[ARC5] BC-779 mods

[Bill Fuqua]

The two RF amplifiers were much better at reducing images since it had a 
455kHz IF.
have a couple myself.
Bill wa4lav


At 08:49 PM 10/21/2012 -0700, Kenneth G. Gordon wrote:
>On 21 Oct 2012 at 18:45, Richard Knoppow wrote:
>
> >     My main experience with modifications was my BC-779.
> > When I got it I found that the RF section had been modified
> > according to a CQ article.
>
>Yes. I have that article "The Ultimate Super Pro". Ye gods, what an abortion.
>I have a completed example of that thing. I bought it, along with an
>untouched one, from a fellow some time ago.
>
> > About the only really
> > useful mod was to add a voltage regulator to the oscillator
> > and _that_ was not in the article.
>
>Hammarlund some time later recommended soldering a 3 pfd N-750 cap
>directly across the oscillator section of the tuning cap. Made a BIG 
>difference
>in stability.
>
> > Unmodified the receiver
> > works very well other than using rather noisy tubes for RF
> > amps and mixer.
>
>Actually, in my experience with my NIB BC-779 back in the late 1960s,
>changing the detector to a single-triode product detector made a MAJOR
>difference.
>
>That receiver has two RF stages, and there is plenty enough gain to mask
>the mixer and RF amp noise.
>
> >I still have this receiver but I think
> > now it needs all new caps.
>
>Probably does.
>
>I think I have at least 3 BC-779s here. One is complete and untouched,
>another was the unfortunate subject of that CQ mag article I mentioned
>above (complete with hacked out audio section), and the third one, although
>pretty much complete, is really good for nothing but parts...I think. At 
>least it
>is pretty ugly looking...we'll see just how bad it is when I can get to it.
>
>Ken W7EKB
>______________________________________________________________
>ARC5 mailing list
>Home: http://mailman.qth.net/mailman/listinfo/arc5
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:ARC5 at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html