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Today's Topics:
1. Re: amplifier in 1960's QST (Paul Christensen)
2. Re: MFJ products (Jim Thomson)
3. Re: MFJ products (John Bodine)
4. Re: MFJ products (Shon Edwards)
----------------------------------------------------------------------
Message: 1
Date: Mon, 4 Dec 2017 20:54:32 -0500
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Subject: Re: [Amps] amplifier in 1960's QST
Message-ID: <004101d36d6b$ff519020$fdf4b060$@arrl.net>
Content-Type: text/plain; charset="us-ascii"
Possibly the Galaxy 2000+. A full description was authored by Wilfred
Scherer, W2AEF and appears on p. 17 in the January, 1967 issue of CQ
Magazine. A total of <gulp> ten (10) 6HF5 sweep tubes are used in
parallel. The design also makes use of a dynamic linearizer by sampling
input and output RF voltage. Non-linearity produces a voltage that's
then
applied to a series regular in the bias supply.
Paul, W9AC
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Carl
Sent: Monday, December 4, 2017 7:53 PM
To: Fuqua, Bill L <wlfuqu00@uky.edu>; amps@contesting.com
Subject: Re: [Amps] amplifier in 1960's QST
I vaguely remember the article and the tube load was 50 Ohms so there was
no
Load control!!
WRL or Globe had a something 2000 that was all sweep tubes.
Carl
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: <amps@contesting.com>
Sent: Monday, December 04, 2017 12:06 PM
Subject: [Amps] amplifier in 1960's QST
I have been looking for an article about a suitcase kW amplifier using a
load of sweep tubes. directly off power line power supply (voltage
multiplier) and a broadband matching network. Not interested in building
one because there are all sorts of problems with the idea. I think it
was
in late 60's but I can't find it. Perhaps it was not QST.
Anyone remember it?
73
Bill wa4lav
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Message: 2
Date: Tue, 5 Dec 2017 06:44:04 -0800
From: "Jim Thomson" <jim.thom@telus.net>
To: "Shon Edwards" <sre.1966@gmail.com>, "Amplifier Reflector"
<amps@contesting.com>
Subject: Re: [Amps] MFJ products
Message-ID: <3BCC83556CB544E89AB5412DECE378FF@JimPC>
Content-Type: text/plain; charset="UTF-8"
## You forgot to tell us that it was a 40 A 13.8 vdc, switching type
power supply !
Found it on U tube, where the vdc pegged past 16 vdc. Another fellow had
his
way over 45 vdc...and fried his yaesu. The u tube fellow says his did
not have
any over voltage protection built into it ! Since his was under
warranty, MFJ will
repair it..... but not the very expensive yaesu xcvr.
## Fuses on radios will only protect against excess current, not excess
voltage. Your
surge protector on the input of the 120 vac.. feeding the MFJ switching
supply, will not help at all.
The issue is the lack of over voltage protection in the mfj switching
supply, and what ever caused
it to crank out excess vdc in the 1st place... frying everything
connected to it.
## Either replace with a better quality switcher from a different
manufacturer, or use
an analog supply, like a 50 A CCS astron.
## way too many issues with the MFJ-4245 switcher imo. if the supply
bows up, who cares... but when the
same supply blows up a bunch of expensive gear connected to it, then
its a serious issue.
Jim VE7RF
From: Shon Edwards
Sent: Sunday, December 03, 2017 8:42 PM
To: Jim Thomson ; Amplifier Reflector
Subject: Re: [Amps] MFJ products
I know this isn't really an amp question, but I checked my email for
mfj-4245mv and found this one. Last week, the current just took off.
Fried a couple radios whose fuses didn't work. Also my surge protector
didn't stop it from frying my radios. Any idea what caused this or how
to fix it?
Thanks!
de Shon, K6QT
Shon R. Edwards, MA, AG (Czech Republic)
Amateur call: K6QT
1039 N 2575 W
Layton, UT, 84041-7709
USA
Home phone: (801) 444-3445
E-mail: sre.1966@gmail.com
or
Shon Edwards
715 Strawberry Creek Private Rd.
Bedford, WY 83112
Cell: (307) 248-2104
On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net> wrote:
Date: Tue, 11 Sep 2012 10:26:27 +0200
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Subject: Re: [Amps] MFJ products
My 5 cents worth:
I own and use several pieces of MFJ equipment, much of it has been in
daily use for more than 10years:
a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
more than 10years
a MFJ-259B antenna analyzer, without a doubt the most useful tool
in my toolbox
I know there are better/more accurate/higher quality analyzers
available now - at vastly higher prices!
this one has been in use for more than 10 years in my shack and
in the field, and when I broke it
(my own fault - reverse polarity) MFJ was very helpful with
repair suggestions
I owned a MFJ-969 tuner for several years - did exactly what it was
supposed to do at a very reasonable price
Various power meters an dummy loads - again they have been
performing exactly as expected.
To conclude: yes corners have been cut here and there, but at the prices
asked you get fair usefulness and many times equipment which few of us
could afford without MFJ supplying it.
--
Vy 73 de OZ1PIF/5Q2M, Peter
## You obviously have not tried one of their SS HF linear amps..like
the
AL-600 or AL-1300. I defy anybody to get one to run full bore for 5
years
straight.
Jim VE7RF.
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------------------------------
Message: 3
Date: Tue, 5 Dec 2017 09:49:53 -0500
From: John Bodine <john.bodine@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] MFJ products
Message-ID:
<CAFJ4jdbxR9TzoR+cKKXLUX7nuq-d9sPnQBF6CKKe1zx_xWWTvA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Long ago I removed all adjustable voltage supplies from the shack because
a
bump or a grandchild can break your heart(cook your transceiver).
On Tue, Dec 5, 2017 at 9:44 AM, Jim Thomson <jim.thom@telus.net> wrote:
## You forgot to tell us that it was a 40 A 13.8 vdc, switching type
power supply !
Found it on U tube, where the vdc pegged past 16 vdc. Another fellow
had
his
way over 45 vdc...and fried his yaesu. The u tube fellow says his
did
not have
any over voltage protection built into it ! Since his was under
warranty, MFJ will
repair it..... but not the very expensive yaesu xcvr.
## Fuses on radios will only protect against excess current, not
excess
voltage. Your
surge protector on the input of the 120 vac.. feeding the MFJ switching
supply, will not help at all.
The issue is the lack of over voltage protection in the mfj switching
supply, and what ever caused
it to crank out excess vdc in the 1st place... frying everything
connected to it.
## Either replace with a better quality switcher from a different
manufacturer, or use
an analog supply, like a 50 A CCS astron.
## way too many issues with the MFJ-4245 switcher imo. if the supply
bows up, who cares... but when the
same supply blows up a bunch of expensive gear connected to it, then
its
a serious issue.
Jim VE7RF
From: Shon Edwards
Sent: Sunday, December 03, 2017 8:42 PM
To: Jim Thomson ; Amplifier Reflector
Subject: Re: [Amps] MFJ products
I know this isn't really an amp question, but I checked my email for
mfj-4245mv and found this one. Last week, the current just took off.
Fried a couple radios whose fuses didn't work. Also my surge protector
didn't stop it from frying my radios. Any idea what caused this or how
to
fix it?
Thanks!
de Shon, K6QT
Shon R. Edwards, MA, AG (Czech Republic)
Amateur call: K6QT
1039 N 2575 W
Layton, UT, 84041-7709
USA
Home phone: (801) 444-3445
E-mail: sre.1966@gmail.com
or
Shon Edwards
715 Strawberry Creek Private Rd.
Bedford, WY 83112
Cell: (307) 248-2104
On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net> wrote:
Date: Tue, 11 Sep 2012 10:26:27 +0200
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Subject: Re: [Amps] MFJ products
My 5 cents worth:
I own and use several pieces of MFJ equipment, much of it has been in
daily use for more than 10years:
a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
more than 10years
a MFJ-259B antenna analyzer, without a doubt the most useful tool
in my toolbox
I know there are better/more accurate/higher quality analyzers
available now - at vastly higher prices!
this one has been in use for more than 10 years in my shack and
in the field, and when I broke it
(my own fault - reverse polarity) MFJ was very helpful with
repair suggestions
I owned a MFJ-969 tuner for several years - did exactly what it was
supposed to do at a very reasonable price
Various power meters an dummy loads - again they have been
performing exactly as expected.
To conclude: yes corners have been cut here and there, but at the
prices
asked you get fair usefulness and many times equipment which few of us
could afford without MFJ supplying it.
--
Vy 73 de OZ1PIF/5Q2M, Peter
## You obviously have not tried one of their SS HF linear amps..like
the
AL-600 or AL-1300. I defy anybody to get one to run full bore for 5
years
straight.
Jim VE7RF.
