[Boatanchors] BC-1004 / BC-779

[Mark Foltarz]

Its a pretty good radio. I enjoy the one I just refurbed and have another one
awaiting the same.

There are a couple of paper caps in the cans as in the BFO, and if I recall
correctly, the crystal filter.

Be advised that the crystal filter can section is a fairly time consuming
component to remove, refurbish and replace. Be real patient with the phasing
shaft. Mine was broken when I got it but it was fairly easy to make a new one
out of  plastic rod.  

The audio output section was pretty screwed up since both the intertage and
output transformers had trouble.  I ditched the three 6F6s in lieu of a 6SN7
driving a pair of 6V6 to an 8 ohm output. Sounds good now.

de KA4JVY

Mark


--- Al Parker <anchor at ec.rr.com> wrote:

> hi agn Phil,
>     As I'm sure you are aware, the BC-1004 is pretty much the same as the
> BC-779, -774, and R-129, (SP-200 series) except for band coverage.
> Probably closest to the BC-779 where it's only different in the lowest 2
> bands' freq. coverage, 540 - 1160kc, and 1160 - 2500kc for the 1004 vs
> 100 - 200kc and 200 -400kc in the 779.
>     They're covered in T.O. 31R1-3BC779-1  (TM11-866), which is avaliable
> for free download on The Hammarlund Historian website's "Manual" section.
> (thanks to John, K5MO, for the scanning chores)
>     There's also a reburbishment page on the BC-779 in the "Service"
> section.  I don't remember any particular "gotchas" in it, but all the
> paper caps will need to be replaced, and check the bleeder/dropping
> resistors in teh power supply.  It is a very nice operating receiver when
> done.
> http://www.hammarlund.info
>     I don't know why there might be a reason to change the HFO from a 6J7
> to a 6C4 other than to update or go miniature.  There was a long article
> in QST back in the 50's or early 60's that went thru a complete re-tube
> and redesign to "modernize" these rcvrs.  THat may be where the swap came
> from.  I have a copy, & can send you a copy it you'd like.  I don't think
> it's on the website due to copyright worries.
>     We'll all be interested in the account of your progress as you get
> into it.
> 73,
> Al, W8UT
> New Bern, NC
> BoatAnchors appreciated here
> http://www.thecompendium.net/radio/
> http://www.hammarlund.info
> 
> 
> ----- Original Message ----- 
> From: "Philip B Atchley" <ko6bb at juno.com>
> To: <boatanchors at mailman.qth.net>
> Sent: Wednesday, August 18, 2004 11:02 PM
> Subject: [Boatanchors] BC-1004
> 
> 
> > Hi All,
> > The owner picked up his overhauled R-100/URR today and dropped off a
> > BC-1004 for a re-cap and general servicing.  It looks like an
> interesting
> > old radio, the power supply is nearly as big as the receiver and is
> > considerably heavier!  It must have been made when the price of iron was
> > down ;-)  This is NOT the set you'd want to use as a backpack rig for
> > field day.
> >
> > For some reason somebody made a socket adapter and replaced the HFO
> VT-90
> > tube (Pentode?) with a 6C4 7 pinner.  Not sure why that was done, but it
> > looks like it won't be too hard to reverse it.
> >
> > Any "Gotcha's" on this set?
> >
> > 73 from the "Beaconeers Lair".
> > Phil, KO6BB
> >
> > Where DX begins at the noise floor!
> > Merced, Central California, 37.3N  120.48W  CM97sh
> >
> 
> 
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> ** List Administrator - Duane Fischer, W8DBF/W9WZE **   
> ** For Assistance: dfischer at usol.com **         
> $$ For vintage radio info, see the HCI web site $$      
> http://www.w9wze.org    
> 
> 



		
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