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Today's Topics:
1. L-7 Gone (Kevin Nathan)
2. Looking for L-75 (Kevin Nathan)
3. TR-4 'bouncing' S-Meter (Paul Gerhardt)
4. Re: TR-4 'bouncing' S-Meter (Garey Barrell)
5. Re: TR-4 'Bouncing' S-Meter (Paul Gerhardt)
6. Re: TR-4 'Bouncing' S-Meter (Paul Gerhardt)
7. Re: TR-4 'Bouncing' S-Meter (john)
8. Drake TR7: Lee Blue Filter Foils (Karl du Roi)
9. Re: Drake TR7: Lee Blue Filter Foils (Tom Evans, AG9X)
----------------------------------------------------------------------
Message: 1
Date: Fri, 15 Apr 2011 11:09:50 -0700
From: "Kevin Nathan" <k...@comcast.net>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] L-7 Gone
Message-ID: <mailman.3065.1302961677.2744.drakel...@zerobeat.net>
Content-Type: text/plain; charset="us-ascii"
Hi All,
Just wanted to let you all know the L-7 has sold. Thanks much. Very 73.
Kevin :)
Amateur Radio: K7RX
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Message: 2
Date: Fri, 15 Apr 2011 11:12:05 -0700
From: "Kevin Nathan" <k...@comcast.net>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] Looking for L-75
Message-ID: <mailman.3066.1302961677.2744.drakel...@zerobeat.net>
Content-Type: text/plain; charset="us-ascii"
Hi All,
Now that the L-7 is gone, anyone on the list have an L-75 you might be
looking to part with? From owning one several years back, I seem to
remember that the band switch and filter caps were weak points. I would
want to be assured both were in sound condition in any L-75 I might
purchase.
Thanks much for reading and very 73.
Kevin :)
Amateur Radio: K7RX
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Message: 3
Date: Fri, 15 Apr 2011 14:24:11 -0400
From: Paul Gerhardt <phgerha...@gmail.com>
To: drakelist@zerobeat.net
Subject: [Drakelist] TR-4 'bouncing' S-Meter
Message-ID: <banlktinnj-nj8zmygnrg3ms_ndaj58i...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
This is a minor issue but is there a cure for excessive 'bouncing' of
the S-Meter? It seems to work normally but with say an S9 signal it
seems to 'bounce' excessivly. Maybe the AVC is not as Slow as it
should be, it is working though, OR is it possible that the Meter
itself has lost some of its 'damping' ability?
Paul on the Eastern Shore
btw pix of the filter on
http://pgerhardt.blogspot.com
On Fri, Apr 15, 2011 at 12:00 PM, <drakelist-requ...@zerobeat.net> wrote:
Send Drakelist mailing list submissions to
? ? ? ?drakelist@zerobeat.net
To subscribe or unsubscribe via the World Wide Web, visit
? ? ? ?http://mailman.zerobeat.net/mailman/listinfo/drakelist
or, via email, send a message with subject or body 'help' to
? ? ? ?drakelist-requ...@zerobeat.net
You can reach the person managing the list at
? ? ? ?drakelist-ow...@zerobeat.net
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Drakelist digest..."
Today's Topics:
? 1. tr-4c s-meter abnormality and reduced sensitivity (Kihwal Lee)
? 2. Re: tr-4c s-meter abnormality and reduced sensitivity
? ? ?(Garey Barrell)
? 3. Re: tr-4c s-meter abnormality and reduced sensitivity (Kihwal Lee)
? 4. Re: tr-4c s-meter abnormality and reduced sensitivity
? ? ?(Garey Barrell)
? 5. Case screws for L4B PS? (Rich Hallman - N7TR)
----------------------------------------------------------------------
Message: 1
Date: Thu, 14 Apr 2011 11:20:49 -0700 (PDT)
From: Kihwal Lee <kih...@yahoo.com>
To: drakelist@zerobeat.net
Subject: [Drakelist] tr-4c s-meter abnormality and reduced sensitivity
Message-ID: <787196.34524...@web81008.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting the
sensitivity and the zero pot won't correct it. I also noticed its reduced
sensitivity compared to other Drakes that I have. The s-meter moves as
expected
when RF gain is lowered. Checked/replaced all tubes. I also checked the
RF gain
pot and it's fine. Resistances and voltages on the V13 12AX7 ?pins seem
okay. I
would appreciate any suggestions.
Kihwal, K9SUL
------------------------------
Message: 2
Date: Thu, 14 Apr 2011 15:29:04 -0400
From: Garey Barrell <k4...@mindspring.com>
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] tr-4c s-meter abnormality and reduced
? ? ? ?sensitivity
Message-ID: <4da74b00.3030...@mindspring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Kihwal -
Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5
VDC.
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
<www.k4oah.com>
Kihwal Lee wrote:
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting
the
sensitivity and the zero pot won't correct it. I also noticed its
reduced
sensitivity compared to other Drakes that I have. The s-meter moves as
expected
when RF gain is lowered. Checked/replaced all tubes. I also checked the
RF gain
pot and it's fine. Resistances and voltages on the V13 12AX7 ?pins seem
okay. I
would appreciate any suggestions.
Kihwal, K9SUL
_______________________________________________
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Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
------------------------------
Message: 3
Date: Thu, 14 Apr 2011 19:15:11 -0500
From: Kihwal Lee <kih...@yahoo.com>
To: "k4...@mindspring.com" <k4...@mindspring.com>
Cc: "drakelist@zerobeat.net" <drakelist@zerobeat.net>
Subject: Re: [Drakelist] tr-4c s-meter abnormality and reduced
? ? ? ?sensitivity
Message-ID: <b636a4e7-ff34-4ac2-8a33-58862deb4...@yahoo.com>
Content-Type: text/plain; ? ? ? charset=us-ascii
It's 290 ohm and the following are the voltage levels.
pin1 0.2v
pin2 12v
pin5 237v
pin6 246v
Probably I should check the R's around the meter as the pin6 voltage
seems a bit high. Any other suggestion?
Thanks
Kihwal K9SUL
On Apr 14, 2011, at 2:29 PM, Garey Barrell <k4...@mindspring.com> wrote:
Kihwal -
Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5
VDC.
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
<www.k4oah.com>
Kihwal Lee wrote:
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting
the
sensitivity and the zero pot won't correct it. I also noticed its
reduced
sensitivity compared to other Drakes that I have. The s-meter moves as
expected
when RF gain is lowered. Checked/replaced all tubes. I also checked the
RF gain
pot and it's fine. Resistances and voltages on the V13 12AX7 ?pins seem
okay. I
would appreciate any suggestions.
Kihwal, K9SUL
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
------------------------------
Message: 4
Date: Thu, 14 Apr 2011 22:23:29 -0400
From: Garey Barrell <k4...@mindspring.com>
To: "drakelist@zerobeat.net" <drakelist@zerobeat.net>
Subject: Re: [Drakelist] tr-4c s-meter abnormality and reduced
? ? ? ?sensitivity
Message-ID: <4da7ac21.6050...@mindspring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Kihwal -
OK. ?Most likely problem is a leaky C212. ?That Cathode (pin 1) voltage
is way too high. ?the stage is drawing ~42 mA rather than the 28 mA it
should be. ?Check R185, and disconnect C212. ?The Cathode voltage should
drop to around 7.5 VDC. ?R92 is about 7% high, so in tolerance, but ...
I suggest replacing R92 and C135 while you're in there!
The Screen (pin 6) is also too high, but that may be a function of a
damaged tube from overcurrent. ?It's possible that you are seeing AC
ripple voltage if the Twist-Lok cap is original. ?You can check for AC
voltage on Pin 6 with AF GAIN full CCW. ?If you read several volts AC
here you'll need to replace C145. ?Replacements for the caps are
available from www.hayseedhamfest.com.
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
<www.k4oah.com>
Kihwal Lee wrote:
It's 290 ohm and the following are the voltage levels.
pin1 0.2v
pin2 12v
pin5 237v
pin6 246v
Probably I should check the R's around the meter as the pin6 voltage
seems a bit high. Any other suggestion?
Thanks
Kihwal K9SUL
On Apr 14, 2011, at 2:29 PM, Garey Barrell<k4...@mindspring.com> ?wrote:
Kihwal -
Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5
VDC.
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
<www.k4oah.com>
Kihwal Lee wrote:
My TR-4C's s-meter points to S-9 under no signal condition. Adjusting
the
sensitivity and the zero pot won't correct it. I also noticed its
reduced
sensitivity compared to other Drakes that I have. The s-meter moves as
expected
when RF gain is lowered. Checked/replaced all tubes. I also checked
the RF gain
pot and it's fine. Resistances and voltages on the V13 12AX7 ?pins
seem okay. I
would appreciate any suggestions.
Kihwal, K9SUL
------------------------------
Message: 5
Date: Thu, 14 Apr 2011 22:16:11 -0700
From: "Rich Hallman - N7TR" <r...@n7tr.com>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] Case screws for L4B PS?
Message-ID:
? ? ? ?<9cd478f256bece4dbe63b1f881bc2ff3212...@exchange-server.n7tr.com>
Content-Type: text/plain; charset="us-ascii"
What size screws are used in the case for a L4B PS? ?Just got a nice
amp...but the screws were missing on the case for the Power Supply?
