20 Feb
2000
20 Feb
'00
5:36 a.m.
I got a couple of "free" VT320 terminals with a system I picked up and they
both work but they are both pretty dim. (one is reasonably bright after a
30 - 40 minute warm up). Now in the video game market there are kits to
rejuvenate a tube but I don't know what the equivalent would be for a
VT320. Tony? Anyone? Is there anything I can do?
--Chuck
20 Feb
20 Feb
7:26 a.m.
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22 Feb
22 Feb
12:27 a.m.
Hi Tony,
In my experience, VT3xx terminals are known for eating
flyback
transformers....
Good oh, that fills me with confidence - I just picked up another VT3xx (a
340) along with another MicroVAX II at the weekend.
BTW I have a VT330 (or possibly a 320) which won't power up properly. When I
power it up I hear a click from the sounder in the keyboard and the PSU
shuts down, the it tried to power up again, clicks, powers down, etc etc....
Have you ever come across such a problem before?
I'd start by cleaning the screen. Yes, you can
laugh, but it caught
me once, on a VT100....
Ditto, same thing caught me out a couple of times in the past. It's ALWAYS
worth giving the screen a clean in these circumstances.
TTFN - Pete.
--
Hardware & Software Engineer. Sound Engineer.
Collector of Arcade Machines, Games Consoles & Obsolete Computers (esp DEC)
peter.pachla(a)wintermute.org.uk | www.wintermute.org.uk
--
5:06 a.m.
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28 Feb
28 Feb
3:03 a.m.
Hi Tony,
....And the most likely cause of that is a shorted
flyback
transformer....
....Seen it dozens of times....
Thanks, it's what I feared....I was kind of hoping it would be something
else.
Pull the case and look at the flyback transformer....
....Most likely it'll be visibly cracked!
The unit is currently at the bottom of a (large) pile of pending projects,
I've gotta pull some stuff from that pile this week so I'll drag it out and
take a look.
I've got several other 320/330/340's so it's not exactly a top priority
IYKWIM?
TTFN - Pete.
--
Hardware & Software Engineer. Sound Engineer.
Collector of Arcade Machines, Games Consoles & Obsolete Computers (esp DEC)
peter.pachla(a)wintermute.org.uk | www.wintermute.org.uk
--
20 Feb
20 Feb
10:48 a.m.
Chuck,
Those kits are usually just a simple autotransformer that boast the
filament voltage by 30% or so. Since it's a transformer it will work on
any AC voltage within reason. You just have to find one that matchs the CRT
plug. FWIW if those terminals have a cover over the CRT, take it off and
clean it and the front of the CRT. It's surprising how much dust gets in
between them over the years.
Joe
At 11:36 AM 2/20/00 -0800, you wrote:
I got a couple of "free" VT320 terminals with
a system I picked up and they
both work but they are both pretty dim. (one is reasonably bright after a
30 - 40 minute warm up). Now in the video game market there are kits to
rejuvenate a tube but I don't know what the equivalent would be for a
VT320. Tony? Anyone? Is there anything I can do?
--Chuck
11:03 a.m.
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8846
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ard＠p850ug1.demon.co.uk -
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