[Milsurplus] BC-474 Info

[B. Smith]

     The BC-474 is a great set for display at military meets and 
rallies. Visitors enjoy tuning the receiver  and listening to various 
"short wave" transmissions.  The set used in  conjunction with a BC-611 
gives the visitors a real feel  for WWII communication.

    Transmitter Operation on 40 meters can simply be done by changing 
the padding capacitor  C2 (100 pf) on the rear of the main tuning 
capacitor C18.  For the low end of 40 meters I used a 75 pf.   The 
receiver can easily be moved up by tuning T6. Yes the calibration scale 
will be effected  but I just simply use a pencil mark on the dial. All 
easily changed back to original. Improvise-Adapt- Overcome.

The main problem with the set is powering it up especially in the field. 
I've addressed this problem and discussed various ways of providing the 
"proper" receiver bias including utilizing  a small 9 volt battery.   :-)

http://k4che.com/BC474power/BC474%20Power.htm

The BA-48 battery can be substituted and used on the receiver and this 
of course solves the "bias" problem. Fair radio has depleted batteries 
and they are very easy to rebuild.

http://k4che.com/BA48/BA48pg1.htm

Since I do not have a GN-44 I often set up an use a GN-45 hand crank 
generator for display, it works fine but requires some minor easily 
reversible wiring mods.  Looks the same, smells the same, and works the 
same. Visitors enjoy cranking the generator and hearing the set come to  
life.  And yes the B minus ground has to be lifted - details can be 
found at:

http://k4che.com/GN-45/GN-45.htm

Detail of the correct telegraph key  and some photos by Dave AB5S can be 
found at:

http://k4che.com/GN-45/GN-45.htm

Photos of my BC-474 ops at Fort Miles Delaware can be found at:

http://k4che.com/FtMiles2015/Ftmiles2015.htm

Its a great set and the best part is you can lift it.    :-)

73 k4che