[vcf-midatlantic] Museum report: terminals
hjohnson at retrotechnology.info
Mon Jul 9 14:23:43 EDT 2018
On 7/9/2018 1:04 PM, Evan Koblentz wrote:
>> Well, Evan asked me to come in on Sunday, to review the terminals and
>> inventory them. ...I'll send Evan a more detailed report, but he has the list and
>> location-of information I compiled Sunday.
> We definitely picked the right person for this job! Thanks again Herb
> for the detailed report you gave me yesterday.
To be clear, I gave Evan on Sunday a list of terminals and shelf
locations. Today he got my detailed report by email, and my comments as
Jonathan Gevaryahu wrote:
> These CRT tubes don't have to be replaced, the CRTs can be very
> carefully heatgunned to remove the front protective glass cover and
> scrape out the 'cataract' goo. I think Ian has done it to a few of them
Ethan Dicks also described this process. Also here's where someone
describe it to me:
I'll be blunt to be brief. A heatgun on a messy, gooey, HOT, CRT is too
dangerous and takes too long, in my opinion. I won't do it. Ian and
others may do such things. "There are old pilots, there are bold pilots,
but there aren't many old, bold pilots."
Private email to me:
> Hey Herb: where can one get replacement CRTs for "tens of dollars"?
> I'm looking to repair an H19 that is otherwise in good shape but
> the CRT seems to be bad. Tx.
Rebuilt CRT's for common CRT's say 12-inch, seem to be under $100, maybe
well under. Try
Used CRT's, say salvaged from other computers, are less. About "bad",
you weren't specific. Heath H89's and H19's use the same CRT. (Zenith
Z89, Z19), so look for another unit. I have extra Heath CRT's, I'll get
back to ya on that.
But the common problem with those models, is poor contact at the CRT
socket and pins for the high-current filament. See if the filament is
"lit", if not see if wriggling the socket changes your results. YOu can
tell me privately about other CRT problems.
Herb "Cathode Ray" Johnson
Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
preserve, recover, restore 1970's computing
email: hjohnson AT retrotechnology DOT com
or try later herbjohnson AT retrotechnology DOT info
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