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We have an opportunity to buy a quantity of UV3 knobs, but there is a minimum
buy from the supplier. If there is enough interest, we can get them for around
$24 plus postage for a set of 8. Any interest?
Let me know at bjwag...@bresnan.net.___
A simple question (as if there really are any) about the Keying circuit of an
L4B. Because I use several radios to drive the L4B I have a relay connected to
the amplifier keying circuit that really only grounds the leads, that has now
failed to work. I looked at the schematic and it appears
John -
The relay circuit in the L-4B is a very simple half-wave supply on a
dedicated winding of the filament transformer. The you should measure
~30 VDC from one pin to chassis, the 'other' pin is grounded. The
reference about 'reversing the pins' is because some transmitters have
one relay
Don, Paul -
Agreed! IF you have 'new' tubes, there is nothing wrong with replacing
an existing tube, readjusting the appropriate alignment, and seeing if
the 'new' tube is better! If it IS better, decide if it's enough better
to warrant the change, and put the 'other' tube in the spares
John,
For the VOX connector/circuit to work, the ALC pot switch must be in the out
position.
How much voltage is on the pins is based upon whether it is a stock linear or
if it has had one of the circuit boards added to allow it to be compatible with
solid state rigs. The voltage on the
Guys come on, notice I've been operating the amp for a while with multiple
rigs.. Clearly that's not the problem, I'm suspecting a diode.. But we'll see.
De WA6HYQ
-Original Message-
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On
Behalf Of Garey Barrell
Evan brought up a good point. MY information was regarding an
unmodified L-4B. Quite likely an open diode.
But there are a lot of amps that have been modified to work with the
wimpy relay or transistor VOX switches in newer rigs.
And I doubt you'd be the first guy to bump the ALC knob in
Here's an interesting find - well, to me, anyway: #2052 does not have a
little red button on the main dial so that it can be slid back forth for
calibration. In fact, the manual says:
The dial scale is marked in 10 KC divisions and is adjustable for
calibration purposes by sliding
Paul -
Hm... The FIRST 2-A schematic is 1001, and the 2-A did NOT have
the button on the dial. The first 2-B schematic I've been able to find
is 3001, dated 9/22/61, with very minor circuit changes, including the
change from 6BN8 to 8BN8. However, the lowest 2-B s/n unit I have seen
I have #2277 Drake 2B and it does not have the red button either. It
has the 8BN8 tube.
73, Bob W5GU
On 8/18/10 1:49 PM, Garey Barrell wrote:
Paul -
Hm... The FIRST 2-A schematic is 1001, and the 2-A did NOT have
the button on the dial. The first 2-B schematic I've been able to
I think I've found the answer to the no output problem I previously
described. I think the tuning at the lower levels on the T-4X may have been
messed with at some time and I will have to take slug measurements (a Drake
tech, 25 or so years ago, told me to never touch those if nobody had ever
My 2-B #4281has a white button. It seems original. I wonder what happened.
73,
Bob WW3QB
--- On Wed, 8/18/10, Bob W5GU boboftu...@gmail.com wrote:
From: Bob W5GU boboftu...@gmail.com
Subject: Re: [Drakelist] Something for the 2B rivet counters
To: drakelist@zerobeat.net
Date: Wednesday, August
Not strictly a Drake question, but I'm using this with my TR-7, so
there's at least a *tenuous* connection!
I have a Ten-Tec model 291 antenna tuner. There are three knobs on
the front. In order:
Transmitter matchInductance Load match
No manual...can someone tell
So far on the 2B front-glass-move-the-dial button we have:
#2052no buttonK4MSG
#2277no buttonW5GU
#4281white buttonWW3QB
Any more? Just email the serial number, button status, and your
callsign and I'll enter them into the database.
My 2-B SN#3608 has a red button.
Dino KL0S
On 18Aug2010, at 9:57 PM, ph...@aol.com wrote:
So far on the 2B front-glass-move-the-dial button we have:
#2052no buttonK4MSG
#2277no buttonW5GU
#4281white buttonWW3QB
Any more? Just email
#6169 2B with pink button.
Jim Z
KA0VSL
Robert Ladden wrote:
So far on the 2B front-glass-move-the-dial button we have:
#2052no buttonK4MSG
#2277no buttonW5GU
#4281white buttonWW3QB
Any more? Just email
2B #10040 pink to white (probably originally red, hi) WB5HAK. I guess I have
the baby, so far, huh??
73,
Don, WB5HAK___
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Bob -
I don't know that there were NOT white buttons, but while I've seen a
lot of red ones, I've also see quite a few that were white with traces
of red where they went through the glass, or near the base. Possibly a
'Sun' thing?
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line
On Wed, Aug 18, 2010 at 05:58:57PM -0500, Brian Koontz wrote:
I have a Ten-Tec model 291 antenna tuner. There are three knobs on
the front. In order:
Got my answer, thanks!
--Brian/WA3ITE
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S/N 10172 RED button.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
ph...@aol.com wrote:
So far on the 2B front-glass-move-the-dial button we have:
#2052no buttonK4MSG
#2277no buttonW5GU
#4281
#12087 has a RED button, but it appears to have been painted by the previous
owner because it is white where it goes through the Plexiglas front dial.
73, Duane
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
_
From: drakelist-boun...@zerobeat.net
I removed my 2-B from the cabinet to view the button from behind. It is more
pink,back there so it probably was red so many years ago. The red switches are
still red and the dial is clear, so it may have not been in the sun. Perhaps
the replacement buttons had better dye and stayed red.
OK, we're homing in on the transition point. With 12 entries submitted,
#2813 has no button and #3608 does, so that narrows the transition point to
somewhere in that delta of 795 units.
The baby of the 12 submissions is #12087; the elder statesman is
#2052 (mine).
If anyone can
Are the knob pointers (AF gain, RF gain, bandswitch, etc.) supposed to be
silver or white? All of mine look silver except for one that has been
clumsily painted over with some kind of white substance.
73 DE K4MSG
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