[Hammarlund] HX-50 snapping noise

[Robert Sauvan]

Yes,
You are correct. 162 A B and C.I replaced 162 A first. All worked as 
usual. I then replaced 162 C next. This is when it all went south. I 
replaced that cap before 162 B only due to layout issues to make it look 
nicer under the chassis and access to wires. Each time I replaced each 
cap of course I left the other ones hooked to the old can until I got to 
them in the next step. Hope this helps. I have been doing some reading 
on how to troubleshoot now that it is very problematic. I read that I 
could pull the power tube and the rectifier tube and turn it on again 
and see if it blows fuses. This might check to see if my 6DQ5 or 
rectifier might have been the problem. Im sure all of you will know 
better and am hoping for your suggestions.

Thanks Bill

Bob-W0YBS


On 7/10/2014 9:03 PM, Bill Cromwell wrote:
> Hi Bob,
>
> I pulled up the schematic on BAMA and looked it over. I see only one 
> multisection cap - C-162A and B. Your description can be interpretted 
> several ways. apparently that replacement was succesful. So which of 
> those last caps was the one that failed? Which caps were the last 
> three caps? With that information maybe we can help.
>
> 73,
>
> Bill  KU8H
>
>
> On 07/10/2014 09:13 PM, Robert Sauvan wrote:
>> Hi all,
>> As many of you might remember, I have been working on my HX-50 
>> transmitter. It  all started with a major chirp. In the process I 
>> started recapping the rig. Each time I replaced a cap I turned on the 
>> rig to be sure all is well. It all worked great up until I got to the 
>> last multi-can cap setup.During this process I kept hearing a 
>> snapping noise occasionally. I occasionally heard the snapping noise 
>> before recapping as well but it wanst real bad, but I knew something 
>> was up.I couldnt actually pin point the snapping noise and pretty 
>> much was hoping it was one of the electrolytics. It was faint but 
>> there. So, I started replacing the last 3 caps one at a time. I was 
>> mounting them individually under the chassis and not replacing the 
>> multi-cap can because I couldnt find one. The first cap went fine. 
>> Was getting the usual output on the rig but I was still hearing the 
>> snapping noise. Went to the 2nd cap and then everything went to pot. 
>> I fired up the rig and keyed it liked I did on all previous testing 
>> but I noticed not quite the output as before and then the rig hummed 
>> and blew the fuse. Im sure I have everything hooked up correctly so 
>> Im thinking the transformer was what was making the snapping noise 
>> previously and now I blew it. Any ideas? Did I trash the thing? I 
>> hooked the old electrolytic back up but I think it was too late now 
>> since I think I trashed the thing. Any ideas?
>>
>> Thanks-Bob-W0YBS
>
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