[time-nuts] Rpair of an 8662 HP Generator
Dr. Ulrich Rohde
ka2weu at aol.com
Fri Apr 15 23:08:26 UTC 2016
Thanks
Sent from my iPhone
On Apr 15, 2016, at 6:38 PM, "John Miles" <john at miles.io> wrote:
>> My signal generator has a poor, intermittent power supply. The RF
>> section is ok. Who can please tell me which company can and will fix these
>> older
>> but excellent generators?
>>
>> Thanks, Ulrich
>
> Have a look at the capacitors in the voltage divider that drives the bases of the switching transistors. There's a good chance that's your problem, and they probably need to be replaced even if not. 75-TVA1607 (Mouser p/n for Sprague TVA1607) works well.
>
> It would be nice to use 105C parts if you can find some, but the 85C TVA1607s have worked well for me in multiple 8662As over several years.
>
> The other likely suspect is one of the large screw-terminal electrolytics on the motherboard. The power supply can almost-but-not-quite start up when one of those is completely open. High ESR is very likely to cause intermittent operation.
>
> -- john, KE5FX
> Miles Design LLC
>
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