[Boatanchors] Boatanchors Digest, Vol 181, Issue 20

Wed Feb 27 12:24:38 EST 2019

Thanks Ralph buddy

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Subject: Boatanchors Digest, Vol 181, Issue 20

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Today's Topics:

   1. Re: Corrosion on tube pins and sockets (Glen Zook)
   2. Re: Corrosion on tube pins and sockets (Donald Chester)
   3. Qst article (RAY FRIESS)
   4. Transmitting Type Variable Caps Needed (Bill Stewart)
   5. Re: Qst article (RAY FRIESS)

----------------------------------------------------------------------

Message: 1
Date: Tue, 26 Feb 2019 16:42:05 +0000 (UTC)
From: Glen Zook <gzook at yahoo.com>
To: "W9RAN at oneradio.net" <W9RAN at oneradio.net>,
	"boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] Corrosion on tube pins and sockets
Message-ID: <464856584.3855879.1551199325442 at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

I dip the tube pins in Goddard's Silver Dip, or TarnX - same thing, to clean
them.? That usually takes care of corrosion, etc.

As for loose contacts in tube sockets:? Those can usually be tightened by
inserting a needle, thin probe, etc., between the insulating medium of the
socket and the metal of the contact.? Bend the contact towards the middle
applying just enough force to tighten the contact.? I have been doing this
for decades and the procedure works very well.

?Glen, K9STH?
Website: http://k9sth.net

      From: Robert Nickels <ranickel at comcast.net>
 To: boatanchors at mailman.qth.net 
 Sent: Tuesday, February 26, 2019 10:29 AM
 Subject: Re: [Boatanchors] Corrosion on tube pins and sockets

Tube pins that look crusty get cleaned with a wire brush Dremel tool on 
my bench.? A few passes around the outside and up in between, good as 
new.??? Tube socket terminals were designed to exert high contact force 
and the scraping action when inserting a tube is usually sufficient to 
clear off surface crud.?? Tube pins and sockets weren't designed to need 
any magic fluid or lubricant, but carefully applied DeOxit won't hurt.? 
Just don't go blasting it into tube sockets, especially phenolic ones, 
which absorb liquids.?? The De-Oxit knowledge base has a lot of good 
information: http://store.caig.com/s.nl/sc.12/category.3/ctype.KB/KB.218/.f

The bigger problem is when socket pins lose tension,? I recently had to 
replace several 9 pin miniature tube sockets on a Heathkit singlebander 
which had become intermittent - one was so loose that the tube actually 
fell out when I turned the radio upside-down. Never ran into that before.

------------------------------

Message: 2
Date: Tue, 26 Feb 2019 17:16:00 +0000
From: Donald Chester <k4kyv at hotmail.com>
To: "boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] Corrosion on tube pins and sockets
Message-ID:

Content-Type: text/plain; charset="iso-8859-1"

I have found that WD-40 works as well as or better than Deoxit and other
contact cleaners.  NEVER spray it on; spray a little into a bottle cap or
other small vial, and use a toothpick or loop of small gauge wire to
transport a small drop to the contacts in question, whether  switch contacts
or female receptacles in a tube socket.  You want to use just enough to wet
the flaky contact and nothing else.  Phenolic absorbs liquid, and residue
clinging onto surfaces like ceramic makes an excellent dust magnet.  WD-40
permanently repaired the noisy AF gain pot in my 75A-4, whereas "contact
cleaner" would only temporarily quieten the noise for a few weeks.

The greatest problem I  have had with tube pin contacts is when tubes or
sockets have lain for years on the shelf, with no tube in the socket or the
tube not inserted in a socket, and the entire contact surface has corroded
from humidity in the air.  My solution has been to first clean the tube pins
with fine steel wool (never use sandpaper), and then wet them with WD-40 or
your preferred contact cleaner, and then insert and remove the tube from the
socket several times, allowing the tube pins to  clean the socket.  In  case
of heavy corrosion of a socket, I  have successfully cleaned the clips by
rolling a small piece of fine steel wool into a small roll about the size of
a tube pin, and working that back and forth inside the clip and then
twirling with a rotating motion inside the socket clips.

