[Hammarlund] HQ-180 no sensitivity and block bias question

[Guido Santacana]

Small straight and curved hemostats will do wonders in those tight places.
They helped a lot when I had to do one IF can of my HQ180A.

Best 73s

Guido

Guido Santacana KP4FAR

On Sun, Nov 13, 2016 at 10:24 PM, Jeff <jeff at podengo.com> wrote:

> Hey Al -
>
> Yep. I wrote too soon.  In looking at the 180 schematic, it says "330" in
> each coil.  I'm going to assume that's the capacitor value: 330 pF.
>
> I was able to drill the ferrule out of the bottom of the can without
> mangling the coil - only broke one coil wire!  I used hot glue to seal
> everything back up again.  Not as bad as I thought it was going to be, but
> I'd prefer not to have to do any more of them if I can help it.  Nothing to
> fear as long as you have a steady hand and good magnifier light.
>
> Now the trick will be to get it all reinstalled.  The bandwidth/sideband
> selector switches don't make it easy to work in that part of the rig.
>
> Thanks!
>
> Jeff
>
>
>
>
>
> On 11/13/2016 7:16 PM, Al Parker wrote:
>
>> Hi Jeff,
>>     I've done the job on an HQ-170.  Can't find my pix & info on it right
>> now, but I used a Dremel tool to dig out the old caps, at least on the ones
>> next to the edge of the chassis without can removal.  I'm pretty sure that
>> one of the manuals for the 170 or 180 does show the values of those caps in
>> the cans.  If you can't come up with it, let me know,I'll do some more
>> digging.
>> 73,
>>
>> Al, W8UT
>> www.boatanchors.org
>> www.hammarlund.info
>>
>> "There is nothing -- absolutely nothing -- half so much
>> worth doing as simply messing about in boats"
>> Ratty, to Mole
>>
>> On 11/13/2016 4:44 PM, Jeff wrote:
>>
>>> An update...
>>>
>>> Silver Mica Disease on T-3 (and probably T-4 and T-5 - the 455 KC IF
>>> transformers.)
>>>
>>> Does anyone have any suggestions as to the value of capacitor to shunt
>>> across the transformers if I'm successful in removing the old mica
>>> sheets from the cans themselves?  I've watched a few videos of the
>>> process -- it looks pretty intimidating, but I'm willing to give it a
>>> try.  Plenty of space to mount something on the underside.
>>>
>>> Thanks all.
>>>
>>>
>>> On 11/11/2016 7:50 PM, Jeff wrote:,snip>
>>>
>>
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