Richard -
That is an excellent book. All those terms are just fancy names for
what we call GAIN. Simply put, it refers to what happens if we put
filament, plate, (screen) and grid potentials on a tube, and then
wiggle the voltage on the grid, what happens to the current through
the tube.
Richard -
This might be due to relay K2 contacts. This is the relay that shifts
the Carrier Oscillator to within the LSB filter passband for CW
operation. Be worthwhile to clean those contacts with a little DeoxIT
soaked paper strip.
** This may be one of those, shoulda' sent it in
of view, the only other group still
using tubes.
73,
Bob WW3QB
--- On Sat, 1/30/10, Richard Palmer burnto...@toast.net wrote:
From: Richard Palmer burnto...@toast.net
Subject: [Drakelist] What circa tube tester?
To: Drakelist@zerobeat.net
Date: Saturday, January 30, 2010, 9:03 PM
I hope
On Sun, 31 Jan 2010 08:18:24 -0800 (PST), Robert Ladden wrote:
I have had good luck with a Jackson 648A tester. It is not an expensive Hickok
mutual conductance tester. It uses a Dynamic testing circuit and there is
much debate if that is really better than simple emission testing. But it does
Bob -
That's a very good site reference. Lots of good information there.
The Life Test typically just reduces the filament voltage on the
tube. This indicates whether the cathode is straining to deliver enough
electrons, (wearing out,) or has life left! If the meter indications
stays
-I have a Hickock that my bookeeper gave me 35 years ago (her husband
liberated it from the phone co,)
Great unit...still works good
73 Bud WØHG
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known bad apples.
73,
Ron WD8SBB
--- On Sun, 1/31/10, Robert Ladden rmlad...@yahoo.com wrote:
From: Robert Ladden rmlad...@yahoo.com
Subject: Re: [Drakelist] What circa tube tester?
To: Drakelist@zerobeat.net, Richard Palmer burnto...@toast.net
Date: Sunday, January 31, 2010, 11:18 AM
I
%.
73,
Bob WW3QB
--- On Sun, 1/31/10, Garey Barrell k4...@mindspring.com wrote:
From: Garey Barrell k4...@mindspring.com
Subject: Re: [Drakelist] What circa tube tester?
To: Drakelist@zerobeat.net
Date: Sunday, January 31, 2010, 11:41 AM
Bob -
That's a very good site reference. Lots of good
...@mindspring.com
Subject: Re: [Drakelist] What circa tube tester?
To: Drakelist@zerobeat.net
Date: Sunday, January 31, 2010, 11:41 AM
Bob -
That's a very good site reference. Lots of good
information there.
The Life Test typically just reduces the filament voltage
on the tube. This indicates whether
I hope this is not off topic. With the use of vintage being used for
all Drakes and tube testers, many from the 1940's and before, up to the
last ones made, it has become impossible for me to determine what will
service my early TR-4.
I have spent hours and hours looking up tube testers by
Richard -
First, there are two major types of tube testers. The least expensive
is the Emission type which merely applies power to the filament and
plate of a tube and measures the current on a Good-?-Bad meter scale.
They are slightly better than using an ohmmeter on the filament pins to
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