[Amps] Multi tube amp
Roger (K8RI)
k8ri at rogerhalstead.com
Tue Dec 12 02:23:18 EST 2017
Find the transformers used in the old, tube type color RV sets. Many of
them will power 200W out (or more). So you need a few transformers and
they aren't as plentiful as in the past, but a passel of them will
provide power for Carl's suggestion.
IIRC the old Dentron GLA1000 used 6 sweep tubes for 800 to 100 watts
out. It's been so long I've forgotten the tubes or power.
Over working the elements certainly does shorten tube life and usually
raises IMD.
You need look no farther than amplifiers claiming more output power than
the tubes are rared to handle and the complaints about short tube life.
Those were more simple days even if we were limited to 1KW DC input.
73, Roger (K8RI)
On 12/11/2017 Monday 9:51 AM, Carl wrote:
> Even if it was possible pushing the INTERNAL parts that hard would
> radically shorten life.
>
> Why not use a variety of oddball filament voltage BIG sweep tubes that
> are still dirt cheap NIB at hamfests, etc? For the lower bands each
> one can be a different version as long as the Pd is the same or close.
> Filaments can be run right off the AC line in series parallel with
> balancing resistors if needed.
>
> Eight 35W tubes equal 4 811A's at about half the plate voltage making
> the PS cheaper. Use a surplus 120 to 240V step up transformer and a
> tripler, those go begging at electronic surplus shops, hamfests and
> Fleabay, etc.
>
> Another choice is the 4D32 with plenty still available after the USAF
> released thousands into the surplus market. There are only 3 ham TX
> that used them that I'm aware of:; Collins 32V series, Hallicrafters
> HT-20, and Johnson Viking I and they last a long time there.
>
> Run 4 in swamped grid AB2 or Super Cathode driven for an easy 600W out
> at ~ 750V.
>
> Lets all do more building
>
> Carl
> ----- Original Message ----- From: "Gary Schafer"
> <garyschafer at largeriver.net>
> To: "'Herbert Schoenbohm'" <herbert.schoenbohm at gmail.com>; "'KA9EGW'"
> <ka9egw at ka9egw.com>; <amps at contesting.com>
> Sent: Sunday, December 10, 2017 5:48 PM
> Subject: Re: [Amps] Multi tube amp
>
>
>> That's been done with 6AG7's but a 6L6 won't work in GG because it
>> has an
>> internal connected beam forming element/suppressor.
>>
>> 73
>> Gary K4FMX
>>
>>> -----Original Message-----
>>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Herbert
>>> Schoenbohm
>>> Sent: Wednesday, December 06, 2017 7:08 AM
>>> To: KA9EGW; amps at contesting.com
>>> Subject: Re: [Amps] Multi tube amp
>>>
>>> If you can get some metal 6L6's for a reasonable price at a flee
>>> market,
>>> you can turn the amp upside down and place it in a large pan of water
>>> and
>>> really run some power to a bunch of them. A true HB water cooled amp
>>> with
>>> a very low plate impedance and low drive requirements.
>>>
>>> Herb, KV4FZ
>>>
>>> On Tue, Dec 5, 2017 at 5:32 PM, KA9EGW <ka9egw at ka9egw.com> wrote:
>>>
>>> > Seems to me there was also one in strays that use something like a
>>> dozen
>>> > 1625's on parallel
>>> >
>>> > Sent from my device that creates typos
>>> >
>>> > > On Dec 5, 2017, at 09:05, amps-request at contesting.com wrote:
>>> > >
>>> > > Send Amps mailing list submissions to
>>> > > amps at contesting.com
>>> > >
>>> > > To subscribe or unsubscribe via the World Wide Web, visit
>>> > > http://lists.contesting.com/mailman/listinfo/amps
>>> > > or, via email, send a message with subject or body 'help' to
>>> > > amps-request at contesting.com
>>> > >
>>> > > You can reach the person managing the list at
>>> > > amps-owner at contesting.com
>>> > >
>>> > > When replying, please edit your Subject line so it is more specific
>>> > > than "Re: Contents of Amps digest..."
>>> > >
>>> > >
>>> > > 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 at arrl.net>
>>> > > To: <amps at 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 at contesting.com] On Behalf Of Carl
>>> > > Sent: Monday, December 4, 2017 7:53 PM
>>> > > To: Fuqua, Bill L <wlfuqu00 at uky.edu>; amps at 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 at uky.edu>
>>> > > To: <amps at 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
>>> > >>
>>> > >> _______________________________________________
>>> > >> Amps mailing list
>>> > >> Amps at contesting.com
>>> > >> http://lists.contesting.com/mailman/listinfo/amps
>>> > >
>>> > >
>>> > > ---
>>> > > This email has been checked for viruses by AVG.
