28 Oct
2003
28 Oct
'03
3:56 p.m.
I have a 262x HP terminal, think it's a 2624. It is the "ET head" style. I
got it years ago and stuck it in a corner of the basement, and just got it
out to clean it and get it up and running. It now has lots of white spots
under the glass. Looks like mold to me. Nice perfectly round dots. But the
thing is they are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be reached
under or taken off somehow?
Thanks in advance!
Jay West
28 Oct
28 Oct
7:02 p.m.
On Tue, 2003-10-28 at 18:56, Jay West wrote:
I have a 262x HP terminal, think it's a 2624. It
is the "ET head" style. I
got it years ago and stuck it in a corner of the basement, and just got it
out to clean it and get it up and running. It now has lots of white spots
under the glass. Looks like mold to me. Nice perfectly round dots. But the
thing is they are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be reached
under or taken off somehow?
I've never seen it, but I heard about it. Apparently these are famous
for it (for some reason). I don't know what the solution is (if there
is one).
--
TTFN - Guy
9:49 p.m.
Jay
Are the spots all over the screen area or mainly around the edges? I had
this issue a while back with a HP 9845 screen- If the screens are similar,
then it's not easy, but it CAN be fixed.
Dave Brown
Christchurch, NZ
----- Original Message -----
From: "Jay West" <jwest(a)classiccmp.org>
To: <cctalk(a)classiccmp.org>
Sent: Wednesday, October 29, 2003 3:56 PM
Subject: HP 262x terminal help sought
I have a 262x HP terminal, think it's a 2624. It
is the "ET head" style. I
got it years ago and stuck it in a corner of the basement, and just got it
out to clean it and get it up and running. It now has lots of white spots
under the glass. Looks like mold to me. Nice perfectly round dots. But the
thing is they are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be
reached
under or taken off somehow?
Thanks in advance!
Jay West
29 Oct
29 Oct
2:25 a.m.
Jay,
A year or two ago Steve Loboyko (sp?) posted several messages here about
the same topic. He found that the spots were mold and were between the CRT
and the safety glass. He was able to take the safety glass off and clean
the mold out. I think he used acetone to dissolve the glue between the CRT
and safety shield. I suppose he found a way to re-apply the safefty glass
but I don't remember. You should be able to find more details in the
archives, If you can't then contact Steve and ask him about it.
Joe
At 08:56 PM 10/28/03 -0600, you wrote:
I have a 262x HP terminal, think it's a 2624. It is
the "ET head" style. I
got it years ago and stuck it in a corner of the basement, and just got it
out to clean it and get it up and running. It now has lots of white spots
under the glass. Looks like mold to me. Nice perfectly round dots. But the
thing is they are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be reached
under or taken off somehow?
Thanks in advance!
Jay West
2:44 a.m.
At 10:02 PM 10/28/03 -0800, you wrote:
A lot of the older HP stuff seems to be prone to it. I've had 9835s and
9845s with the same problem. I have an old TV that has the same problem but
other than that I seldom see it. I wonder if the HP stuff is prone to that
or if other brand items just never last long enough to develope that
problem. FWIW I have HP scopes that date to the late '60s and early '70s
but I've never seen it on them.
Joe
On Tue, 2003-10-28 at 18:56, Jay West wrote:
> I have a 262x HP terminal, think it's a 2624. It is the "ET head"
style. I
> got it years ago and stuck it in a corner of the basement, and just got it
> out to clean it and get it up and running. It now has lots of white spots
> under the glass. Looks like mold to me. Nice perfectly round dots. But the
> thing is they are UNDER the glass. Is anyone familiar with this terminal
> enough to tell me if it's now dumpster material or can this glass be
reached
under or taken
off somehow?
I've never seen it, but I heard about it. Apparently these are famous
for it (for some reason). I don't know what the solution is (if there
is one).
--
TTFN - Guy
2:55 a.m.
all over, but MOSTLY around the edges. Please share your idea to fix this!
