9 Sep
1999
9 Sep
'99
1:12 p.m.
Thanks Tondy. I was hoping to hear from you on this matter. I'll see if I
can find a suitable replacement
- Mike: dogas(a)leading.net
-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Friday, September 10, 1999 5:50 PM
Subject: Re: CRT replacements for NS Advantage???
>
> Help!
>
> I just had a Northstar Advantage shipped to me and because of the shoddy
> packaging job, the CRT is history. The back of the tube is broken. I'm
sad
and I'm
pissed. I hate seeing equipment so mishandled.
Ouch!!!
Are there any compatible organ doners out there or suggestions for a
possible revival?
There is no way you'll repair the original CRT if the glass is broken (or
even cracked).
Fortunately, there appear to be only 2 common flavours of monochrome CRT
used in terminals/monitors. One type has a 8 pin B8H base (like an
International Octal with thin pins and a large spigot), a thick neck, and
a 6.3V heater. The other has a 'modified B7G base' (like a 7 pin
miniature tube/valve, but with a hole in the middle of the socket to take
the seal-off tube of the CRT), a thin neck and a 11-12V heater. Most such
CRTs (of both flavours) have a 90 degree deflection angle.
If you can get a suitable tube of the same class (perhaps raid it from an
old terminal, like a VT3xx that's blown its flyback, or raid it from a
cheap portable B/W TV), it's likely to work. You may have to fiddle the
electrode voltages slightly, but in my experience, putting the CRT in,
fitting the original yoke (these are _not_ generic), and pluging in the
base and EHT cap will produce a useable image.
-tony