{Collins} Re: Resistors in Plate Suppressor Chokes



In reply to the above posting, suggested reading is found at 
http://www.somis.org/Oct88qst.html  In this article by Rich Measures, there 
are several references to Art Collins and his understanding of RF 
amplification.

73
Bob, K4TAX

----- Original Message ----- 
From: "Lee Bahr" <pulsarxp@xxxxxxxxxxxxx>
To: <collins@xxxxxxxxxxxxx>
Sent: Sunday, January 23, 2005 8:04 PM
Subject: {Collins} Resistors in Plate Suppressor Chokes


>I would like to hear from those who ACTUALLY DID rebuild their plate
> suppressor chokes.  We all know 2 watt carbon composition resistors are 
> hard
> to find.  We hear stories MAYBE carbon film is not the way to go because 
> of
> inductance reasons.  We hear metal film resistors may work.  We hear you
> PROBABLY should use Ohmite OY ceramic carbon film resistors.  (This makes 
> a
> lot of sense to me).
>
> I sure would like to hear from those who ACTUALLY DID try carbon film, 
> metal
> film, and of course, the logical choice Ohmite OY ceramic carbon film
> resistors to replace 2 watt 47 ohm to 120 ohm carbon composition resistors
> when rebuilding their plate suppressor chokes.  Who has actually tested
> these newer resistors in their Collins S-line or Drake equipment?  Did
> you actually find carbon film did not work?  Did you find ohmite OY to 
> work
> as well as composition resistors for this application?  Have you looked at
> the outcome with a spectrum analyzer for parasitics?
>
> The reason I ask is I am about to order a BUNCH of Ohmite OY resistors 
> (200
> of them) and they are not cheap.  I want to replace a lot of my old chokes
> with new ones.  (I don't trust the old coils Q any longer).  Consequently,
> I'd like to buy the best alternative choice and get some first hand
> knowledge from those that have gone before me.  (I'm not looking for 
> theory
> but info from those that actually have tried these other resistors to find
> out what they experienced when they tried the different types).  I am not
> interested in finding NOS carbon resistors for replacements.  I'm guessing
> Ohmite OY is the way to go but I really don't want to guess.  WHO REALLY 
> HAS
> DONE THIS AND KNOWS?  I sure would appreciate hearing from you.  (I hope I
> have not offended anyone.  It is just that I am not interested in hearing
> about finding some NOS resistors, or Wille has 5 carbon composition ones 
> he
> would sell or why carbon film resistors probably would not work, or don't
> change them out as your's are probably OK, etc).
>
> Lee Bahr
> w0vt
> Houston
>
>
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> http://www.collinsradio.org
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Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
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