Nothing is beyond repair.
Recenlty I had a Tek 475 which produced the magic smoke.
Found a burnt resistor but could not identify it on any of the circuit info.
Put it up on this site and got a few repllies
Some were very helpful but locating the component took time.
Turned out to be a Tant cap. replaced and also the burnt(magic smoke
generator.)
resistor
Scope works again.
It is surprising what can be recovered. No great experience in repairing
scopes
I have learnt .....ASK the questions. shame to throw these fantastic items
in the dumpster.
Here we do not have as much gear as you people in the States but sure
appreciate all your help
Thanks again guys.
Regards
Jim ( Ireland)
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On Sun, 1 Sep 2019 at 07:09, ¸é±ð²Ô¨¦±ð <k6fsb.1@...> wrote:
as much as I hate to say it...this is the mentality of most people
today...it breaks/does not work correctly toss it and go by a new one
and old stuff is no good.....what a loss...poor 465......
thank goodness this mentality does not apply to this wonderful group!
lets keep the good stuff running!
¸é±ð²Ô¨¦±ð
On 2019-08-31 3:15 p.m., Bob Albert via Groups.Io wrote:
The reverse Midas touch, apparently.
Geez, if something doesn't work and can't be fixed, it certainly offers
a wealth of recyclable parts.
Bob
On Saturday, August 31, 2019, 03:01:42 PM PDT, Raymond Domp Frank <
hewpatek@...> wrote:
What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a
good quality analog 'scope.
Without asking many questions, I showed him one of my 465's and he liked
it. He expressed some concern as to the reliability of these very old
instruments (I think this sample was from 1976/77). I told him that these
old 'scopes were still "more usable than unreliable", that some parts did
tend to fail from old age, especially the dipped tantalum caps but that
diagnosis and repair was straightforward, that I would take care of repair
for some time in the future for free and that I had an ample spare
components supply of all sorts should they be needed.
He was going to use the 'scope mainly for adjusting radio receivers and
was looking forward to the high vertical sensitivity, especially when using
a 1:1 probe. This should have been a warning for me but I limited myself to
explaining why the use of passive 1:1 probes cannot be recommended for some
of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of
the math.
We agreed on a price and he left, happy with his newly acquired classic,
or so I thought.
After a few days, he contacted me, asking for two knobs (A and B trigger
level), since apparently parts had broken off. I told him that I'd send
replacements for free.
Before I could send them, he contacted me, saying that the replacement
knobs were no longer needed since the 'scope had broken down: no beam, no
graticule illumination, no fan sound, and that he had concluded that his
'scope obviously was a total loss. He was sorry to tell me the bad news but
he had very much appreciated my explanations and service and he definitely
wouldn't want any money back. When I offered to repair the 'scope for free,
he added that that wouldn't be possible, since it was now in an underground
dumpster, inaccessible to him. He once again blamed himself for making the
mistake of buying such an old piece of equipment and we "parted as friends".
I still feel for the poor lonely instrument enveloped in darkness...
Raymond
.
