I pushed the HV up a LOT, now running 3700/3800 volts.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com <http://www.idle-tyme.com>
On 3/30/2021 9:48 AM, Jim wrote:
Why do you need more L?
On what band or bands?
Thanks
73
Jim W7RY
On 3/24/2021 9:46 AM, Joe wrote:
Need advice,
I am assuming some of you here are also on the Heathkit HF Amps E
-Mail list.
So I won't go into the long drawn out story here unless asked to do
so if needed.
I re-built this old SB-220 practically from scratch. And changed a
lot of stuff to make it better.
But one change it has been determined, has made it in the Need of
needing more "L" in the output network.
That of course if even possible would be some major surgery to say
the least. Trying to think of how I can add some more "L".
At 2 AM last night I had a thought. How about like an old Drake
VFO!? Drakes varied the "L" in their VFO's not the "C" as most
others did.
And they varied it by inserting a ferrite bar into the coil.
Research says that inserting Ferrite into a coil will increase the
amount of "L" the coil has.
I wonder if I could cheat and do the same on the L7 coil of this amp?
Get some ferrites like on a plastic threaded rod and insert them
into the coil.
What Mix of Ferrite would be best for such an application?
And anyone thoughts of possibility of success?
Joe WB9SBD
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