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[TowerTalk] RE: Lubircation of Roller Inductors]

To:, doc <>
Subject: [TowerTalk] RE: Lubircation of Roller Inductors]
From: Joe Giacobello <>
Date: Sat, 14 Aug 2004 10:25:48 -0400
List-post: <>
Doc, FYI. I've attached messages from previous questions on this subject.

73, Joe

-------- Original Message --------
Subject: Re: [Amps] RE: Lubircation of Roller Inductors
Date: Sun, 12 Oct 2003 23:06:35 -0500
From: zilassoc <>
To: Paul Marbourg <>, Amp Mailing List <>
References: <001501c37695$4c312640$>

Properly lubicating the big hard-to-turn roller inductor in my 4K-Ultra
ampifier is very appealing to me.   So, I went to the referenced web site
below, but I was confused by all the various carriers, grades and particle
percentages of molybdenum disulfide options available.  Can someone please
spoon feed me and give me a part number for a small tube of the proper
grease/lub to use on the RF Roller Inductor.  Thank You.  de K5PZ  Pete in

----- Original Message ----- From: "Paul Marbourg" <>
To: "Amp Mailing List" <>
Sent: Tuesday, September 09, 2003 12:43 AM
Subject: [Amps] RE: Lubircation of Roller Inductors

I would like to thank all the kind people who responded to my question regarding the best lubricant for sliding contacts in an old EF Johnson edge-wound roller inductor. Molybdenum disulfide is the obvious winner here. Applied as a slurry solution in a very light film application seems to be the best choice. Avoiding mineral or silicone oil carriers allows for a dry-lubricating molecular film which does not attract dust. Unlike graphite, which tends to be displaced by mechanical shear forces, molybdenum disulfide bonds to the metal substrate and has innate metal-like conductivity. I found the web site Rose Mill Company and their line of Bemol Lubricants. They can provide bulk/small quantities of Molybdenum Disulfide in various grades and particle sizes.

Using a metal-bearing grease type lubricant does not seem like a good choice
here.  Aside from potential hydrocarbon or silicone oil contamination of
dielectric surfaces (aka: vacuum variable insulators), the metal in the
lubricant substrate is not as efficient in conducting RF as an innately
conducting substance like molybdenum disulfide.

Now if I could just make my amp do something truly useful like mow my

Thanks again for the help.
73, Paul WN7T
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