[Hammarlund] HQ-180 hum in CW mode

[barcand at nccray.com]

Of course there is a 3rd option.  Order an exact new replacement
multi-section can electrolytic from Hayseed Hamfest (google it) and do a
new replacement. Less work than a re-stuff, cleaner looking than
under-chassis added caps, but this also will diminish the "original look"
if you are striving for that aspect. Just a suggestion.

Bernie in ND
WD0GMD


On Fri, November 28, 2014 12:03 pm, Charles Ochs wrote:
> Sounds to me that you are "closing in" on the problem. A failing filter
> cap will often be more audible as the 60 HZ content of the B+ will beat
> against the steady tone of a CW signal.Troubleshooting should ALWAYS start
> with the power supply. Can capacitors should ALWAYS be considered
> "suspects" and must be carefully eliminated before proceeding onward to
> other things. Without a healthy power supply, the radio can not be
> expected to operate properly.Given the age of the HQ-180, it should be
> assumed that if these caps are not bad now, they will be shortly--so just
> replace them. The preferred method--used by all "professional"
> re-builders, is to remove the can, and re-stuff it with individual
> electrolytics. This is tricky surgery but will result in a receiver that
> both works properly, as well as preserving original under-chassis
> appearance.If you don't care about appearance, or future resale value, you
> can always cobble in some clutter of terminal strips and individual
> electroly
>  tics. This is up to you. In either case, you will have eliminated one of
> the main trouble spots.
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>