[Hallicrafters] SX-73 / R-274 Starting Resto

[WF2U]

The only problem I ever had with my R-274 a.k.a. SX-73, which I've owned for more than 20 years, was the shorted audio output tube cathode bypass "bathtub" electrolytic capacitor. The cathode resistor is within 10 percent of its rated value, so it couldn't have been subject to high voltage surge. The receiver is still working great, with no issues. Luckily, otherwise it is completely original and was never modified.

73, Meir WF2U
SC



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On Jan 1, 2018, 10:59 AM, at 10:59 AM, thoyer <thoyer1 at verizon.net> wrote:
>I'm getting ready to start working on an R-274 that I picked up this
>past
>fall. A quick survey of the internals shows that many of the capacitors
>show
>evidence of decay (cracking) and the resistors I did a quick
>measurements on
>are out of tolerance.
> 
>First order of business will be a complete disassembly and cleaning (it
>is
>pretty dirty and smelly.....). Then replace any out of spec parts,
>reassemble and see how it plays. It is mostly original from what I can
>tell
>with the exception of a replacement 455kc crystal.
> 
>Looking for advice from those who have "been there, done that" with one
>of
>these radios before. What should I look out for - what parts are
>typical
>troublemakers, etc.......
> 
>Just finished an overhaul on an R-390A that came out well and have been
>tinkering with these boat anchors for many years so I have some
>experience
>and a bunch of test equipment. Never been inside one if these so
>looking for
>advice.
> 
>Regards, 
> 
>Tom
>W3TA
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