More for Bernie on SB102

[W5EUQ]

Yep you are absolutely right Ken. Your summary is very thorough. 

Bernie, Ken will find something when he goes through the manual that 
will help you fix it... _just hang in there...AND keep looking in the 
meantime.   _grin, grin.

Ken mentioned the freqs of something possibly being off.... have you 
checked the Xtals freqs to see if they are at least near the proper 
freqs.  _AND _I still suspect the switches as they get so oxidized and 
make "terrible contact".  Cleaning with Deoxit , and not that spray 
cleaner stuff, will really help here.  I've awaken many circuits by 
cleaning the switches.

Like I said though, you've gotta let us know what you find or we'll pull 
your Heath List Server plug.... HI....  
Bob  PS... it's dinner time and pool time again... checking back later 
tonight.

Kenneth G. Gordon wrote:
> On 3 Oct 2006 at 19:37, W5EUQ wrote:
>
>   
>> One thing that concerns me is that Bernie says he's performed the
>> alignment fastidiously(spelling?) and feels it has to be something
>> else.  This is one may be one of those "dogs" that one gets and has
>> real problems finding the problems.
>>     
>
> You know, Robert, you are one fine fellow! :-)
>
> I agree with you: I think there is something ELSE wrong. Some 
> component has failed, or there is a wiring error that he hasn't yet 
> caught, but in any case, it isn't one of the  normal problems we have all 
> experienced.
>
> Let me review: 
>
> 1) Bernie has good output and sensitivity on all bands EXCEPT 40.
>
> 2) On 40, both sensitivity and output are down.
>
> 3) He has performed the alignment procedure fastidiously (as you 
> correctly spelled it), more than once, and nothing changed.
>
> 4) He has checked all tubes and replaced the doubtful ones.
>
> 5) His heterodyne oscillator alignment seems to be correct.
>
> 6) Wasn't there also some sort of problem with 80? Low output?
>
> Hmmmm....I will study my SB-102 manual and schematic to see if I can 
> suggest any course of action to follow.
>
> It IS possible that one or the other of the 40 meter driver/preselector 
> coils has been damaged somehow. Perhaps a shorted turn. But it would 
> seem to me that this sort of damage would show up in the alignment 
> procedure since adjusting the slug wouldn't show a good, sharp peak.
>
> One other thing I think I would do is to carefully check the frequencies 
> of both the heterodyne oscillator output, and those around the 6CL6 
> driver.
>
> It is also possible that something is operating at 1/2 the correct 
> frequency and some OTHER stage is doubling when it should be 
> operating straight through.
>
> There also may be a bandswitch wiring error that has gone unnoticed.
>
> Ken Gordon W7EKB
>
>
>   

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html