Thanks...
Rich N7TR
ex KI3V, N3AMK, WB3JOV
www.n7tr.com <http://www.n7tr.com>
Telnet: dxc.n7tr.com N7TR DXCluster
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End of Drakelist Digest, Vol 34, Issue 25
*****************************************
--
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
------------------------------
Message: 4
Date: Fri, 15 Apr 2011 14:53:33 -0400
From: Garey Barrell <k4...@mindspring.com>
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] TR-4 'bouncing' S-Meter
Message-ID: <4da8942d.3010...@mindspring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Paul -
Most likely is leaky C115.
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
<www.k4oah.com>
Paul Gerhardt wrote:
This is a minor issue but is there a cure for excessive 'bouncing' of
the S-Meter? It seems to work normally but with say an S9 signal it
seems to 'bounce' excessivly. Maybe the AVC is not as Slow as it
should be, it is working though, OR is it possible that the Meter
itself has lost some of its 'damping' ability?
------------------------------
Message: 5
Date: Fri, 15 Apr 2011 16:21:07 -0400
From: Paul Gerhardt <phgerha...@gmail.com>
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] TR-4 'Bouncing' S-Meter
Message-ID: <banlktime+tfr6ugvlcfi9k8xrtar_7d...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Not very good quality but a few seconds of the 'Bouncing' S-Meter
While receiving SSB Signal
http://www.facebook.com/video/?id=100001029271897
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
------------------------------
Message: 6
Date: Fri, 15 Apr 2011 18:53:29 -0400
From: Paul Gerhardt <phgerha...@gmail.com>
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] TR-4 'Bouncing' S-Meter
Message-ID: <BANLkTim574kW=t7ahibtdnqs78lk0n8...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Garey
Thanks I put C115 47uf on my parts order. Actually there are several
.47uf's under there so think I will change all of them and the 8uf one
under the Can Cap. Changing some of these helped in the R4B for sure.
Paul -
Most likely is leaky C115.
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
<www.k4oah.com>
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
------------------------------
Message: 7
Date: Fri, 15 Apr 2011 21:07:47 -0400
From: john <joh...@nc.rr.com>
To: Paul Gerhardt <phgerha...@gmail.com>,drakelist@zerobeat.net
Subject: Re: [Drakelist] TR-4 'Bouncing' S-Meter
Message-ID: <6.2.1.2.2.20110415210458.038ff...@pop-server.nc.rr.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I've had one other TR4 where it appeared that the mechanical dampening of
that meter (however that might be implemented ) was faulty. It bounced
much like yours seems to.
I've not spent the time required staring at how those things are made to
determine how it might go bad... but they apparently do.
John K5MO
------------------------------
Message: 8
Date: Sat, 16 Apr 2011 11:59:18 +0200
From: Karl du Roi <dk...@radome.de>
To: drakelist@zerobeat.net
Subject: [Drakelist] Drake TR7: Lee Blue Filter Foils
Message-ID: <201104161159.19269.dk...@radome.de>
Content-Type: Text/Plain; charset="us-ascii"
Good morning,
I am going to swap outaged blue filter foils at my TR7 and RV7 as well. I
found that foils from LEE could be a good solution. I am uncertain if just
blue #079, dark blue #119 or medium blue #132 - or any other - would fit
best.
See the following link for details:
http://www.zilz.de/grosse-rollen-bereich-blau-c-291_1663_1693.html
Has someone experienced what exact colour should be used?
73 de Karl, DK7AL
------------------------------
Message: 9
Date: Sat, 16 Apr 2011 08:47:04 -0500
From: "Tom Evans, AG9X" <tom.a...@gmail.com>
To: Karl du Roi <dk...@radome.de>
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] Drake TR7: Lee Blue Filter Foils
Message-ID: <banlktikgwcb_aokvsj6+gs15j-ubti4...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Try here:
http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/Drake-Tech-Exchange-17.pdf
On Sat, Apr 16, 2011 at 4:59 AM, Karl du Roi <dk...@radome.de> wrote:
Good morning,
I am going to swap outaged blue filter foils at my TR7 and RV7 as well. I
found that foils from LEE could be a good solution. I am uncertain if
just
blue #079, dark blue #119 or medium blue #132 - or any other - would fit
best.
See the following link for details:
http://www.zilz.de/grosse-rollen-bereich-blau-c-291_1663_1693.html
Has someone experienced what exact colour should be used?
73 de Karl, DK7AL
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End of Drakelist Digest, Vol 34, Issue 26
*****************************************
