[Hallicrafters] Solid state rectifier and matching 6V6s

[Donald Sanders]

I found a transformer with 115 volt primary and two 6.3 volt 10 amp
windings.I have them wired to drop the 125 volts by 6 or 12 volts with a
switch and it works well.

Healthfully yours,
                          Don W4BWS
----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: "jeremy-ca" <km1h at jeremy.mv.com>; "Edward B Richards" <zuu6k at juno.com>
Cc: <lrlayton at cox.net>; <iluznst at yahoo.com>; <hallicrafters at mailman.qth.net>
Sent: Sunday, September 09, 2007 10:09 AM
Subject: Re: [Hallicrafters] Solid state rectifier and matching 6V6s


> 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
>
>
>
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