-Y-Z device available for a reasonable price, or a way to adapt a computer
display to work with the three outputs provided by the display unit? If 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
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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.
|
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?
Hi Morris, 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. Well, 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:
I have the chance to get a nice HP8601A + HP8407A setup.
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
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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...
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 -=-=-=-=-=-=-=-=-=-=-=- 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?"
|
Ebay, and search the completed listings or
Tucker, and divide by 10
-Chuck Harris
Mark wrote:
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Show quoted text
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
Yahoo! Groups Links
|
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
|
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
|
Hi Peter,
I would be interested in that PCB, please. Just across the pond!
73 de Brian, VK2GCE.
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----- Original Message -----
From: peepholenz
To: hp_agilent_equipment@...
Sent: Monday, January 15, 2007 3:51 PM
Subject: [hp_agilent_equipment] 5328A HPIB PCB
Have recently acquired a going 5328A counter.It has the HPIB option
which I will never use.If anyone is interested in the PCB (cost of
shipping ex New Zealand!) let me know.
Peter
|
Re: HP8407A Network Analyzer... opinions?
Hello my friends,
Well, I finally did it, as it was an eBay offer (so it had an ending date
yesterday night), was located locally (in Valencia, Spain, where this evening F1
world champion Alonso will present McLaren-Mercedes new car ;-) ) and price was
about right; so I have bought a working 8407A, with the 8412A display and a
8601A sweeper for the equivalent of US$284. Please, note that I am in Spain,
where HP equipment is by far less available than in other markets.
So, well, I know it has not accessories (in fact, it has not even BNC-BNC
cables!), but it was tested by the seller (I know him personally) and it works
(there were also pictures of it in the auction).
110MHz is not too high, but to start playing with network analyzers (I have
never had a _working_ one at home; I have an 8754A but currently is not
working), it should be enough. If I later find the need for higher frequencies
or functionality, will look for other options.
But by now I will stay with the 8407A :-)!. Once I have it at home I will let
you know how it works (let's hope it really does!)
Thanks for your help; don't think I have not listened to your opinions, which
have been really valuable.
Regards,
JOSE
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN) - Loc: IM99SM
Vintage Radio:
Vintage Test Equipment:
European Boatanchors List:
|
Hello!
I am VERY interested as I have the oppossite!. Please, let me know if still
available.
THANKS!!!
JOSE
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN) - Loc: IM99SM
Vintage Radio:
Vintage Test Equipment:
European Boatanchors List:
-----Mensaje original-----
De: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] En nombre de peepholenz
Enviado el: lunes, 15 de enero de 2007 5:51
Para: hp_agilent_equipment@...
Asunto: [hp_agilent_equipment] 5328A HPIB PCB
Have recently acquired a going 5328A counter.It has the HPIB option
which I will never use.If anyone is interested in the PCB (cost of
shipping ex New Zealand!) let me know.
Peter
|
Thanks Richard,
I guess that the week-end stopped other guruhs from responding.
Since Richard's mail the following has happened:
checked ground lead for -12.6V heater supply, also connected earth side to ground with lead. Even connected a 12V bulb across it result: ground connection is OK.
checked all other crimped connectors at their respective connection point result: all seem OK
checked 6.3V heater supply, put 6V bulb across it: all OK
checked connections to pots on store panel: all OK
checked all leads coming from CRT, including those coming from the top to their corresponding connections on respective boards: all OK
Could someone please confirm that the colour coding of the wiring to the neck of the CRT is as follows, looking from the front of the equipent towards the back: (9),(5),(943),(9),(5),(4) This is not obvious from the manual.
Would appreciate suggestions / advice, where to go from here.
Chris
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----- Original Message -----
From: rchrdpett
To: hp_agilent_equipment@...
Sent: Sunday, January 14, 2007 9:44 PM
Subject: [hp_agilent_equipment] Re: 141T storage failure
Chris
I had the same problem ,12.6V on the flood gun pin - no obvious flood
gun operation.
It turned out to be the ground lead from the "cold" side of the flood
gun ( pin 11, black wire )was not continuous to ground. The black
lead inner conductor was broken at the push-on connector to the HV
board. These connectors are known for poor crimping which fails after
several pushon /pulloff events.
Cheers
Richard Pett (owner of 2 systems)
--- In hp_agilent_equipment@..., "Chris van Lint"
<chrisvanlint@...> wrote:
>
> I have a problem with my 141T/8555A spectrum analyzer. The gear
works
> perfect in the conventional mode, but it will not store. When I
push the
> "store" button, the screen simply goes blank. Pushing either the
STD or FAST
> button makes it operate as a conventional CRT.
> Don Collie has very generously swapped my pulse circuit board in
his
> analyzer and has confirmed that the pulse board is OK. Indeed I
have
> checked all voltages and waveforms / amplitudes on the pulse board
and
> confirmed that they operate as expected. I have also checked all
supply
> voltages and adjusted them to be spot on. The voltages at the
various pins
> of the CRT have been checked, including the -12.6V heater voltage
for the
> flood gun and are all within limits. I have not checked the heater
voltage
> for the main gun, as the unit operates fine as a conventional
analyzer.
> Similarly I have not checked the
> 6.6KV supply, as the unit is fine in conventional mode. I did
check the
> voltage at the anode of CR23, which is -1350V as specified. The
voltage at
> the anode of CR24 varies between -2518V to 1591V in what I would
describe as
> being almost a saw tooth like fashion. Perhaps the experts can
find a clue
> in this observation.
> In sheer desperation I replaced the CRT with a brand new one I
have, (which
> of course includes a brand new infamous 3 conductor ribbon cable),
but it
> has not solved the problem. In other words everything is fine as a
> conventional analyzer, but when the "store" button is pushed,
nothing
> changes. Again voltages have been re-checked and re-adjusted and
are as
> expected according to the circuit diagram.
> I cannot perform the pulse circuit adjustments described in section
5-0 of
> the manual, simply because I cannot get past sub paragraph f, which
requires
> the fast collimator adjustment A5R14B to be adjusted so that the
entire
> flood gun illumination is visible. I cannot get any illumination
> whatsoever.
> I would be grateful for any suggestions as to what my next move(s)
should
> be.
>
> Cheers,
>
> Chris
>
|
Have recently acquired a going 5328A counter.It has the HPIB option
which I will never use.If anyone is interested in the PCB (cost of
shipping ex New Zealand!) let me know.
Peter
|
Bruce Lane
Brian