10 Nov
2005
10 Nov
'05
9:50 p.m.
Subject: RE: Discharging a VT100 CRT
From: "Julian Wolfe" <fireflyst at earthlink.net>
Date: Thu, 10 Nov 2005 15:39:26 -0600
To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk
at classiccmp.org>
Are these two parts something I can buy at RS? I don't want to have to
drive 20 miles to the nearest real component store if possible.
Well a 1n4007 at RS may still be possible, likely 2 for 1.99. I buy
them 500 for $15 from JDRmicrodevices. Can never have enough spares.
The cap I'd likely hunt around for a junk radio or computer monitor
chassis and pull it from there.
Allison
CR408 is a 1A 400V diode (1n4006 should do)
Is there any reaosn not to use a 1N4007 here as well? I generally don't
buy the other IN400x's as I've yet to find an application where too high
a PIV is a problem.
-tony 
10 Nov
10 Nov
10:45 p.m.
On 11/10/2005 at 4:50 PM Allison wrote:
The cap I'd likely hunt around for a junk radio or
computer monitor
chassis and pull it from there.
Largely OT: Another place to look is in the bases of compact
fluorescents-incandescent lamp substitutes. In the US, you can usually
find a couple of 22 or 33 ufd @ 200v caps, a bunch of diodes and
miscellaneous small caps, a small toroid and two TO-220 power transistors
of the MJE13005 variety. The latter can be very useful for deflection or
switching PSU replacements as they're rated at 4A/300-400v with a t(f) of
less than a microsecond.
Cheers,
Chuck
11:50 p.m.
I have a few things I'd like to share with those who've been following this
thread:
First, a question: Will this work as a replacement cap? It took me a while
to find this:
https://www.goldmine-elec-products.com/prodinfo.asp?number=G9173&variat…
aitem=14&mitem=24
Secondly, apparently my old VT100 outlasted someone's VT101 with the same
problem by 12 years:
Newsgroups: comp.terminals
Path: cs.utk.edu!gatech!howland.reston.ans.net!news.cac.psu.edu!usenet
From: BJJ at ECL.PSU.EDU (Bryan J Jensen)
Subject: Re: VT101 video woes...
Date: 23 Jul 1993 05:00:39 GMT
Organization: Penn State Engineering Computer Lab
Lines: 15
Message-ID: <22nr9n$orj at genesis.ait.psu.edu>
References: <CAAKnF.4qA at rice.edu>
NNTP-Posting-Host: ecl.psu.edu
In-Reply-To: adam at owlnet.rice.edu's message of Sat, 17 Jul 1993 04:33:15 GMT
In <CAAKnF.4qA at rice.edu> adam at owlnet.rice.edu writes:
I have a lovely old VT101 sitting here that I
inherited.
... I get nada on the video.
The video board is the one to the side of the CRT with all the pots.
On the video board, The 75uF, 6V capacitor C439 and its neighbor,
diode CR408, have a real bad habit of burning up.
The Flyback transformer or Horizontal Output Transistor sometimes
go bad too, of course, as they seem to in any monitor. I forget
where the transistor is.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Chuck Guzis
Sent: Thursday, November 10, 2005 4:45 PM
To: cctalk at classiccmp.org
Subject: RE: Discharging a VT100 CRT
On 11/10/2005 at 4:50 PM Allison wrote:
The cap I'd likely hunt around for a junk radio or
computer monitor
chassis and pull it from there.
Largely OT: Another place to look is in the bases of compact
fluorescents-incandescent lamp substitutes. In the US, you can usually
find a couple of 22 or 33 ufd @ 200v caps, a bunch of diodes and
miscellaneous small caps, a small toroid and two TO-220 power transistors
of the MJE13005 variety. The latter can be very useful for deflection or
switching PSU replacements as they're rated at 4A/300-400v with a t(f) of
less than a microsecond.
Cheers,
Chuck
11 Nov
11 Nov
12:37 a.m.
Should work just fine, as long as an axial lead cap will fit.
Cheers,
Chuck
On 11/10/2005 at 5:50 PM Julian Wolfe wrote:
I have a few things I'd like to share with those
who've been following
this
thread:
First, a question: Will this work as a replacement cap? It took me a
while
to find this:
https://www.goldmine-elec-products.com/prodinfo.asp?number=G9173&variat…
&
aitem=14&mitem=24
12:49 a.m.
Yeah, it's actually an axial cap on the board now.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Chuck Guzis
Sent: Thursday, November 10, 2005 6:37 PM
To: cctalk at classiccmp.org
Subject: RE: Discharging a VT100 CRT
Should work just fine, as long as an axial lead cap will fit.
Cheers,
Chuck
On 11/10/2005 at 5:50 PM Julian Wolfe wrote:
I have a few things I'd like to share with those
who've been following
this
thread:
First, a question: Will this work as a replacement cap? It took me a
while
to find this:
https://www.goldmine-elec-products.com/prodinfo.asp?number=G9173&variat…
&
aitem=14&mitem=24
6997
days inactive
6998
days old
4 comments
3 participants
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