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<p>My replacement power supply came in this morning. I am no longer
scope-negative!<br>
</p>
<div class="moz-cite-prefix">On 3/17/2019 5:25 PM, Adam Inglis
wrote:<br>
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<blockquote type="cite"
cite="mid:E47D605B-E384-4170-A2CB-C2785BB6CA6F@tpg.com.au">
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<div class="">On 18 Mar 2019, at 9:56 AM, Brian Willoughby
<<a href="mailto:brianw@audiobanshee.com" class=""
moz-do-not-send="true">brianw@audiobanshee.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><span style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-stroke-width: 0px; float: none; display:
inline !important;" class="">I think it’s kinda funny,
because sometimes I repair vintage synths for local
musicians, but I have to look to someone else to get my
‘scope repaired.</span></div>
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<div class="">I’ve recently finished repairing a 50 year old CRO.
There were a variety of (mostly power related problems) but the
area that really stumped me was the high voltage circuit for the
CRT itself. I had no experience with this type of circuit and no
way of testing the high voltages. I made a divide-by-10 test
probe, took a voltage measurement at virtually every point on
the schematic and muddled through, ended up virtually rebuilding
the entire HT circuits either side of the coils, and eventually
got those electrons hitting the screen in a coherent way. Took a
couple of years between all the other jobs….</div>
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<div class="">Adam</div>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
--Tim Ressel
Circuit Abbey
<a class="moz-txt-link-abbreviated" href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a></pre>
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