[Hammarlund] HX-500 LV choke

[Jeff]

thanks to all that provided advice.

Got a new problem I need to track down now... most of the resistors in 
the rig are at least 15-20% out of tolerance (that's figuring that most 
of them are 10%ers anyways...)

So in working through it, I did about a half dozen replacements, turned 
it on and as soon as things started to conduct, I toasted R19 (300 volts 
to the plate of V3A - first mixer).  It's a 1K 1/4 watt according to the 
schematic, but it looks like someone cobbled a really awful solder job 
on a replacement component.

So now I'm dead in the water -- gone through the schematic, retraced all 
my steps and everything seems to be hooked up correctly with the right 
value replacement resistors.

Gotta quit for the day, but any insights from those who have one of 
these would be most appreciated.

--jeff


On 1/22/2017 2:53 PM, Jeff wrote:
> All -  Continuing to troubleshoot the HX-500.  Making a bit of 
> progress and finding lots of out of tolerance resistors.
>
> It seems however that the LV choke (pn 26302) in the rig is running 
> quite hot -- so much that it's uncomfortable to put your hand on the 
> frame (I tested it first for voltage there... hi hi).
>
> I'm assuming that kind of heat probably isn't normal -- and possibly 
> could explain the higher than normal voltage coming out of the LV 
> power supply section?
>
> Anyways, I'm inclined to replace it with something "new", like a 
> Hammond 157M which has the same inductance and series resistance as 
> the original choke ( 8 Hy and 250 ohms).  The 157 is only rated at 100 
> mA though.
>
> Might anyone have a suggestion as to a replacement, short of having 
> the original rewound?
>
> Thanks!
>
> Jeff
>
> WB3JIH
>
>
>
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