[Hammarlund] SP-600 waveform after cap change

[stbradford]

Rodger wrote:
> Hi,
>
> Due to email problems I missed your earlier postings but where are 
> you  measuring the waveform?  If you haven't done so already I would 
> pull V-12 and measure at pin 1 of its socket to see the waveform there 
> in case it is the buffer stage distorting the output.  Also check the 
> value of R-75 if you  haven't changed it already.
>
> 73, Rodger WQ9E
>
> stbradford wrote:
>> Well I just finished the repairs and fired up the SP-600. I didn't go 
>> backwards but the results were the same. Same waveform and poor cw 
>> reception audio quality. I am going to have a beer and think about 
>> what to do if anything...
>>
>> Here is a link to the photos of the reworked BFO. As you can see it's 
>> identical for all practical purposes...
>>
>> http://home.insightbb.com/~w9hak/index.htm
>>
>> Smith Bradford
>> W9HAK
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>
>
Hi Roger

 I sure did check at the buffer g1 and it looked just like you see it. 
The plate of the buffer looks much cleaner.
The dual trace picture has the buffer plate on the lower trace. Mine 
also looks like that trace from Al's SP-600.

The am portion of the radio sounds great, I will check the buffer b+ and 
screen decoupling caps but don't expect to find anything. This was a 
last production JX17 and has all ceramic caps through the receiver. 
Thank goodness..............

Smith
W9HAK