[Amps] Amps Digest, Vol 95, Issue 33
n1tq at charter.net
n1tq at charter.net
Sun Nov 14 17:51:21 PST 2010
no it is just an empty shell no speaker or grill
Never tell people how to do things. Tell them what to do, and they will
surprise you with their ingenuity.
Gen George S. Patton
On Sun, Nov 14, 2010 at 5:55 PM, amps-request at contesting.com wrote:
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> Today's Topics:
>
> 1. Toshiba tube 7f41R (Allan Greening)
> 2. Re: Blower Source (Roger (sub1))
> 3. Re: Blower Source (Jim W7RY)
> 4. Re: AL-82 Blowing fuses on startup (Jim W7RY)
> 5. Re: WTB RJ1A vacuum relay (Jim W7RY)
> 6. Re: AL-82 Blowing fuses on startup (Gudguyham at aol.com)
> 7. Re: Toshiba tube 7f41R (Alek Petkovic)
> 8. Re: AL-82 Blowing fuses on startup (Carl)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 13 Nov 2010 22:40:33 -0000
> From: "Allan Greening" <vk3pa at vk3pa.com>
> Subject: [Amps] Toshiba tube 7f41R
> To: <Amps at contesting.com>
> Message-ID:
> <20101113224034.COOQ781.nschwotgx04p.mx.bigpond.com at daviddell6400>
> Content-Type: text/plain; charset="us-ascii"
>
> Pse any spec's on 7F41R Tube coaxal type base posable tetrode abt 4
> inches
> dia es 8.5 inches overall length. Has a pair of handles on top hi
> Tu 73 es Dxis vk3pa
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 14 Nov 2010 16:06:29 -0500
> From: "Roger (sub1)" <sub1 at rogerhalstead.com>
> Subject: Re: [Amps] Blower Source
> To: TexasRF at aol.com
> Cc: amps at contesting.com
> Message-ID: <4CE04F55.7040508 at rogerhalstead.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 11/14/2010 6:37 AM, TexasRF at aol.com wrote:
>> Hi Roger, to me, hefty means it can be picked up by hand but elicits
>> a "grunt" in the process.
> Everything is relative. As we get older the scale seems to move and
> I'm not referring to my weight, although that is applicable.
> My Emtron DX-2sp "desktop amp" weighs about 100#. IIRC the transformer
> is about 40-45#. Even at my age I can easily handle both, but not at
> the same time.
>
> It's not that I forget, but rather I often ignore something called
> age. I look at a tower section, transformer, or big extension ladder
> and think "I should get help on this one" and then "but it's not all
> that heavy", go ahead and pick it up and carry it across the shop, or
> out into the woods and then spend the next day laying on the heating
> pad.
>
> I just came in from spending 20 minutes on the back end of a chain
> saw. I didn't get nearly as much done as I had intended, but had
> reached my limit, or rather my back's limit.
>> Ameritron's largest transformer is used in the AL82/1200/1500
>> amplifiers. My AL1500 6m amplifier has a self contained Dahl Hypersil
>> transformer that weighs about 30 pounds or so. It will run the 8877
>> all day long at 1500w out on cw with no problem.
>> The complete amplifier weighs close to 80 pounds and is just about
>> the limit for what I can handle unassisted. Other homebrew amplifiers
>> for VHF weigh even more and need repackaging to have the power supply
>> in a separate cabinet
>> Beyond this, transformers will move into the ultra hefty category,
>> requiring a really firm grip and a more emphatic "gruuuunt" and
>> mumblings about a bear's backside anatomy. This is my personal limit
>> as there is no room for an engine hoist in my shack!
> Innovation...a little time with a cutting torch or plasma torch and
> welder and you can make an overhead hoist so you can pick things up
> and move them around the shack. (A track and trolley down each side of
> the room just under the ceiling and a cross beam with trolley between
> the two trolleys along the walls) A small plasma torch is really
> useful. It'll cut virtually anything and do it neatly. Even the small,
> portable, self contained so called "hobbyist" cutter will cut from
> 1/4" cast iron (try that with a cutting torch<g>), Aluminum, and steel
> down to painted "barn metal" and it can do the barn metal without
> burning the paint...(with a bit of practice). Mig welders are great
> but not worth a darn outside with a bit of a breeze. A tig welder will
> let you even weld that thin barn metal...(with a bit of practice)
>
> The problem is the cost of the raw materials is now several times what
> it was just a couple of years back Copper? Copper was starting to
> look realistic after that huge jump a while back. Last week it took a
> 50% jump.
