[Milsurplus] More Fun with BC-230 - 30 Meters
Richard
brunneraa1p at comcast.net
Sun Aug 3 10:53:05 EDT 2014
About the 5763: See "Intrinsic Negative Resistance as a Cause of
Parasitic Oscillations in Beam Power Tubes," by David Newkirk," for more
than you want to know. The 5763 is an exemplary example, and "may" be
cured by adding a 100 Ohm non-inductive resistor between the screen
terminal and bypass capacitor. I personally practice Beam Power Tube
Avoidance.
Richard, AA1P
On 08/03/2014 07:48 AM, David Stinson wrote:
> While working on a way to get the BC-230 5-6 MC coil to
> scoot-up to 40 meters, I managed to booger-ize one of
> the PA Tank/Antenna coils.
> Rather than can it, I rewound it. Used the BC-230 with
> the 6AQ5s (have abandoned the 5763s- too hard to
> neutralize and de-FM). Unwound the tinned coil wire,
> covered the thin, fragile link coil under it with a single layer
> of tape and used the tinned wire to wind a 12-turn tank coil.
> Yes; the wire's "lumpy" from being on that form.
> I'll rewind it with fresh wire later.
> Here's a crummy picture:
> http://home.netcom.com/~arc5/SCR-183/230-30m.jpg
>
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