>>> > > http://www.avg.com
>>> > >
>>> > > _______________________________________________
>>> > > Amps mailing list
>>> > > Amps at contesting.com
>>> > > http://lists.contesting.com/mailman/listinfo/amps
>>> > >
>>> > >
>>> > >
>>> > > ------------------------------
>>> > >
>>> > > Message: 2
>>> > > Date: Tue, 5 Dec 2017 06:44:04 -0800
>>> > > From: "Jim Thomson" <jim.thom at telus.net>
>>> > > To: "Shon Edwards" <sre.1966 at gmail.com>, "Amplifier Reflector"
>>> > > <amps at contesting.com>
>>> > > Subject: Re: [Amps] MFJ products
>>> > > Message-ID: <3BCC83556CB544E89AB5412DECE378FF at 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 at 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 at telus.net>
>>> wrote:
>>> > >
>>> > > Date: Tue, 11 Sep 2012 10:26:27 +0200
>>> > > From: "Peter Frenning [OZ1PIF]" <peter at 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.
>>> > >
>>> > >
>>> > > _______________________________________________
>>> > > Amps mailing list
>>> > > Amps at contesting.com
>>> > > http://lists.contesting.com/mailman/listinfo/amps
>>> > >
>>> > >
>>> > >
>>> > > ------------------------------
>>> > >
>>> > > Message: 3
>>> > > Date: Tue, 5 Dec 2017 09:49:53 -0500
>>> > > From: John Bodine <john.bodine at gmail.com>
>>> > > To: amps at contesting.com
>>> > > Subject: Re: [Amps] MFJ products
>>> > > Message-ID:
>>> > > <CAFJ4jdbxR9TzoR+cKKXLUX7nuq-
>>> d9sPnQBF6CKKe1zx_xWWTvA at 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 at 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 at 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 at telus.net>
>>> > wrote:
>>> > >>
>>> > >> Date: Tue, 11 Sep 2012 10:26:27 +0200
>>> > >> From: "Peter Frenning [OZ1PIF]" <peter at 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.
>>> > >>
>>> > >>
>>> > >> _______________________________________________
>>> > >> Amps mailing list
>>> > >> Amps at contesting.com
>>> > >> http://lists.contesting.com/mailman/listinfo/amps
>>> > >>
>>> > >> _______________________________________________
>>> > >> Amps mailing list
>>> > >> Amps at contesting.com
>>> > >> http://lists.contesting.com/mailman/listinfo/amps
>>> > >>
>>> > >
>>> > >
>>> > >
>>> > > --
>>> > >
>>> > > Later,
>>> > > John Bodine/WU2E
>>> > >
>>> > >
>>> > > ------------------------------
>>> > >
>>> > > Message: 4
>>> > > Date: Tue, 5 Dec 2017 08:03:12 -0700
>>> > > From: Shon Edwards <sre.1966 at gmail.com>
>>> > > To: Jim Thomson <jim.thom at telus.net>, Amplifier Reflector
>>> > > <amps at contesting.com>
>>> > > Subject: Re: [Amps] MFJ products
>>> > > Message-ID:
>>> > > <CAC3=1e-Degve6SV_XXb0tbM8V-tQstLw=JXtJb5KrdMcCu-
>>> r=w at 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 at 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 at 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 at 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 at telus.net>
>>> > wrote:
>>> > >>>
>>> > >>> Date: Tue, 11 Sep 2012 10:26:27 +0200
>>> > >>> From: "Peter Frenning [OZ1PIF]" <peter at 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.
>>> > >>>
>>> > >>> _______________________________________________
>>> > >>> Amps mailing list
>>> > >>> Amps at contesting.com
>>> > >>> http://lists.contesting.com/mailman/listinfo/amps
>>> > >>>
>>> > >>
>>> > >>
>>> > >
>>> > >
>>> > > ------------------------------
>>> > >
>>> > > Subject: Digest Footer
>>> > >
>>> > > _______________________________________________
>>> > > Amps mailing list
>>> > > Amps at contesting.com
>>> > > http://lists.contesting.com/mailman/listinfo/amps
>>> > >
>>> > >
>>> > > ------------------------------
>>> > >
>>> > > End of Amps Digest, Vol 180, Issue 6
>>> > > ************************************
>>> >
>>> > _______________________________________________
>>> > Amps mailing list
>>> > Amps at contesting.com
>>> > http://lists.contesting.com/mailman/listinfo/amps
>>> >
>>> _______________________________________________
>>> Amps mailing list
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--
Roger (K8RI)
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