16 Jul
2002
16 Jul
'02
3 p.m.
On Jul 16, 23:41, Dave Brown wrote:
I don't have too much concern using the CRT
without the protective screen
bonded back on if I have to- something totally separate can be arranged
fairly easily due to the shape of the CRT bezel. But if I can get it
off,
then rebonding it with something similar (but not
hygroscopic) should not
be
too difficult.
I remember when I was a teenager and started fixing old tellys, that many
of them had a flat laminated glass sheet, about 1/4" thick, in front of a
plain CRT. The laminated glass was mounted in the cabnet, not bonded to,
or even touching, the CRT. So that might be a reasonable thing to do in
this case. Polycarbonate might be even better (and easier to handle).
--
Pete Peter Turnbull
Network Manager
University of York
16 Jul
16 Jul
3:09 p.m.
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17 Jul
17 Jul
2:07 a.m.
----- Original Message -----
From: "Tony Duell" <
My only worry would be if the CRT envelope requires
the extra bonded
faceplate for strength. In other words, is the remaining glass layer
thick enough to withstand atmospheric pressure?
Fair comment but I doubt it's an issue. This CRT has the look of an HP
jackup to it- it's basically a plain vanilla green screen CRT that looks
like they literally just glued this other stuff on it's front. I've never
seen anything quite like it before. Most of the computer terminals from this
era ( eg Ball monitors etc) had unbonded tubes I think- with separate
safety glass, often curved and usually tinted- this looks like HP were
trying to make it all look a bit better cosmetically without too much extra
expense.
I had a 'disposal' contract with ICL locally thru most of the 70's and early
80's--bonded CRTs only started to appear in their terminals towards the end
of that period. Think I tossed out the last of the 10" Ball monitors and
spares fairly recently.
Dave B, NZ
3:21 p.m.
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1:54 a.m.
----- Original Message -----
From: "Pete Turnbull" <pete(a)dunnington.u-net.com>
I remember when I was a teenager and started fixing
old tellys, that many
of them had a flat laminated glass sheet, about 1/4" thick, in front of a
plain CRT.
Exactly what I had in mind as an alternative. The 9845 screen surround lends
itself to doing that very easily and 'elegantly' as it projects forward
about an inch or so- all the way round.
Reminds me of the first TV I ever had-- an old Ekco (darned if I know how
that fine product of the UK got to NZ-'twas a 'modified' dual std beast --
405 and 625 line stds- for the usa readers) It had a 1/4 inch plate glass
separate screen about an inch out front of the tube face. Several NZ TV set
manufacturers had the same arrangement in the early years.
That Ekco had horrible series filament tubes types in it- real oddball
ones- One night the picture started to get smaller and brighter-- finally
disappeared with a mild band about three days later so I went out and got a
replacement- but it lasted several years-- what a dog!!! But it was cheap at
the time.
Dave B, NZ
3:19 p.m.
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4:45 p.m.
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <cctalk(a)classiccmp.org>
Sent: Thursday, July 18, 2002 9:21 AM
Subject: Re: CRT problem
> Reminds me of the first TV I ever had-- an old
Ekco (darned if I know
how
> that fine product of the UK got to NZ-'twas a
'modified' dual std
east --
> 405 and 625 line stds- for the usa readers) It
had a 1/4 inch plate
glass
Made it to Oz as well. We had one of those as our very first tv set circa
1963.
Finally blew up permanently around 1969. (As in smoke/flame etc). Mum &
Dad
bought a Kriesler, still valve based. (No colour here until mid 70's).
Worked fairly well, needed a visit from a valve jockey about once a year on
average.
the 1S2 EHT Rectifier and/or the 6CM5 HOP valve were the usual culprits.
Some of the Decca valve/transistor Colour hybrids made it here as well.
Fixed one for some friends as recently
as 5 years ago. AFAIK, it's still going. They called a local tv repair
place, the guy took
the back off and stared at it for a minute or so, then put the back on and
told them he had
no idea where to get valves these days. So they rang me.
10 min and a Line Output tube later, it was going again. (I had a small
collection of valves,
mostly ex tv stuff, fortunately I had one of the right type.)
Cheers
Geoff
5:02 p.m.
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5:49 p.m.
Tony Duell wrote:
> Some of the Decca valve/transistor Colour hybrids made it here as well.
I thought Decca was a record company famous
for such standards as Ella Fitzgerald.
Or is this another one of those "Lyon"
stories like when a restaurant chain became
a computer company, a record company made
tubes. :)
6:09 p.m.
----- Original Message -----
From: "Ross Archer" <archer(a)topnow.com>
To: <cctalk(a)classiccmp.org>
Sent: Thursday, July 18, 2002 12:16 PM
Subject: Re: CRT problem
Tony Duell wrote:
>
> > Some of the Decca valve/transistor Colour hybrids made it here as
well.
I thought Decca was a record company famous
for such standards as Ella Fitzgerald.
Or is this another one of those "Lyon"
stories like when a restaurant chain became
a computer company, a record company made
tubes. :)
Decca made lots of things. Radio, radar etc.
Even hyperbolic radio navigation systems amongst other things. Decca (the
nav system) is the same/similar to LORAN.
LORAN, OMEGA and other similar style systems were a sort of predecessor to
GPS using LF and VLF radio from a series
of ground stations.
Trivia:
It's a little known fact that during WW2 the Germans built such a system
that covered the Bay of Biscay, apparently for
the use of their U Boats. The Brits, via Enigma decodes and such became
aware of it, analysed it and were prepared to jam it.
Before they did, however, British Scientific Intelligence asked RAF Coastal
Command if they could use an accurate radio nav system that
covered the Bay of Biscay. Told YES in no uncertain terms, charts and
equipment to use it were produced, and Coastal Command used the system
the Germans had so kindly provided with great success until the wars end.
The system was taken over post war and was still in use for marine nav
in the region until relatively recently, (around 10-15 years ago IIRC).
Geoff in Oz
18 Jul
18 Jul
5:41 p.m.
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17 Jul
17 Jul
5:51 p.m.
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <cctalk(a)classiccmp.org>
Sent: Thursday, July 18, 2002 11:23 AM
Subject: Re: CRT problem
First Philips sets here were the C9 chassis, closely followed by the K9's.
Still a few of them around. They had a habit of the tubes fracturing at the
point where the neck is bonded on as they got on in years (like 20+)
<SNIP>
Some of the
Decca valve/transistor Colour hybrids made it here as well.
Hey, I remember those too. I also remember (just) the Philips G6 colour
set with a mostly valved colour decoder. That was _complicated_... Still
have schematics for them as well.... If it came from the UK, I'll bet it was a PL509 or
equivalent. Colour
sets _always_ used that line output valve...
Can't remember for sure, sounds right though.
Cheers
Geoff
18 Jul
18 Jul
5:42 p.m.
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17 Jul
17 Jul
11:21 p.m.
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
Almost all UK TVs used series-string heaters. Normally
P-series valves (P
= 300mA heater), or their equivalents (such as the Mazda 30xx series (30,
again, meaning 300mA).
Some of the ones I remember in that Ekco were definitely in the 30 prefix
series -- pretty much unknown here- but there were P series (well known
here) equivalents or near equivalents, needing only one or two base wiring
changes!!
Loved the OT tube/valve list- lotsa memories- and not all bad!!
DaveB
18 Jul
18 Jul
5:41 p.m.
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8036
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14 comments
5 participants
participants (5)
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archer＠topnow.com -
ard＠p850ug1.demon.co.uk -
geoffrob＠stmarks.pp.catholic.edu.au -
pete＠dunnington.u-net.com -
tractorb＠ihug.co.nz