,
milliohms make a difference!
Steve, W1ES/4
-Original Message-
From: Jim Shorney jshor...@inebraska.com
Sent: Jan 3, 2012 11:26 PM
To: drakelist@zerobeat.net drakelist@zerobeat.net
Subject: Re: [Drakelist] L4B oddity
Do you ever run with color on the plates? It's required that they get a little
d...@martineer.net
Cc: richard radke rar...@excite.com, drakelist@zerobeat.net
Subject: Re: [Drakelist] L4B Oddity
Don -
There seems to be a lot of confusion over 'silver solder' and 'silver-bearing
solder'.
Silver solder melts at around 1300 degree F, and is typically applied with a
small
All,
Thanks to everyone who made suggestions. Solder on the pins all look
ok. .5Ω's on each filament. I'm guessing a grid to filament short/
leak when it gets hot. I did notice a slight bit of clouding near
the top of the envelope that wasn't there before. Maybe from running
the
Do you ever run with color on the plates? It's required that they get a little
bit red in operation for the gettering to work.
Also, just a tiny bit of extra resistance in the filament pin is all it takes
to dim a tube. An ordinary Ohmmeter won't register the difference.
73
-Jim
On Tue, 3
: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of Jim Shorney
Sent: Tuesday, January 03, 2012 10:26 PM
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] L4B oddity
Do you ever run with color on the plates? It's required that they get a
little bit red in operation
: [Drakelist] L4B oddity
Agree. Using an ohm meter would show little unless zero. For example, if
the resistance caused by the pin adds 0.1 ohm, then for a 15 amp filament,
that is a 1.5 volt drop; 30% less than normal. If you had a grid to
filament short you were right on time for the new year's
I have an unusual situation underway in my L4B. Evan, you out
there? Been working fine until yesterday (i know, well happy new
year) one of the 3-400's filaments is half as bright as the other. I
reversed the tubes and the same tube was dimmer in the opposite
hole, and the amp and
On the first question, I have heard of the solder melting out of the pins on
the filaments of both the 3-500Z and the 3-400's. If that has happened to
your tube, you might be able to just re-solder it and be okay. Some have
said to silver solder it, but it seems to me that silver solder
Assaf, III
W5XU
-Original Message-
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of richard radke
Sent: Monday, January 02, 2012 6:31 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] L4B Oddity
I have an unusual situation underway in my L4B. Evan
On Mon, 2 Jan 2012 19:41:59 -0600, David wrote:
Do a very close and careful check of the filament pins on the tube. The
tube sockets used were notorious for relaxing the friction connection on the
pins; the higher resistance created heat and the solder of the pins flowed
out. The fix is to
Don -
There seems to be a lot of confusion over 'silver solder' and 'silver-bearing
solder'.
Silver solder melts at around 1300 degree F, and is typically applied with a small torch. It's
primarily used for jewelry and other tasks needing a 'hard' solder. I doubt if the glass metal
seals
On Mon, 02 Jan 2012 22:26:58 -0500, Garey Barrell wrote:
There seems to be a lot of confusion over 'silver solder' and 'silver-bearing
solder'.
Indeed, someone edumacated me on the semantics some time back. I've been
asked the question often enough that I still have the display card from the
Thanks for that clarification, Garey. I had never heard of silver-bearing
solder. I've told you that I never was in electronics professionally, and
only had the minimal USN training for radio ops, not the Electronics Techs
that did get the full, good stuff, hi.
The silver solder I was
On Mon, 2 Jan 2012 22:07:05 -0600, Don Cunningham wrote:
I use 63/37 here nearly all the
time, only use the 60/40 outside on the antenna wires in a larger size and
was afraid the 63/37 would melt too easily.
63/37 melts at almost the same temp as 60/40, but it has the advantage of going
from
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