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Title: Help- SX 28A Component (R &C) Locations Post by: Carl WA1KPD on February 22, 2017, 02:15:47 PM I really need a chart showing the location of individual resistors and capacitors in an SX-28A. I'm willing to pay for one.
I have the military version of the SX-28A which means that it has been all sprayed with varnish, making parts and in particular and cable bundles very difficult to trace. I have not been able to find any diagram that shows for example where R34, or C5 is physically located. I can find some parts that go directly to a tube or switch, but other times they go off to tie points and then tightly laced cables were everything is varnish color. Web searches have not turned up anything. Specifically I really need to find R58, 59,and 60 . (AVC circuit) There are others but I'll hold off for now.... Thanks Carl Title: Re: Help- SX 28A Component (R &C) Locations Post by: WD8BIL on February 22, 2017, 02:38:51 PM Hi Carl..... what documentation do you have?
These resistors are in the cathode circuit of V8 (6B8) Title: Re: Help- SX 28A Component (R &C) Locations Post by: N8ETQ on February 22, 2017, 03:04:50 PM They May be gone... check this out.. http://bama.edebris.com/manuals/hallicra/sx28servicebul/ GL /Dan Title: Re: Help- SX 28A Component (R &C) Locations Post by: Carl WA1KPD on February 22, 2017, 03:34:53 PM Hi Julius and Dan, AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Julius, I have a copy of the SX-28 manual from BAMA and the military manual for the AN-GRR2 (Military SX-28A) which at least has a resistance chart. But with the varnish and tight cable bundling it is very difficult to trace anything unless it goes directly to a tube socket. Even most resistors have no useful color coding as they two were varnished 75 years ago Some resistors I can psych out as being good, by tracing the schematic and finding 2 points unaffected by other items that allow me to test. But as we all know components are often not near a logical spot ;D. Dan, I checked that service bulletin, but it does not list any component locations. Thanks to you both |