19 Aug
2001
19 Aug
'01
7:14 p.m.
Ok you people that use this everyday - I have a ceramic disk capacitor from
a power supply that went south - brown and cracked. I can read the etched
value on it though but it's been a long time since I've seen this type of
marking. It has as follows:
(first line unreadable, looks like MDE)
2200M
X7B or X78
1KV
I see it as 1 kilovolt, that's obvious but I've been using the new system
that is in picofarads and not sure if that is supposed to mean 2200 uF or if
it is some old way of marking 2200 pF. Also what would be the current
marking number system equivelant (ie 222, 224, etc) for replacement. Most of
my "junk box" parts are new system markings and I am not in the mood for a
fire or replacement of other items if I get it wrong.
When put on a cap tester I get 100pf which I feel is wrong and may be due to
a shorted state or something. Capacitors have never been my strong point in
identification.
20 Aug
20 Aug
1:43 p.m.
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10:59 p.m.
New subject: where can a replacement CRT be found?
Does anyone know who might carry a replacement CRT for
an old mid 60s display? The manufacturer and part
number are: Conrac 14386P39
--tnx
--tom
21 Aug
21 Aug
12:16 a.m.
New subject: where can a replacement CRT be found?
You want the whole unti or just the tube?
-> -----Original Message-----
-> From: owner-classiccmp(a)classiccmp.org
-> [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tom Uban
-> Sent: Monday, August 20, 2001 10:59 PM
-> To: classiccmp(a)classiccmp.org
-> Subject: where can a replacement CRT be found?
->
->
-> Does anyone know who might carry a replacement CRT for
-> an old mid 60s display? The manufacturer and part
-> number are: Conrac 14386P39
->
-> --tnx
-> --tom
->
->
8:06 a.m.
New subject: where can a replacement CRT be found?
Just the tube.
At 12:16 AM 8/21/01 -0500, you wrote:
You want the whole unti or just the tube?
-> -----Original Message-----
-> From: owner-classiccmp(a)classiccmp.org
-> [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tom Uban
-> Sent: Monday, August 20, 2001 10:59 PM
-> To: classiccmp(a)classiccmp.org
-> Subject: where can a replacement CRT be found?
->
->
-> Does anyone know who might carry a replacement CRT for
-> an old mid 60s display? The manufacturer and part
-> number are: Conrac 14386P39
->
-> --tnx
-> --tom
->
->
5:12 p.m.
New subject: where can a replacement CRT be found?
Try this one, not sure if it's current but it's where I used to buy from
until the first of this year. They sell tubes for data displays, marine,
medical, instrumentation, broadcast, CCTV, etc.
USA:
Richardson Electronics, LTD
1-800-222-2787
UK:
Richardson Electronics (Europe) LTD
Inspring House
Searby Road
Lincoln LN2 4DT
England
(01522) 542631
-> -----Original Message-----
-> From: owner-classiccmp(a)classiccmp.org
-> [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tom Uban
-> Sent: Tuesday, August 21, 2001 8:06 AM
-> To: classiccmp(a)classiccmp.org
-> Subject: RE: where can a replacement CRT be found?
->
->
-> Just the tube.
->
-> At 12:16 AM 8/21/01 -0500, you wrote:
-> >You want the whole unti or just the tube?
-> >
-> >-> -----Original Message-----
-> >-> From: owner-classiccmp(a)classiccmp.org
-> >-> [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tom Uban
-> >-> Sent: Monday, August 20, 2001 10:59 PM
-> >-> To: classiccmp(a)classiccmp.org
-> >-> Subject: where can a replacement CRT be found?
-> >->
-> >->
-> >-> Does anyone know who might carry a replacement CRT for
-> >-> an old mid 60s display? The manufacturer and part
-> >-> number are: Conrac 14386P39
-> >->
-> >-> --tnx
-> >-> --tom
-> >->
-> >->
-> >
-> >
->
1:27 p.m.
New subject: where can a replacement CRT be found?
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3:16 p.m.
New subject: where can a replacement CRT be found?
What's wrong with the existing CRT? Lost it's
vacuum? Open-circuit
heater? Inter-electrode shorts? If none of those, you should be able to
get something on the screen with it?
The protective layer is delaminating from the tube.
I would guess the P39 is the screen phosphor (IIRC
that's a common green
phosphor). Similar CRTs with a different phosphor should work.
Yes it is the phosphor type. Since the tube is from a vector graphics display
(my Imlac), I think that it needs the long persistence properties of the P39.
