[Amps] Lube for roller inductor

Carl km1h at jeremy.qozzy.com
Wed Aug 1 20:41:41 EDT 2018

Aluminum for the coil???  I kind of doubt that but Ive been wrong a few 
The  Murch I remember only went to 80M also. Most tuners have insuffficient 
C to work well at 80/160 when those were the lowest frequencies they used 
and adding more L just let the smoke out faster.

When Stephen Elliot took over from his father he made several business 
changes, their coil wasnt all that good at high power and some loads anyway.

I dont even own a tuner and modify the amps as needed and/or play with the 
Smith Chart to come up with some length of coax, any impedance, to look good 
to the amp when added to the feed.

Ham since 1955

----- Original Message ----- 
From: "Stan Gammons" <s_gammons at charter.net>
To: "Carl" <km1h at jeremy.qozzy.com>; <amps at contesting.com>
Sent: Wednesday, August 01, 2018 7:38 PM
Subject: Re: [Amps] Lube for roller inductor

> Hi Carl,
> I had taken the roller inductor out of the MFJ tuner to clean the roller 
> since a couple of spots made a noticeable amount of static in the received 
> signal when I tuned across those spots on the inductor. Perhaps too much 
> power dumped in it from my L-4B :) When I took it out I noticed the rear 
> Delrin plate had came back apart. It was broken when I got the tuner and I 
> tried to repair it when regular epoxy. It held for a good while. This time 
> I used some Loctite plastic bonder which will bond to Delrin if you rough 
> the surface up with some 220 grit sand paper. After gluing the Delrin part 
> and letting it cure for 24 hours, I reassembled the roller inductor. It 
> feels different now and is easier to turn. If my Sencore LC75 is correct, 
> the roller doesn't contact the coil in various places. So, I guess it's 
> time get another roller inductor. Or use the Murch tuner I have. It has a 
> beefy roller inductor in it. Looks like #8 aluminum. I don't think it will 
> match as well as the T network used in the older MFJ-989C tuner though. 
> The Murch tuner only has an 18 uh roller inductor too. The one in the MFJ 
> is 30 uh.
> I'm not sure when OEP quit making roller inductors. Seems like the email I 
> got from Steven Elliot said around 20 years ago. I had sent an email and 
> picture asking about the Delrin part because MFJ seem to think OEP made 
> it, but Steven said that wasn't a part for the inductor they made. OEP 
> still makes air variable caps.
> Thanks for telling me about Cardwell Condenser. I didn't know anyone still 
> made any of the E.F. Johnson stuff. May need some of that when I ever get 
> around to building that GI-7B amp. Too many projects and too little 
> time...
> 73
> Stan
> On 08/01/2018 05:01 PM, Carl wrote:
>> Stan, I wasnt aware that OEP quit production, I used to buy many some 
>> years ago.
>> Another place to check is Cardwell Condenser who is now part of Viking 
>> and they still make the old Johnson 229 series..
>> Carl
>> ----- Or
>> iginal Message ----- From: Stan Gammons
>> To: Carl ; amps at contesting.com
>> Sent: Wednesday, August 01, 2018 3:38 PM
>> Subject: Re: [Amps] Lube for roller inductor
>> Hi Carl,
>> MFJ said they use SAF-T-EZE anti-seize.
>> Oren Elliot no longer makes roller inductors. They said they stopped 
>> selling them to MFJ around 20 years ago and MFJ makes their own roller 
>> inductors now.
>> 73
>> Stan
>> On August 1, 2018 10:32:17 AM CDT, Carl <km1h at jeremy.qozzy.com> wrote:
>> Why not contact MFJ who builds theirs as well as Oren Elliot Products 
>> plus Multi Tech Industries who builds "big" ones.Carl----- Original 
>> Message ----- From: "Stan Gammons" <s_gammons at charter.net>To: 
>> <amps at contesting.com>Sent: Sunday, July 29, 2018 11:29 PMSubject: Re: 
>> [Amps] Lube for roller inductor On 07/07/2018 01:05 PM, Bert wrote: I 
>> don't think Penetrox is a good idea for a roller inductor. As far as I 
>> know, Penetrox is only conductive if put under pressure. I would suggest 
>> one of the CAIG DeOxit products, e.g. DeOxit 5. Bert VE3NR Kind of 
>> reviving this thread since I have a roller inductor that was acting a bit 
>> flaky, so I took it out and gave it a good cleaning in my ultrasonic 
>> cleaner. No lubes left on it now and it's very clean. So, what is general 
>> consensus, DeOxit D5 is Ok to use to use on the roller? Unsure how much 
>> of a lubricant it is, but I know it's a great contact cleaner. 73 Stan 
>> KM4HQE Amps mailing list Amps at contesting.com 
>> http://lists.contesting.com/mailman/listinfo/amps ---This email has been 
>> checked for viruses by AVG.https://www.avg.com
>> ---
>> This email has been checked for viruses by AVG.
>> https://www.avg.com

More information about the Amps mailing list