[ARC5] Transistorized ARC-5 Receiver

[Dennis Monticelli]

JFETs are readily available.  I have seen dual gate MOSFETs NOS from Dan's
Small Parts.  I'm sure there are other sources.  You can make a dual gate
JFET by stacking a higher Vp part in cascode over a lower Vp part.  Biasing
would be different that the MOSFET version but similar function.

I will close with reporting that the BC-453 works fine as-is battery
operated.  The filaments are not so hungry as to prevent a night of
listening in the field via a gel cell (12V conversion).  B+ is a stack of
seven 9V batteries in my case.  I have taken such a config to the field and
it works great.  Alternatively you can stack two gels for filament and run
the B+ off the 28V too.  Gain would be lower and the osc may or may not
reliably start (try different tubes).  There is a simple reversible screen
divider mod that helps with B+ that low.

Dennis AE6C



On Sun, Jan 1, 2017 at 9:26 AM, MICHAEL ST ANGELO <mstangelo at comcast.net>
wrote:

> Actually it is a good way to resurrect a gutted receive or a set missing
> tubes. Since you have to replace the capacitors you may explore the solid
> state option.
>
> I am a longtime LF listener. In the 1970's I was looking for a battery
> powered receiver to listen to the LF band. I rebuilt a BC-453 with solid
> state devices.
>
> I used JFETS's in the RF, oscillator and BFO stages and Dual Gate MOSFET's
> in the mixer and IF stages. I forgot what I used in the detector and audio
> stages. It was an excellent receiver with very low power consumption. I
> operated it form 12 volts.
>
> I was going to built solid state converters for the ham bands but college,
> employment got in the way.
>
> I referenced an article in QST or Ham Radio about a solid state conversion
> in a BC-348 for my design. If I find the article I will post the
> information.
>
> JFETS are still available but it may be difficult to find Dual Gate
> MOSFETS. I believe some Dual GAte devices are available in SMT packages.
>
> Happy New Year,
>
> Mike N2MS
>
> > On December 31, 2016 at 8:50 PM Phillip Carpenter <carpenterpa at tds.net>
> wrote:
> >
> >
> > I just want to read the article...
> >
> > Phillip
> >
> > Sent from my iPhone
> >
> > > On Dec 31, 2016, at 8:22 PM, Bob Moody <bob at vanirmail.com> wrote:
> > >
> > > Isn't that like putting a smog pump on a Model A?
> > >
> > > K7IRK
> > >
> > >
> > >
> > > ----- Original Message ----- From: "Phillip Carpenter" <
> carpenterpa at tds.net>
> > > To: <arc5 at mailman.qth.net>
> > > Sent: Saturday, December 31, 2016 3:48 PM
> > > Subject: [ARC5] Transistorized ARC-5 Receiver
> > >
> > >
> > >> Does anyone on the Forum know the correct citation for an article
> that describes how to transistorize the Command BC-45x series receivers?
> > >>
> > >> It is thought that the article appeared in Short Wave or RadCom
> magazines or perhaps one of the other radio journals back in the late 1960s
> or 1970s.
> > >>
> > >> Thank you in advance to all who reply!
> > >>
> > >> Respectfully,
> > >>
> > >> Phillip W4RTX
> > >>
> > >> Sent from my iPhone
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