[Hallicrafters] Solid state rectifier and matching 6V6s

[Glen Zook]

Considering the cost of copper wire these days using a
filament transformer in a voltage "bucking" type
circuit will generally be much cheaper.  Remember that
the price of copper has gone up over 300% in the past
year, or so.

>From Mouser 18 gauge "zip" cord runs $342.71 for 1000
feet (no shorter lengths available).  Part number
566-8888-1000-08 (Belden part number 8888).  However,
no 3rd wire ground is present with such wire and you
have to provide the ground for safety.

Radio Shack sells a 3 amp 12.6 volt transformer for
$10.49 (part number 273-1511) and a 1.2 amp 12.6 volt
transformer for $8.39 (part number 273-1352).

Radio Shack is actually one of the cheapest sources of
such transformers.

Adding a line cord, a duplex outlet, and some sort of
project box to put everything in, the cost of a
bucking arrangement is going to be less than $20 for
one capable of handling 3 amps (which is plenty for
virtually all receivers and many of the lower powered
transmitters).  This compared to $85.68 for 250 feet
of "zip" cord.

Since many electric companies try to maintain 125
volts +/- 2 volts (the "+" side definitely during the
warmer months with air conditioning load) using a 12.6
volt "bucking" transformer will drop the line voltage
to between around 115 and 111 volts depending on just
how high the line voltage.

Glen, K9STH


--- jeremy-ca <km1h at jeremy.mv.com> wrote:

As I said already, it is simply another option. What
is better for you may not be for someone else. Thats
why they made strawberry ice cream.
 
Yes the zip cord output varies with the load but the
load from a radio is constant. It is simple enough to
calculate the load for 1, 2, 3 or more radios and use
a compromise length for a nominal 117 for one radio
and dropping down a bit as others are added. Wire
resistance and current charts have been in the ARRL
Handbook for 75 or so years.









Glen, K9STH

Website:  http://k9sth.com


      ____________________________________________________________________________________
Luggage? GPS? Comic books? 
Check out fitting gifts for grads at Yahoo! Search
http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz