- Original Message -
From: "Jim Shorney"
To:
Sent: Wednesday, July 06, 2011 9:16 PM
Subject: Re: [Drakelist] D104 and TR7
On Wed, 6 Jul 2011 22:26:44 -0500, Grant Youngman wrote:
That's true. But if one has an amplified stand it will
work fine, too.
Better without. It's extra g
Dieter,
This is a standard "Jones" connector, formerly made by Cinch. I purchased one
from, I think, Digi-Key several years ago. I don't know if this particular
connector is still in production, but there should still be NOS available at
one or more of the major parts suppliers.
73
-Jim
On Wed
On Wed, 6 Jul 2011 21:33:11 -0400, Paul Christensen wrote:
>You can add a 100K resistor in the D104's + mic lead. That will help to
>unload the crystal element from the TR-7's moderately low input Z.
Note: if the high level input pin is used, the load is 470K + the low level
impedance. I use
On Wed, 6 Jul 2011 21:23:08 -0500, Grant Youngman wrote:
>Why wouldn't you use the preamp?
Because you don't need it, and it can cause more trouble than it's worth.
>The preamp eliminates the need to be concerned about matching the input Z of
>the radio and eliminates the effect of the input Z
On Wed, 6 Jul 2011 22:26:44 -0500, Grant Youngman wrote:
>That's true. But if one has an amplified stand it will work fine, too.
Better without. It's extra gain that is not needed, and it adds another failure
point and a point for feedback and distortion to enter. I've gotten excellent
results b
On Wed, 6 Jul 2011 21:40:29 -0500, Woody wrote:
>I have used D104's for many years on all my rigs, as a matter of a fact that's
>all I own, I have mine mounted on a boom, I hate to hold the darn things. This
>is the only time I have ever had a problem with one, and I have the amp tuned
>all the
That's true. But if one has an amplified stand it will work fine, too.
Sent from my iPhone
On Jul 6, 2011, at 10:13 PM, K9sqg wrote:
> Grant,
>
> There is no real need for the pre-amp circuit when the D-104 is used with the
> TR-7, more than enough gain exists. Don't have to replace the bat
444D -- hamfest, e-whatever. Not expensive. Great mic with a TR-7.
Sent from my iPhone
On Jul 6, 2011, at 9:40 PM, Woody wrote:
> I clipping. So I'm trying to find a cure without going to a 7075 for close to
> a hundred bucks and having to hold it.
> Woody
> --
>
>
> _
*I have used D104's for many years on all my rigs, as a matter of a fact
that's all I own, I have mine mounted on a boom, I hate to hold the darn
things. This is the only time I have ever had a problem with one, and I have
the amp tuned all the way down and then just barely cracked it and the mic
g
Why wouldn't you use the preamp? While there may be better preamp circuits out
there, even the preamp in an amplified Astatic stand sounds decent if it's used
properly. Turn it all the way down. Set the rig's mic gain at about 10:00, and
then SLOWLY advance the gain of the preamp for normal mod
Woody,
I've heard of numerous people using the D-104 with the TR-7 as discussed on the
Drake nets. Values I've heard range from 470K to 1.3 meg in series with the
mic hot lead. If there is a speech pre-amp in the mic, it should not be used.
73,
Evan, K9SQG
-Original Message-
Woody,
You can add a 100K resistor in the D104's + mic lead. That will help to unload
the crystal element from the TR-7's moderately low input Z. Same is true if
your D104 uses Astatic's 2-transistor preamp/buffer circuit. The input Z of
Astatic's preamp is still too low to take full advanta
*Does any one know the mod to make the 104 work well with the TR7, I was
told you added a **resistor of some value but they didn't know the value or
where to put it. I need to know it at the Mod's for Dummies level, I was a
Toolmaker not a electronics man, well just enough to be dangerous and stay
I should add that another shortcoming of the 2B is that it cannot receive below
3.5 mhz without a special low frequency converter. That's a shame because it
seems this would be a great set for BCB DXing.
Here are some details on the converter:
http://www.dproducts.be/drake_museum/2-lf1.htm
I
OK, guys, I have been using my Drake 2B as a general-coverage receiver for a
week now and I wanted to report back on my experiences. This is a receiver that
you folks helped me out with about a month ago. To repair it, I had to install
a 6BF6 tube (easily obtained) and replace the filter cap can
Rob Sherwood just sent me the data below, confirming my finding that AC flux
induction is worse on the R-4C PTO when the VFO is run up top where the
ferrite core extends furthest to the rear of the receiver. Notice the 13 dB
difference in modulated PTO 60 Hz sidebands between VFO extremes.
Ro
Gentlemen,
I am currently after an L7 missing the power supply. It will not be a
big problem to build a decent p/s but will I be able to get that 8-pole
connector? Especially here in Germany it is probably hard to get. Can
you give me some sourcing hint?
Thanks and 73
Dieter "Sam" DL5RDO
T
Jake -
Some do, some don't. I think it is a function of the warm-up times of the various tubes involved,
primarily V1, V4 and V5. They're all specified as 11 second warm-up, but the precise point where
they just begin to conduct can vary slightly. Once warmed-up, you should be able to adjust
- Original Message -
From:
To:
Sent: Wednesday, July 06, 2011 7:43 AM
Subject: Re: [Drakelist] R-4C Cabinet Bumpers
To Add to Paul's Request I am also looking for several
bumper replacements.
I have not found a source for these as of yet and would
appreciate any advice from the g
I'd start by replacing V5 if you have a spare. If not, just swap with V4. If no effect, replace V1
and/or V4. If still no luck, we'll have to make some measurements in and around Q4.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
r
Hello all,
I'm new to the world of Drakes and have a question re: possible normal
v. abnormal behavior.
Several months ago I purchased a R-4B. After re-capping the radio
works wonderfully, and is a joy to use. My question: when I first turn
it on and place it in standby to warm-up, the S-meter mo
To Add to Paul's Request I am also looking for several bumper replacements.
I have not found a source for these as of yet and would appreciate any advice
from the group.
Thank-you
Wade, VA3HM
> From: w...@arrl.net
> To: drakelist@zerobeat.net
> Date: Tue, 5 Jul 2011 17:56:33 -0400
> Subject: [
With my R4A s/n 6759, have distortion of a sideband signal when RF gain control
at maximum, AVC on "fast". CW signal is normal, and there is no distortion
with the AVC off or on "slow" or with RF gain lower. I'm recalling the AVC
setup can be difficult to get right, appreciate any advice befor
Mu metal can be found in some old TVs (not all), oscilloscopes, etc. at low to
free prices...
-Original Message-
From: Paul Christensen
To: Drakelist group
Sent: Wed, Jul 6, 2011 7:26 am
Subject: [Drakelist] R-4C Power Transformer Rotation
As promised, here's my update concerning
As promised, here's my update concerning the R-4C power transformer and PTO
modulation. First a special thanks to Bill, W6FF for providing me with a
NOS R-4C transformer. Very much appreciated. However, a rare occurrence of
good fortune came to me. It turns out that the existing R-4C transfo
Garey,
Thanks for the tip. I did check with John, but no luck. However, I may
have found an alternative. Newark has Plastic Snap Rivets that may work.
http://www.newark.com/jsp/content/printCatalog.jsp?cat=catalog128&page=2137&display=single
I'll order a pack and try them. Seems like miss
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