[time-nuts] Rpair of an 8662 HP Generator

[KA2WEU at aol.com]

Thanks
 
 
In a message dated 4/15/2016 10:02:01 P.M. Eastern Daylight Time,  
scmcgrath at gmail.com writes:

Silicon  investigations repairs them. Google the name for website

Content by  Scott
Typos by Siri

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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