[Amps] filament transformers

[RICHARD SOLOMON]

Neat Amp, good job, I got some ideas.

When do we get to see the 6 Meter Amp ??

 

73, Dick, W1KSZ
 
> From: w7ry at arrl.net
> To: w7ry at arrl.net; amps at contesting.com
> Date: Sat, 16 May 2009 08:20:39 -0700
> Subject: Re: [Amps] filament transformers
> 
> BTW you can see my amplifier here:
> 
> http://home.centurytel.net/w7ry/Jims%20Amplifier%20Page.htm
> 
> 
> 73
> Jim W7RY
> 
> ----- Original Message ----- 
> From: "Jim W7RY" <w7ry at arrl.net>
> To: <amps at contesting.com>
> Sent: Saturday, May 16, 2009 7:50 AM
> Subject: Re: [Amps] filament transformers
> 
> 
> > My homebrew 3CX800 amplifier filament transformer started with a 3 amp 12
> > volt Radio Shack transformer. I did not have enough voltage so I simply
> > added a few turns and increased the voltage for the two tubes.
> >
> > The transformer had lots of extra space on the windings and I did not even
> > have to remove the laminations. I simply carefully scramble wound about 10
> > more turns of #18 (could have been #20) enameled wire. Kept measuring the
> > voltage until I had what I needed.
> >
> > The original windings were scramble wound too so no need for neatness with
> > my added windings.
> > 73
> > Jim W7RY
> >
> >
> >
> > ----- Original Message ----- 
> > From: "robert briggs" <vk3zl at bigpond.com>
> > To: <amps at contesting.com>
> > Sent: Saturday, May 16, 2009 6:03 AM
> > Subject: [Amps] filament transformers
> >
> >
> >> You are right Carl...I have always had the roving eye at hamfests and
> >> disposal stores..I once brought 5 new Jennings vac variables, 5-500pf
> >> for one dollar each at a disposals place...When I took them to the
> >> counter and asked how much, the guy said $5 for the glass tubes....I
> >> nearly ran all the way home...
> >>
> >> It is a shame that a lot of the old arts of home brew are being lost
> >> these days..I know that many think that they don't have the ability but
> >> the fact for me has been necessity as many components are just not
> >> available in VK and too expensive to import..I still have a shed full of
> >> "treasures" which I have collected over the years and I regularly search
> >> through forgotten boxes of heaven knows what and old chassis looking for
> >> "that" part" to complete a project..
> >> I remember my first 80 meter transmitter crystal controlled...I pulled
> >> apart many old FT43 crystals and re ground them on a piece of glass with
> >> some bath cleaner, a painstaking job that many hams much older than me
> >> will remember well..That was about the time I started re winding old
> >> transformers and have been doing it since...You have to be inventive
> >> some of the time but I guess that is what gives us the satisfaction when
> >> you put something together and bring it to life...
> >>
> >> Ah well, I guess time moves on and things change....
> >>
> >> 73 all..Bob VK3ZL..
> >> _______________________________________________
> >> Amps mailing list
> >> Amps at contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >
> >
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