[AMRadio] RE: Receiver update.

[Gary Schafer]

Hi Brett,

I haven't been in touch with the guy in some time. I will see if I can get
in touch with him. But I think that he used the "standard filter module"
which has a 10k input impedance and 100 ohm output impedance. You power it
from a diode and cap from the filament line. I believe that it can just be
put in place of an IF transformer. A 10 k plate load resistor should work
or drive it with the first IF transformer and the filter output to the
following grid.

You may want to give Kiwa a call. They can probably tell you exactly how to
hook them up.

This is the section for the standard module.
http://www.kiwa.com/kiwa455.html

73
Gary  K4FMX


Brett Gazdzinski wrote:

> Gary,
> I looked at the Kiwa web site, and the filters they have are for
> solid state stuff.
>
> Is the tube stuff different signal levels?
> I would think the tube stuff has signal voltages much higher
> than what you find in modern solid state stuff.
>
> Can you ask your friend how he actually did the filter thing?
>
> If the filters work, I can see where they could make some old receivers
> quite usable!
> If you can also find out if he used the LFH-4s (6kc) filter,
> or one of the filter modules with the amps inside, that would
> be helpful.
>
> With a filter replacing the 1st IF transformer, my receiver
> is going to be a very nice AM receiver indeed....
>
> Thanks for the offer of the Wilcox receiver.
> Sounds like you could get it working with a little work.
>
> Stuff like that is getting valuable, just for the parts inside.
> I think I will start looking for old junk at fests, just
> for parts like coils, coil forms, shield cans, tuning caps,
> dials, etc.
>
> Last year I picked up an old homebrew VFO for $20.00 at a fest,
> and it had a nice dial assembly, but it also had a bunch of the bigger
> slug tuned ceramic coil forms.
> I used one of them in my receiver as the ones that Antique Electronic
> supply sells are small.
>
> The dial alone would have gone for $50.00 on E bay, and
> the coil forms would have been $20.00 each!
>
>
>
> Thanks for the info and the offers,
>
> Brett
> N2DTS
>
> >
> >
> > Hi Brett,
> >
> > Here is a link to Kiwa filters. A friend of mine put one in a
> > hamarlund
> > receiver. Said it worked great. Price is much less than some
> > mechanical
> > filters.
> >
> > http://www.kiwa.com/
> >
> > If you are interested I have an old Wilcox model CW3
> > receiver. It is single
> > channel crystal controlled. Uses plug in coils to change
> > bands. It is rack
> > panel about 3 1/2 inches high. Tubes and coils are mounted
> > laying down. Uses
> > tubes like 6sn7, 6K8 etc. Has 3 large IF cans about 1 1/2
> > inches square by 4
> > inches tall. I think 455 kc but not sure. Also has power
> > supply built in. I do
> > not have any of the plug in coils or crystal. (all octal
> > sockets) All the rest
> > is there.  It is yours if you can use it.
> >
> > 73
> > Gary  K4FMX
>
> _______________________________________________
> AMRadio mailing list
> AMRadio at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/amradio