Let's look at some numbers...
Two 3-500Zs are going to pull 5V x 14.5A (each, 145W total) just to light the
filaments whenever the amplifier is ON (even with zero anode current.
Assuming 3KV anode voltage at 150mA, we have about 450W of 'idle' power. But,
that happens only during TX. Averaged over the entire ON time, the value is
much less.
Then, a "VOX" circuit to cutoff anode current when there's no RF drive might
not save as much as you might want. It might be just as easy and/or cheap to
improve ventilation. I recall when I first ran my SB-220. I had it VERY close
to an openable window.
vy 73,Bryan WA7PRC
On Saturday, May 18, 2019, 3:45:26 PM PDT, Jim <jimw7ry@gmail.com> wrote:
Why do you think you need such a thing Joe?
Thanks
73
Jim W7RY On 5/16/2019 11:23 PM, Joe wrote:
Has anyone installed one of these into their SB-220?
http://www.ameritron.com/Product.php?productid=EBS-1H
Joe WB9SBD
On 5/10/2019 7:55 PM, Jim wrote:
I tried to post a schematic and the moderator wont allow it for some unknown
reason.
Schematic is attached.
Thanks
73
Jim W7RY
On 5/10/2019 9:52 AM, Lou Everett, Sr. wrote:
Where is it?
Lou WA5LOU
On Fri, May 10, 2019 at 7:41 AM Jim <jimw7ry@gmail.com
<mailto:jimw7ry@gmail.com>> wrote:
Here is the modification (simple schematic) to the cut-off bias in
the
Kenwood TL-922 amplifier.
-- Thanks
73
Jim W7RY
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Lou WA5LOU
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