[time-nuts] Rpair of an 8662 HP Generator

Rob Sherwood. rob at nc0b.com
Sat Apr 16 02:53:09 UTC 2016


With the improvement in the top radios today, it is no longer possible to test them with my 8662A / 8663A generators.  I have had to move to 8642A / 8642B. However for more general sig gen needs, I prefer the 8662A.

Rob
NC0B

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of KA2WEU--- via time-nuts
Sent: Friday, April 15, 2016 7:26 PM
To: paulswedb at gmail.com; time-nuts at febo.com
Subject: Re: [time-nuts] Rpair of an 8662 HP Generator



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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