[sdiy] [OT] My Scope Saga

Tim Ressel timr at circuitabbey.com
Thu Mar 21 19:42:15 CET 2019


My replacement power supply came in this morning. I am no longer 
scope-negative!

On 3/17/2019 5:25 PM, Adam Inglis wrote:
>
>> On 18 Mar 2019, at 9:56 AM, Brian Willoughby <brianw at audiobanshee.com 
>> <mailto:brianw at audiobanshee.com>> wrote:
>>
>> 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.
>
>
> 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….
>
> Adam
>
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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