At 11:39 AM 10/3/99 -0500, you wrote:
>
>About:
>
>"I am building an amp with four 3-500Z using low bands only (160 and
>80m).
>I do have two filament transformers, 5V/80A w/o a center tap on the
>secondary coil. The other one contains four coils with 5V/25A ea. coil
>also
>w/o any center taps on the secondary side." (Etc.)
>
>How about connecting a small "audio" or "power supply" choke from each
>side of the secondary to "eventual" ground? Calculate the inductance
>value of them so that they will only allow a negligible (AC) current
>flow to ground while maintaining a balanced condition for all voltages
>involved in the circuits. I think reasonable sized, cheap chokes may be
>possible but must have low DC resistances. Maybe from junk box.
>
>73, Roy K6XK
I use a small filament transformer with a secondary center tap. Connect the
secondary across the big transformer secondary. Leave the primary open. Use
the small transformer secondary center tap for your cathode return.
73,
Larry - W7IUV
w7iuv@arrl.net
http://www.axtek.com/w7iuv
Amp pix at http://207.108.137.61
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|