You keep replying as if he is asking about something for COAX, and HF - he's
asking about little bead on the leads of tubes inside a device, and is SLIGHTLY
OT.
-----Original Message-----
From: RFI <rfi-bounces+charlie=thegallos.com@contesting.com> On Behalf Of Jim
Brown
Sent: Thursday, July 18, 2024 2:12 PM
To: rfi@contesting.com
Subject: Re: [RFI] Info needed
Yes, but he wants something that doesn't work. I could fill my gas tank with
water, but it wouldn' get me very far!
The only bead that WORKS at HF with no turns is Fair-Rite #73, and the largest
size just fits on RG142. It's the one that Walt Maxwell used in his very good
paper way back when. And to do anything useful, he showed that you need 100 of
them to make a dent, the largest number used several chokes he published.
Sadly, the only ones ever sold following his idea were for the the smallest
number of beads, and they were BADLY under-rated for power or to kill noise,
because there weren't nearly enough of them.
73, Jim K9YC
On 7/18/2024 6:01 AM, Wes Stewart via RFI wrote:
> Did you actually read what the OP said? It's a rhetorical question; of
> course you didn't, otherwise you would not have issued your usual
> answer to anything ferrite. He has a specific need, a suppressor bead
> he can slip onto a wire near the pins of tube sockets. You want him
> to wrap ten turns of wire through a big core. He wants a BEAD. As far as I
> can determine, you can't buy a BEAD in mix 31. (If you can, please
> pass along the source) Mix 43 has been used successfully for this
> purpose for years. You can actually buy a mix 43 bead. A wise old
> engineer once told me, "You should never use parts you ain't got."
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