Of course I know that it is a triode. No shorts were measured. But this tube makes noises that a good tube does not make. I would not trust it as far as I could throw the amp it was in.
73
-Jim
NU0C
On Wed, 14 Feb 2024 06:15:13 -0600
"David" <david.w5xu@...> wrote:
Remember this is a triode. There is roughly a 1/2 inch separation between
the inside face of the plate cylinder and the grid. There is a tiny
distance between the grid and the filament and that is where most of the
shorts develope.
So if the grid/ filament is shorted (you can measure this with an
ohmmeter) the tube is likely not salvageable. These are the ones you make
lamps out of.
Bumping the plate structure does little movement to the grid. You would
think that with a +- $300 each you would get a better deal. Too bad as
when they are good and in service barring abuse they last a good while.
David Assaf III
W5XU VP8RXU
On Tue, Feb 13, 2024, 11:52 PM Jim Shorney <jimNU0C@...> wrote:
Not even going to try with the one I found. While I don't see anything
rolling around inside the envelope, I do definitely hear mechanical noises
from inside the plate structure when the tube is rotated or gently shaken.
I would not trust it even if I could get the plate straight.
73
-Jim
NU0C
On Tue, 13 Feb 2024 22:13:54 -0600 (CST)
"Gary Follett" <xntrick1948@...> wrote:
The Eimac 3-500Z is one of the most fragile tubes in existence in terms
of the plate support structure. However, you CAN repair a bent 3-500Z by
banging it against a firm, but not hard surface just hard enough to swing
the plate back into the desired neutral centered position. I have done this
dozens of times with great results. Best to do the tapping below the
centerline of the plate relative to the base.
Gary
W0DVN
On 02/13/2024 10:31 AM CST Joe - W7RKN <w7rkn.7@...> wrote:
Sorry Jim¡.The courts have ruled otherwise. You are buying a specific
amount of ¡®bulk¡¯ insurance, say $500.00¡that is what you are entitled to if
there is a loss. If the item shipped was valued at, say, $354.95 and you
bought insurance for $354.95, then *that* is what you would receive in a
loss.
Joe - W7RKN
From: [email protected] [mailto:[email protected]] On Behalf
Of Jim VE7RF
Sent: Tuesday, February 13, 2024 2:13 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] All bent out of shape (3-500z) - now shock
sensor value question
On Tue, Feb 13, 2024 at 01:57 AM, Joe - W7RKN wrote:
<When we purchase shipping insurance through whomever, they will
always tell you to submit an invoice for the product loss. I tell them,
nuts to you¡I paid for 500 dollars of insurance, cut me a check for 500
dollars. I took UPS to court on <this a number of years ago and won. Just
an FYI!
## You can't insure it for more than it's worth.
--
73
-Jim
NU0C
--
73
-Jim
NU0C
Jim Shorney