I once "mined" some VT4-C/211 tubes that I found completely buried in the
ground in a room in an old house where the floor had rotted out decades
earlier and the tubes, some still in the remains of their boxes, had fallen
to the ground, then the decomposing, termite infested wood gradually turned
into soil.  The bases and pins of the tubes were badly corroded, but careful
cleaning and polishing with fine steel wool fully restored the pin contacts
with no evidence of etching.  The aluminium tube bases remained pitted from
corrosive minerals in the soil, but otherwise were OK. After cleaning, about
10 of the dozen of so tubes tested good as new and only a couple were weak
or dead.  I use a 211 in my homebrew rig to drive the pair of HF-300s in the
final, so that gave me probably a lifetime supply of spares.  To keep them
from gassing up, I  rotate spares into the rig periodically.

Don k4kyv

------------------------------

Message: 3
Date: Wed, 27 Feb 2019 02:32:29 +0000
From: RAY FRIESS <rayfrijr at msn.com>
To: boatanchors <boatanchors at mailman.qth.net>,
	"boatanchors at puck.nether.net"	<boatanchors at puck.nether.net>
Subject: [Boatanchors] Qst article
Message-ID:

<DM6PR01MB4172949E2C46EC02CFE75BA8CA740 at DM6PR01MB4172.prod.exchangelabs.com>

Content-Type: text/plain; charset="us-ascii"

I've been trying to locate an article on circularly polarized quagis from
the January 1990 qst.  Anyone with a 1st library that could scan it for me?
Thanks

Get Outlook for Android<https://aka.ms/ghei36>

------------------------------

Message: 4
Date: Wed, 27 Feb 2019 09:52:23 -0500 (EST)
From: Bill Stewart <cwopr at embarqmail.com>
To: boatanchors <boatanchors at mailman.qth.net>
Subject: [Boatanchors] Transmitting Type Variable Caps Needed
Message-ID:
	<1232497993.34808960.1551279143779.JavaMail.zimbra at embarqmail.com>
Content-Type: text/plain; charset=utf-8

These items seem to be getting in short supply....and pricey. I am looking
for two 100mmf 
(min. but a few mmf on the plus side would probably be ok) air variable caps
for a low power 
(spaced for 25w) pi-net. The ones shown in the article look like about the
size of half of a two- 
gang type of BC capacitor. It has about 15 rotor plates, with 1/4" shaft. I
have looked at my 
normal sources, AES. PTOP, Neb. Sales, Fair Radio, etc but nil. Did see one
some where 
that was about 18 bux each. Any one have a source or a junk box full of
these type variables? 
Thanks...73 de Bill K4JYS 

------------------------------

Message: 5
Date: Wed, 27 Feb 2019 15:18:21 +0000
From: RAY FRIESS <rayfrijr at msn.com>
To: boatanchors <boatanchors at mailman.qth.net>,
	"boatanchors at puck.nether.net"	<boatanchors at puck.nether.net>
Subject: Re: [Boatanchors] Qst article
Message-ID:

<SN6PR01MB4173CCDBB3D37E06D8D22B07CA740 at SN6PR01MB4173.prod.exchangelabs.com>

Content-Type: text/plain; charset="us-ascii"

Thanks to all for the help.  Appreciate this group's always jumping in to
lend a hand.

Get Outlook for Android<https://aka.ms/ghei36>

________________________________
From: RAY FRIESS <rayfrijr at msn.com>
Sent: Tuesday, February 26, 2019 7:32:29 PM
To: boatanchors; boatanchors at puck.nether.net
Subject: Qst article

I've been trying to locate an article on circularly polarized quagis from
the January 1990 qst.  Anyone with a 1st library that could scan it for me?
Thanks

Get Outlook for Android<https://aka.ms/ghei36>

------------------------------

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End of Boatanchors Digest, Vol 181, Issue 20
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