Thanks
Jay
----- Original Message -----
From: "Dave Brown" <tractorb(a)ihug.co.nz>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Wednesday, October 29, 2003 2:49 AM
Subject: Re: HP 262x terminal help sought
---
[This E-mail scanned for viruses by Declude Virus]
Jay
Are the spots all over the screen area or mainly around the edges? I had
this issue a while back with a HP 9845 screen- If the screens are similar,
then it's not easy, but it CAN be fixed.
Dave Brown
Christchurch, NZ
----- Original Message -----
From: "Jay West" <jwest(a)classiccmp.org>
To: <cctalk(a)classiccmp.org>
Sent: Wednesday, October 29, 2003 3:56 PM
Subject: HP 262x terminal help sought
> I have a 262x HP terminal, think it's a 2624. It is the "ET head"
style.
I
> got it years ago and stuck it in a corner of the
basement, and just got
it
> out to clean it and get it up and running. It now
has lots of white
spots
> under the glass. Looks like mold to me. Nice
perfectly round dots. But
the
thing is they
are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be
reached
under or taken off somehow?
Thanks in advance!
Jay West
3:43 a.m.
I have a 262x HP terminal, think it's a 2624. It
is the "ET head" style. I
got it years ago and stuck it in a corner of the basement, and just got it
out to clean it and get it up and running. It now has lots of white spots
under the glass. Looks like mold to me. Nice perfectly round dots. But the
thing is they are UNDER the glass. Is anyone familiar with this terminal
enough to tell me if it's now dumpster material or can this glass be
reached
under or taken off somehow?
I pulled out my best ADM-3 the other day... kept in a cool (65-75 F),
dry basement and the same blasted thing has happened to it. Fortunately,
I also have a ratty one that I haven't had as long and its CRT is OK
(though a little image burned). I'll get around to swapping the CRTs
this weekend (hopefully). Did anybody figure out what causes this?
4:45 a.m.
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org]On Behalf Of Jay West
Sent: Wednesday, October 29, 2003 8:56 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: HP 262x terminal help sought
all over, but MOSTLY around the edges. Please share your idea
to fix this!
Thanks
I suppose many will think this is cheating and that it doesn't really
address the problem, but I know where there are quite a few of these
terminals available that I imagine will eventually just be junked.
I'd suggest just getting one of them for parts to fix your terminal Jay.
Meanwhile, let the repair procedure debate flow.
regards, Dan Cohoe
5:11 a.m.
Normally I would go the time consuming method to repair this, and probably
will. But if I HAD another one of these terminals, due to lack of time I'd
just skip this one. Can't believe I just said that!
Jay
I suppose many will think this is cheating and that it
doesn't really
address the problem, but I know where there are quite a few of these
terminals available that I imagine will eventually just be junked.
---
[This E-mail scanned for viruses by Declude Virus]
6:09 a.m.
On Wed, 29 Oct 2003, Dave Brown wrote:
Are the spots all over the screen area or mainly
around the edges? I had
this issue a while back with a HP 9845 screen- If the screens are similar,
then it's not easy, but it CAN be fixed.
This is a quite common maladie. I have several monitors in my collection
afflicted with this. I've not heard of any technique to fix this that
doesn't involve either removing the outer layer of laminate on the CRT or
replacing the CRT altogether.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
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6:13 a.m.
On Wed, 29 Oct 2003, Joe wrote:
A lot of the older HP stuff seems to be prone to
it. I've had 9835s and
9845s with the same problem. I have an old TV that has the same problem but
other than that I seldom see it. I wonder if the HP stuff is prone to that
or if other brand items just never last long enough to develope that
problem. FWIW I have HP scopes that date to the late '60s and early '70s
but I've never seen it on them.
This does raise an interesting point: why are some CRTs susceptible and
not others? Poor quality control? What kind of mold is this anyway? And
what the hell is it feeding on? Based on what I know makes up a CRT, it
must be some mutant radioactive strain of mold that is probably not to be
trifled with.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
6:14 a.m.
