[Hammarlund] HX-50 problem cropping up

[Robert Sauvan]

Well Bill,
I have just been down fiddling with the rig and after swapping an 
swr/power meter I found that I do have power output. But it seems my 
issue looks to be related to my RF Drive control. It is not doing 
anything and as a result I am not able to adjust the PA Cathode current 
which is probably related to the fact that I didnt see power output at 
times.I am going to go back through the tubes again. But I think I have 
exhausted that as a fix.

Bob-W0YBS


On 1/13/2015 5:47 PM, Bill Stewart wrote:
> Ok Bob...I just went thru the 'no power' problem the
> last few days. In my case, I was going thru my stock
> of 6AU6s...and variants, looking for a vfo tube that
> might help the note. Some of them would not osc and
> therefore no output. I guess you have cked the +/-
> 6 mc vfo output freq. for a vfo sig. The vfo tube I
> am now using is a 6AH6-WA. I expect you have tried
> other vfo tubes. Man, this thing is pretty complex.
> I'm more used to the little Novice rigs...hi.
> GL...73 de Bill K4JYS
>
> ----- Original Message -----
> From: "Robert Sauvan" <rsauvan at beyondbb.com>
> To: "Bill Stewart" <cwopr at embarqmail.com>
> Cc: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
> Sent: Tuesday, January 13, 2015 7:30:20 PM
> Subject: Re: [Hammarlund] HX-50 problem cropping up
>
> Hi Bill,
> I did get some replies back and good bit of help as well. But, have not
> been able to find the problem yet. I am having some serious relay issues
> pulling in when they shouldnt. In the midst of it all I have now found
> that I no longer have any power output so it seems another issue has
> popped up. I am going to try to find out why I dont have power anymore
> and then back to the original problem I hope. Will keep everyone
> informed of the progress.
>
> Thanks-Bob-W0YBS
>
>
> On 1/13/2015 3:29 PM, Bill Stewart wrote:
>> Hi Bob,
>> I didn't see any replies to your questions.
>> Sorry, but no good suggestions. I did want to let you
>> know that I am also having a problem with the VOX
>> system. On my HX-50, MOX and SSB VOX work ok, but
>> on CW VOX, at the tap of the key the relays pull in,
>> but will not unkey...no matter where the delay is
>> set. I can manually unkey the relays by prying the
>> contacts up...but seems to only take very slight
>> pressure to do this...not like when they are pulled
>> in, say in MOX. Do you know how the VOX delay for CW
>> works...components, etc? I was thinking that R-149B
>> and the .22uf (C239)formed a RC timing ckt to control
>> the delay. There seems to be more to it than that...I'm
>> having trouble following the schem. thru all the wafer
>> switches...hi. Good luck with your HX-50. If you find a
>> fix for your problems, please pass it along...I would be
>> very interested. The tone on mine has not sounded very
>> good, but with changing a few tubes, it sounds a bit
>> better...but not as good as I would think a $500 xmtr
>> would have sounded when it was new.
>>
>> 73 de Bill K4JYS
>>
>> ----- Original Message -----
>> From: "Robert Sauvan" <rsauvan at beyondbb.com>
>> To: "Hammarlund Mail List" <hammarlund at mailman.qth.net>
>> Sent: Thursday, January 8, 2015 9:57:45 PM
>> Subject: [Hammarlund] HX-50 problem cropping up
>>
>> Hi all,
>> As you may remember, I just replaced my electrolytics and the power
>> transformer in an attempt to resolve the chirping issue in my HX-50.
>> This was back in June and the radio has been working fine ever since
>> until just the other day. I now have a new problem. When I turn on the
>> radio now, I leave it it "standby" until I am ready to transmit. But,
>> now when I put it in "Mox" or "Vox" it goes into transmit and shows
>> power output on my power meter. The key seems to be ineffective. I do
>> not use a microphone. I have it on the workbench and noticed a couple of
>> times some sparking at the relays K101/102. I cleaned the relays well
>> again but no change. I also notice that the contacts on the relay are
>> floating. No change when I put it in mox or vox. I am assuming, but
>> shouldnt the relays be closed at some point? Either sitting at idle and
>> then when it is either keyed or put in vox, they should click into
>> another position? Any ideas where I might start looking? Im wondering if
>> the relays are bad. I have tapped them a couple of times thinking they
>> may be hanging up but that doesnt seem to have any effect. Any
>> suggestions would be great.
>>
>> Thanks-Bob-W0YBS
>> ______________________________________________________________
>> 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
>>
>