I did locate (using google) the company http://www.questinc.com which has
a P4 replacement CRT and can also remanufacture the existing tube. If I
recall, P4 is a white phosphor isn't it? How does P4 compare to P39 for
persistence? I don't have prices yet, but I am interested in the remanufacture
possibility, if the risk is not too high. The tube is mostly useable as is,
but the corners are getting a little anoying...
I wasn't aware Conrac made their own CRTs (I've
only come across monitors,
etc made by them). So it may be a specially selected part (for some
performance characteristic), but otherwise be a standard CRT. You might
find another CRT that will at least work reasonably well in this unit.
How much do you know about it (dimensions, deflection angle, pinout,
heater voltage, other electrode voltages?)
It is a 15" diagonal (10"x13") and about 16" from the face to the end
of
the neck. Here is a picture of the tube electronics:
http://www.ubanproductions.com/imlac_monitor.jpg
--tom
4:21 p.m.
New subject: where can a replacement CRT be found?
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23 Aug
23 Aug
8:49 a.m.
New subject: humorous descriptions of ebay item
While this is a nice looking system:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1267818946
The seller clearly has no clue. They are describing RK05s as tape
drives and RK05 packs as cassettes! Good for a laugh anyway...
--tom
11:56 a.m.
New subject: humorous descriptions of ebay item
While this is a nice looking system:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1267818946
The seller clearly has no clue. They are describing RK05s as tape
drives and RK05 packs as cassettes! Good for a laugh anyway...
--tom
Personally it looks to me as if the seller is very clueful, especally if
they get the manual pic's up. I don't see anywhere, where they're listing
RK05's as tape drives, though I do see a DECcassette drive. They say a
picture is worth a thousand words, and those pic's sure speak a lot! I
wish I had room for and could afford that system!
The eBay page above has the following link
http://www.fibraplex.com/PDP8/ultimate_pdp.htm that will be of more
interest to people, especially as the auction is currently sitting at
$1200.00. And before anybody starts screaming about that price, from what
I'm seeing in the pic's that's not to bad of a price if it's a working
system (and it sounds like it should be).
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
1:09 p.m.
New subject: humorous descriptions of ebay item
If you cycle the pictures with the little arrow at the right and then
pick the photo of the two RK05s... I'm guessing that the seller is not
the person who carefully stored this system over the years.
--tom
Personally it looks to me as if the seller is very
clueful, especally if
they get the manual pic's up. I don't see anywhere, where they're listing
RK05's as tape drives, though I do see a DECcassette drive. They say a
picture is worth a thousand words, and those pic's sure speak a lot! I
wish I had room for and could afford that system!
The eBay page above has the following link
http://www.fibraplex.com/PDP8/ultimate_pdp.htm that will be of more
interest to people, especially as the auction is currently sitting at
$1200.00. And before anybody starts screaming about that price, from what
I'm seeing in the pic's that's not to bad of a price if it's a working
system (and it sounds like it should be).
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
1:30 p.m.
New subject: humorous descriptions of ebay item
If you cycle the pictures with the little arrow at the
right and then
pick the photo of the two RK05s... I'm guessing that the seller is not
the person who carefully stored this system over the years.
OK, by looking at the page source I see what you're talking about. It
looks like the first one is labled by as a PDP-8/i :^) One problem I see
is that you're seeing a different web page than I am. Stinking Javescript!
I guess I should be thankful that I can see the pics.
Still it's a very nice system.
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
2:05 p.m.
New subject: humorous descriptions of ebay item
At 11:30 AM 8/23/01 -0700, you wrote:
Yes, there are a number errors in the picture labels. Why are you
seeing a different page? Aren't we both looking at this one?
http://www.fibraplex.com/PDP8/ultimate_pdp.htm
Or is your browser lacking in capability?
If you cycle
the pictures with the little arrow at the right and then
pick the photo of the two RK05s... I'm guessing that the seller is not
the person who carefully stored this system over the years.
OK, by looking at the page source I see what you're talking about. It
looks like the first one is labled by as a PDP-8/i :^) One problem I see
is that you're seeing a different web page than I am. Stinking Javescript!
I guess I should be thankful that I can see the pics. Still it's a very nice system.
I never said it wasn't a nice system. I would take it if: a) money was
no object, b) I had room to set it up, and c) it wasn't so far away (see
(a))
--tom
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
8535
days inactive
8539
days old
13 comments
4 participants
participants (4)
-
ard＠p850ug1.demon.co.uk -
healyzh＠aracnet.com -
rhblake＠bigfoot.com -
uban＠ubanproductions.com