On Wed, 29 Oct 2003, Bill Sudbrink wrote:
I pulled out my best ADM-3 the other day... kept in a
cool (65-75 F),
dry basement and the same blasted thing has happened to it. Fortunately,
I also have a ratty one that I haven't had as long and its CRT is OK
(though a little image burned). I'll get around to swapping the CRTs
this weekend (hopefully). Did anybody figure out what causes this?
I also have an ADM 3A where this has happened. In fact, I might have two
like this. I wonder if it's a specific brand of CRT?
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
6:29 a.m.
They probably used protein based glue - which when moist becomes a great
culture medium.
On the other hand, I like Sellam's idea of "mutant radioactive strain of
mold"
- it sounds like a lot more "fun" than "protein based glue" ;-)
Lyle
On Wednesday 29 October 2003 09:13, Vintage Computer Festival wrote:
On Wed, 29 Oct 2003, Joe wrote:
--
Lyle Bickley
Bickley Consulting West Inc.
Mountain View, CA 94040
"Black holes are where God is dividing by zero"
A lot of the older HP stuff seems to be prone
to it. I've had 9835s
and 9845s with the same problem. I have an old TV that has the same
problem but other than that I seldom see it. I wonder if the HP stuff is
prone to that or if other brand items just never last long enough to
develope that problem. FWIW I have HP scopes that date to the late '60s
and early '70s but I've never seen it on them.
This does raise an interesting point: why are some CRTs susceptible and
not others? Poor quality control? What kind of mold is this anyway? And
what the hell is it feeding on? Based on what I know makes up a CRT, it
must be some mutant radioactive strain of mold that is probably not to be
trifled with.
6:55 a.m.
At 09:13 AM 10/29/03 -0800, Sellam wrote:
On Wed, 29 Oct 2003, Joe wrote:
I doubt it. More likely the type glue/adhasive that they use to bond the
safety glass on with.
What kind of mold is this anyway? And
A lot of the older HP stuff seems to be prone
to it. I've had 9835s and
9845s with the same problem. I have an old TV that has the same problem but
other than that I seldom see it. I wonder if the HP stuff is prone to that
or if other brand items just never last long enough to develope that
problem. FWIW I have HP scopes that date to the late '60s and early '70s
but I've never seen it on them.
This does raise an interesting point: why are some CRTs susceptible and
not others? Poor quality control? what the hell is it feeding on? Based on what I know
makes up a CRT, it
must be some mutant radioactive strain of mold that is probably not to be
trifled with.
Perhaps that's why we haven't seen Steve on the list for awhile! :-/
Joe
6:57 a.m.
At 09:14 AM 10/29/03 -0800, you wrote:
On Wed, 29 Oct 2003, Bill Sudbrink wrote:
Who made the CRTs for the ADM 3s? The ones used in the 9835s were made
by Clinton Electronics. I THINK the ones used in the 9845s were also made
by Clinton. Perhaps the name explains why they're so succeptable to crude!
Joe
I pulled out my best ADM-3 the other day... kept
in a cool (65-75 F),
dry basement and the same blasted thing has happened to it. Fortunately,
I also have a ratty one that I haven't had as long and its CRT is OK
(though a little image burned). I'll get around to swapping the CRTs
this weekend (hopefully). Did anybody figure out what causes this?
I also have an ADM 3A where this has happened. In fact, I might have two
like this. I wonder if it's a specific brand of CRT? 
8:18 a.m.
The older HP scope tubes (and, in fact, all the ones for scopes up to the
digital models, as well as the electrostatic deflection graphics displays)
were made in the tube shop at HP in Colorado Springs, so the tube
construction process was different, as HP made them internally
(HP was known for quality construction at that time...)
If I recall correctly, HP bought the magnetic deflection
displays for terminals from a 3rd party... Probably got them all
(Calculator displays 9835/9845 and 264x terminal displays) from
the same company, though they were made by different divisions...
Bill
"it" below refers to mold between the safety glass shield and the tube
surface...
