[time-nuts] Rpair of an 8662 HP Generator

[KA2WEU at aol.com]

The problem is solved, A German surplus dealer has/had bunch of these  
generator, calibrated and with guarantee for less then $ 3000. And in good  
shape. 
 
Who wants  the old one .. no cost , power supply in trouble , Ulrich 
 
 
In a message dated 4/15/2016 10:01:56 P.M. Eastern Daylight Time,  
time-nuts at febo.com writes:

Thanks,  I do not have a repair manual and I hate to abandon the signal   
generator after man years of positive use... Ulrich  


In a  message dated 4/15/2016 9:14:21 P.M. Eastern Daylight Time,   
paulswedb at gmail.com writes:


Ulrich
To  your first  question I am unaware of anyone that repairs them. Though 
there are   many places that might, typical cal and repair shops. I have a 
sick 
8662  also  (age) and need to dig in. At least I know the board and the 
most  
likely issue.  The yahoo user group has a lot of useful  details.
Regards
Paul
WB8TSL






On Fri, Apr  15, 2016 at 7:08 PM, Dr. Ulrich Rohde via  time-nuts  
<_time-nuts at febo.com_ (mailto:time-nuts at febo.com) >  wrote:

Thanks

Sent  from my iPhone


On Apr 15,  2016, at 6:38 PM, "John Miles" <_john at miles.io_ 
(mailto: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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