Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
Johnson Inductor Cleaning




 
The AM Forum
August 17, 2022, 03:05:47 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: Johnson Inductor Cleaning  (Read 793 times)
0 Members and 1 Guest are viewing this topic.
KD1SH
Member

Offline Offline

Posts: 427



« on: June 22, 2022, 08:55:17 PM »

I've got one of those big Johnson rolling "edge-wound" inductors - a model 226-2. Not technically a "roller" inductor, since the roller is actually a sliding contact. It's in excellent condition, but the plating could use a little cleaning. An old Johnson/Cardwell catalog describes it simply as "plated", but doesn't specify what sort of plating it is, though it looks like it might be silver. Has anyone tried cleaning one of these? I'm thinking I might try brushing on some of my wife's silver jewelry cleaner (not abrasive), but I don't want to risk damaging the plating. I've also got a similar B&W inductor that also looks like silver plate.
Logged
W7TFO
WTF-OVER in 7 land Dennis
Contributing
Member
*
Online Online

Posts: 2423


IN A TRIODE NO ONE CAN HEAR YOUR SCREEN


WWW
« Reply #1 on: June 22, 2022, 10:14:50 PM »

Scroll thru this thread:

https://forums.qrz.com/index.php?threads/w7tfo-hints-kinks-fear-loathing-in-the-land-of-engineering.525303/

Amongst my other items, I have a write-up on just such a restoration.

73DG
Logged

Just pacing the Farady cage...
KD1SH
Member

Offline Offline

Posts: 427



« Reply #2 on: June 23, 2022, 09:52:01 AM »

Thanks - I will check that out.

Scroll thru this thread:

https://forums.qrz.com/index.php?threads/w7tfo-hints-kinks-fear-loathing-in-the-land-of-engineering.525303/

Amongst my other items, I have a write-up on just such a restoration.

73DG
Logged
WB6NVH
Member

Online Online

Posts: 236


WWW
« Reply #3 on: June 23, 2022, 12:35:58 PM »

And...why is it always my luck that there is a arc spot right exactly where I need to be, such as 3870, 3885 etc.... Angry
Logged

Geoff Fors
Monterey, California
KD1SH
Member

Offline Offline

Posts: 427



« Reply #4 on: June 23, 2022, 06:32:19 PM »

Very cool - thanks. Just so happens that I've got a bottle of Tarnex handy.
The catalog says "...handle well over a kilowatt of plate modulated RF energy to 30 Mhz". I wonder if that means a 250 watt carrier modulated 100%, or a 1000 watt fully modulated carrier? It's a pretty robust coil.

Scroll thru this thread:

https://forums.qrz.com/index.php?threads/w7tfo-hints-kinks-fear-loathing-in-the-land-of-engineering.525303/

Amongst my other items, I have a write-up on just such a restoration.

73DG
Logged
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2491


Making AM GREAT Again!


« Reply #5 on: June 23, 2022, 09:00:03 PM »

That would be a kilowatt I put, appx 700 watts carrier and 2.8kw pep or so.

Think of it as a roller for a desk kw.


--Shane
WP2ASS / ex KD6VXI
Logged
WBear2GCR
Member

Offline Offline

Posts: 4108


Brrrr- it's cold in the shack! Fire up the BIG RIG


WWW
« Reply #6 on: June 24, 2022, 09:40:07 AM »

Very cool - thanks. Just so happens that I've got a bottle of Tarnex handy.

<snip>

73DG


GLOVES.
Definitely use gloves with "Tarnex".
Also rinse with a solution of baking soda... it's an acid.
Followed by clear water...

               ymmv.

                             _-_-bear
Logged

_-_- bear WB2GCR                   http://www.bearlabs.com
KD1SH
Member

Offline Offline

Posts: 427



« Reply #7 on: June 24, 2022, 10:34:52 AM »

Yes, very good idea. Many years ago, when I was into boats, a local boat shop recommended a powerful cleaner for me to use to clean a corroded brass air cleaner. I bought a bottle, and it worked amazingly well, but that brass part smoked in the solution. The cleaner was basically pure acid. Nasty stuff.

Very cool - thanks. Just so happens that I've got a bottle of Tarnex handy.

<snip>

73DG


GLOVES.
Definitely use gloves with "Tarnex".
Also rinse with a solution of baking soda... it's an acid.
Followed by clear water...

               ymmv.

                             _-_-bear
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.038 seconds with 19 queries.