Joe wrote:
...snip...snip...snip...
FWIW I have HP scopes that date to the late '60s and early '70s
but I've never seen it on them.
Joe
8:51 a.m.
New subject: Mould spots on CRT- (was Re: HP 262x terminal help sought)
Jay et al--
I originally posted this back in Sept last year- in reponse to a query from
Steve L I think-but the subject line was not all that revealing if you went
back thru the archives.
*******
Subject: Re: Nifty Find - HP2644A
2. Has anyone ever seen a CRT develop mold between
the
(bonded to the tube) safety glass and the tube itself?
Steve et al
This sounds like the problem I had a month or so back with the CRT in a
HP9845. Only in my case the mould spots had 'advanced' inwards from the edge
of the screen around 2-3 inches. Not pretty!
If you have a look you will probably find the 'seal' around the edge of the
front of the tube is taped over- virtually no real moisture barrier at all
for what is underneath.
Further- you will almost certainly find that the front of the tube itself
has a conventional bonded safety glass- the mould is in the layer of
transparent 'goo' used to attach an additional anti-glare 'cosmetically
appealing' dark glass to the front of the safety glass on an ordinary CRT.
The 'goo' in the case of the 9845 CRT was very similar in texture to silicon
rubber-possibly was- and the layer was a bit over an eighth of an inch
thick. Likewise the dark glass on the front.
(The
I tried several solvents on the 'goo' (after removing CRT from 9845 of
course!) and found ordinary petrol to be fairly effective- there are no
doubt better solvents but it worked.
Judicious use of a piece of piano wire and weights was tried, with the CRT
mounted in a temporary wooden frame, but the most rapid way to get the goo
out was (you are outside or in a well ventilated area - right!) to dribble a
generous amount of petrol into the goo- wait about a minute, and carefully
dig out the softened stuff with a long thin screwdriver. It's tedious work
and I did it in several stages but it was not difficult.
End result- cleaned 'em up and got a perfectly useable CRT and separate
'anti glare' glass.
I reassembled them with an air gap and 'goo' in the screen corners only-
its easy enuff to get into the gap and clean it out now- should the need
arise again. Visually no difference- except maybe a bit brighter screen
image.
Essential point to note- make sure the tube has a bonded safety glass-- in
this case it was difficult to actually tell till I had it out and removed
all the black tape around the edge of the screen.
DaveB
Ch Ch NZ
----- Original Message -----
From: "Jay West" <jwest(a)classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Thursday, October 30, 2003 2:55 AM
Subject: Re: HP 262x terminal help sought
all over, but MOSTLY around the edges. Please share
your idea to fix this!
Thanks
Jay
10:13 a.m.
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11:27 a.m.
On Wed, 29 Oct 2003, Joe wrote:
At 10:02 PM 10/28/03 -0800, you wrote:
A lot of the older HP stuff seems to be prone to it. I've had 9835s and
9845s with the same problem. I have an old TV that has the same problem but
other than that I seldom see it. I wonder if the HP stuff is prone to that
or if other brand items just never last long enough to develope that
problem. FWIW I have HP scopes that date to the late '60s and early '70s
but I've never seen it on them.
Joe
I suspect that it is more a function of who produced the tube. I
have a DEC VR201 that also has the same problem.
- don
On Tue, 2003-10-28 at 18:56, Jay West wrote:
> I have a 262x HP terminal, think it's a 2624. It is the "ET head"
style. I
> got it years ago and stuck it in a corner of the basement, and just got it
> out to clean it and get it up and running. It now has lots of white spots
> under the glass. Looks like mold to me. Nice perfectly round dots. But the
> thing is they are UNDER the glass. Is anyone familiar with this terminal
> enough to tell me if it's now dumpster material or can this glass be
reached
under or
taken off somehow?
I've never seen it, but I heard about it. Apparently these are famous
for it (for some reason). I don't know what the solution is (if there
is one).
--
TTFN - Guy
7577
days inactive
7578
days old
19 comments
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