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

[Jeff]

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>