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--
Later,
John Bodine/WU2E
------------------------------
Message: 4
Date: Tue, 5 Dec 2017 08:03:12 -0700
From: Shon Edwards <sre.1966@gmail.com>
To: Jim Thomson <jim.thom@telus.net>, Amplifier Reflector
<amps@contesting.com>
Subject: Re: [Amps] MFJ products
Message-ID:
<CAC3=1e-Degve6SV_XXb0tbM8V-tQstLw=JXtJb5KrdMcCu-r=w@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Thanks Jim and everyone else (and the sympathies). Sorry I neglected to
give all the info. Yes, it's a mystery to me why all happened just as it
did. No matter how low I switched the DC Adjust dial (9-15 V), it just
pegged itself it seemed even a bit higher than the max.
Shon R. Edwards, MA, AG (Czech Republic)
Amateur call: K6QT
1039 N 2575 W
Layton, UT, 84041-7709
USA
Home phone: (801) 444-3445
E-mail: sre.1966@gmail.com
or
Shon Edwards
715 Strawberry Creek Private Rd.
Bedford, WY 83112
Cell: (307) 248-2104
On Tue, Dec 5, 2017 at 7:44 AM, Jim Thomson <jim.thom@telus.net> wrote:
## You forgot to tell us that it was a 40 A 13.8 vdc, switching type
power supply !
Found it on U tube, where the vdc pegged past 16 vdc. Another fellow
had
his
way over 45 vdc...and fried his yaesu. The u tube fellow says his
did
not have
any over voltage protection built into it ! Since his was under
warranty, MFJ will
repair it..... but not the very expensive yaesu xcvr.
## Fuses on radios will only protect against excess current, not
excess
voltage. Your
surge protector on the input of the 120 vac.. feeding the MFJ switching
supply, will not help at all.
The issue is the lack of over voltage protection in the mfj switching
supply, and what ever caused
it to crank out excess vdc in the 1st place... frying everything
connected to it.
## Either replace with a better quality switcher from a different
manufacturer, or use
an analog supply, like a 50 A CCS astron.
## way too many issues with the MFJ-4245 switcher imo. if the supply
bows up, who cares... but when the
same supply blows up a bunch of expensive gear connected to it, then
its
a serious issue.
Jim VE7RF
*From:* Shon Edwards
*Sent:* Sunday, December 03, 2017 8:42 PM
*To:* Jim Thomson ; Amplifier Reflector
*Subject:* Re: [Amps] MFJ products
I know this isn't really an amp question, but I checked my email for
mfj-4245mv and found this one. Last week, the current just took off.
Fried a couple radios whose fuses didn't work. Also my surge protector
didn't stop it from frying my radios. Any idea what caused this or how
to
fix it?
Thanks!
de Shon, K6QT
Shon R. Edwards, MA, AG (Czech Republic)
Amateur call: K6QT
1039 N 2575 W
<https://maps.google.com/?q=1039+N+2575+W+Layton,+UT,+%0D+84041&entry=gmail&source=g>
Layton, UT, 84041-7709
USA
Home phone: (801) 444-3445
E-mail: sre.1966@gmail.com
or
Shon Edwards
715 Strawberry Creek Private Rd.
<https://maps.google.com/?q=715+Strawberry+Creek+Private+Rd.%0D+Bedford,+WY+83112&entry=gmail&source=g>
Bedford, WY 83112
<https://maps.google.com/?q=715+Strawberry+Creek+Private+Rd.%0D+Bedford,+WY+83112&entry=gmail&source=g>
Cell: (307) 248-2104
On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net>
wrote:
Date: Tue, 11 Sep 2012 10:26:27 +0200
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Subject: Re: [Amps] MFJ products
My 5 cents worth:
I own and use several pieces of MFJ equipment, much of it has been in
daily use for more than 10years:
a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
more than 10years
a MFJ-259B antenna analyzer, without a doubt the most useful tool
in my toolbox
I know there are better/more accurate/higher quality analyzers
available now - at vastly higher prices!
this one has been in use for more than 10 years in my shack and
in the field, and when I broke it
(my own fault - reverse polarity) MFJ was very helpful with
repair suggestions
I owned a MFJ-969 tuner for several years - did exactly what it was
supposed to do at a very reasonable price
Various power meters an dummy loads - again they have been
performing exactly as expected.
To conclude: yes corners have been cut here and there, but at the
prices
asked you get fair usefulness and many times equipment which few of us
could afford without MFJ supplying it.
--
Vy 73 de OZ1PIF/5Q2M, Peter
## You obviously have not tried one of their SS HF linear amps..like
the
AL-600 or AL-1300. I defy anybody to get one to run full bore for 5
years
straight.
Jim VE7RF.
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Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
------------------------------
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