>
> My shop is 28 X 40 and I keep swearing I'm going to build an overhead
> hoist as there is so much *stuff* in there the only way to move things
> around is to pick them up and move them over everything else. Another
> problem with the 28 X 40' shop is how much material it takes to build
> a hoist that will cover the entire room. It also has to clear the 11
> fluorescent fixtures suspended from the ceiling, and both garage
> doors. The one on the West end of the South side is 8' and the one
> centered on the East end is a 16 footer.
>
> As my wife (N8JBW) says, I suffer from TMS, or "Too
> Much...er....Stuff". You can pick an alternative definition.
> A lot of those projects out there are for her.<:-))
>
> 73
>
> Roger (K8RI)
>> Considering that some tubes we use have handles, maybe we need
>> transformers with handles (and wheels) as well!
>> 73,
>> Gerald K5GW
>> In a message dated 11/14/2010 1:51:00 A.M. Central Standard Time,
>> sub1 at rogerhalstead.com writes:
>>
>> On 11/13/2010 12:31 PM, TexasRF at aol.com wrote:
>>> And usually at better prices as well. Check the price of a hefty
>> plate
>>> transformer for example.
>>>
>>>
>> I dindn't know they had anything big enough to be called hefty.
>> <:-))
>> But they are a good source for parts.
>>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 14 Nov 2010 13:06:52 -0800
> From: "Jim W7RY" <w7ry at inbox.com>
> Subject: Re: [Amps] Blower Source
> To: "Dave M" <slash_dot at msn.com>, <amps at contesting.com>
> Message-ID: <EDA5A641B37247D8B7F4F2A4851658B3 at Laptop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> They have a downloadable catalog.
>
> 73
> Jim W7RY
>
>
>
> --------------------------------------------------
> From: "Dave M" <slash_dot at msn.com>
> Sent: Sunday, November 14, 2010 4:29 AM
> To: <amps at contesting.com>
> Subject: Re: [Amps] Blower Source
>
>>
>> Ameritron may be a good place to get parts but they dont seem to have
>> any online catalogue , pretty much a requirement if you want to
>> compare different offerings and to choose the best for your needs
>>
>> I looked at MFJ , and Ameritron.com but slim pickings oj the 2 sites
>> in the online catalogues available, unless you guys know of another ?
>>
>>
>>
>> ......................................................................................................
>>
>> 73 VE3DV , Dave
>>
>>
>>
>>
>>
>>> From: TexasRF at aol.com
>>> Date: Sun, 14 Nov 2010 06:37:21 -0500
>>> To: sub1 at rogerhalstead.com; amps at contesting.com
>>> Subject: Re: [Amps] Blower Source
>>>
>>> Hi Roger, to me, hefty means it can be picked up by hand but elicits
>>> a
>>> "grunt" in the process.
>>>
>>> Ameritron's largest transformer is used in the AL82/1200/1500
>>> amplifiers.
>>> My AL1500 6m amplifier has a self contained Dahl Hypersil
>>> transformer that
>>> weighs about 30 pounds or so. It will run the 8877 all day long at
>>> 1500w
>>> out on cw with no problem.
>>>
>>> The complete amplifier weighs close to 80 pounds and is just about
>>> the
>>> limit for what I can handle unassisted. Other homebrew amplifiers
>>> for VHF weigh
>>> even more and need repackaging to have the power supply in a
>>> separate
>>> cabinet
>>>
>>> Beyond this, transformers will move into the ultra hefty category,
>>> requiring a really firm grip and a more emphatic "gruuuunt" and
>>> mumblings about a
>>> bear's backside anatomy. This is my personal limit as there is no
>>> room for
>>> an engine hoist in my shack!
>>>
>>> Considering that some tubes we use have handles, maybe we need
>>> transformers
>>> with handles (and wheels) as well!
>>>
>>> 73,
>>> Gerald K5GW
>>>
>>>
>>>
>>>
>>> In a message dated 11/14/2010 1:51:00 A.M. Central Standard Time,
>>> sub1 at rogerhalstead.com writes:
>>>
>>> On 11/13/2010 12:31 PM, TexasRF at aol.com wrote:
>>>> And usually at better prices as well. Check the price of a hefty
>>>> plate
>>>> transformer for example.
>>>>
>>>>
>>> I dindn't know they had anything big enough to be called hefty.
>>> <:-))
>>> But they are a good source for parts.
>>>
>>> 73
>>>
>>> Roger (K8RI)
>>>> 73,
>>>> Gerald K5GW
>>>>
>>>>
>>>>
>>>> In a message dated 11/13/2010 9:22:07 A.M. Central Standard Time,
>>>> km1h at jeremy.mv.com writes:
>>>>
>>>> Way too few realize that Ameritron is a major source of parts to
>>>> all.
>>> It
>>>> doesnt matter what you want it for and its the first place I go.
