[Hammarlund] SP-600 waveform after cap change

[stbradford]

Jim Wilhite wrote:
> What does the waveform look like if you disconnect the BFO from its load?
>
> Could there be a problem in the stage the BFO is hooked to or the BFO 
> is too tightly coupled?
>
> Jim/W5JO
>
>
>
>
>
>> 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
>
>
The wave forms can be viewed 
at...............http://home.insightbb.com/~w9hak/index.htm..............

I have looked at the bfo output at the g1 grid of the buffer with the 
buffer tube removed. Looks just like the output of the bfo oscillator 
where it enters the miniature coax. The unit is just as Hammarlund 
delivered it to the Air Force. The wave form improves at the plate of 
the buffer due to the inductive load. You can see the wave forms at the 
above web site.

Smith
W9HAK