>>>>
>>>> Carl
>>>> KM1H
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Roland AH6RR"<Toesonnose at hawaii.rr.com>
>>>> To:<amps at contesting.com>
>>>> Sent: Friday, November 12, 2010 11:36 PM
>>>> Subject: [Amps] Blower Source
>>>>
>>>>
>>>>
>>>>> I bought a Pabst blower for a Henry 2KD-5 from Ameritron and it
>>>>> was
>>> only
>>>>> $85
>>>>> bucks new. I had looked online and most sellers wanted $145-175
>>>>> for the
>>>>> same
>>>>> Blower check Ameritron out.
>>>>>
>>>>> Roland AH6RR
>>>>>
>>>>> _______________________________________________
>>>>> 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
>>>>
>>>> _______________________________________________
>>>> 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
>>>
>>> _______________________________________________
>>> 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
>>
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3255 - Release Date:
>> 11/13/10
>>
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 14 Nov 2010 13:35:51 -0800
> From: "Jim W7RY" <w7ry at inbox.com>
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
> To: "Mitch Cox" <ww4cox at embarqmail.com>, "Gary McAdams"
> <g.m.mcadams at comcast.net>, <amps at contesting.com>
> Message-ID: <EFA0BAC6DCC44FC5AE96A92765EBB1CA at Laptop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> If the step start relay were shorted, the fuse is by-passed. In other
> words, the fuse is not in the circuit, it's shorted out by the relay
> contacts.
>
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From: "Mitch Cox" <ww4cox at embarqmail.com>
> Sent: Sunday, November 14, 2010 5:50 AM
> To: "Gary McAdams" <g.m.mcadams at comcast.net>; <amps at contesting.com>
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
>
>> Sounds like the step-start relay is welded. That's where I would
>> start.
>> ----- Original Message ----- From: Gary McAdams
>> To: amps at contesting.com
>> Sent: Sunday, November 14, 2010 8:47 AM
>> Subject: [Amps] AL-82 Blowing fuses on startup
>>
>>
>> Hello Group.
>>
>> Short question: I have an AL-82 that has started to blow a fuse on
>> start-up.
>>
>> It doesn't do it every time, and when the fuse is replaced the unit
>> starts OK and runs all day w/o problems. This all started when I
>> re-arranged the shack. The unit is about two years old.
>>
>> The first time it happened, I checked the AC input at ~248 volts. Is
>> this too high?
>>
>> So, any ideas on what to look for or where to start? As I sit here
>> the
>> amp is on and running, but yesterday I had to replace a fuse to get
>> it
>> started. This is only twice that I've had to replace the fuse, but
>> that's two times too many.
>>
>> 73 Gary WG7X
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3254 - Release Date:
>> 11/13/10
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3255 - Release Date:
>> 11/13/10
>>
>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 14 Nov 2010 13:38:31 -0800
> From: "Jim W7RY" <w7ry at inbox.com>
> Subject: Re: [Amps] WTB RJ1A vacuum relay
> To: <jim at audiosystemsgroup.com>, <amps at contesting.com>
> Message-ID: <D88ECCB597C348BA96F11275409E8CEE at Laptop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Alan Bond, with Max Gain Systems has the best price on new and used
> vacuum relays. Do a Google for Max Gain Systems.
>
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From: "Jim Brown" <jim at audiosystemsgroup.com>
> Sent: Sunday, November 14, 2010 10:15 AM
> To: <amps at contesting.com>
> Subject: Re: [Amps] WTB RJ1A vacuum relay
>
>> On 11/13/2010 9:40 AM, Pete Raymond wrote:
>>> I am looking for a 26.5vdc RJ1A vacuum relay if you have one for
>>> sale please
>>> contact me directly using my above email adr.
>>
>> Gigavac sells their version of these relays to hams at good discounts
>> (about $75 when I last bought about two years ago). One of the Alpha
>> engineers told me that they've been using Gigavac for some time now
>> and
>> have been quite happy with them. I've bought several and have them in
>> the amps I use for lots of contesting. I've also been pleased.
>> Google
>> to find their website.
>>
>> 73, Jim K9YC
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3255 - Release Date:
>> 11/13/10
>>
>
>
> ------------------------------
>
> Message: 6
> Date: Sun, 14 Nov 2010 17:39:45 -0500 (EST)
> From: Gudguyham at aol.com
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
> To: w7ry at inbox.com, ww4cox at embarqmail.com, g.m.mcadams at comcast.net,
> amps at contesting.com
> Message-ID: <22736.4fe34c25.3a11bf31 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Not so Jim
> In a message dated 11/14/2010 3:36:25 P.M. Eastern Standard Time,
> w7ry at inbox.com writes:
>
> If the step start relay were shorted, the fuse is by-passed. In
> other words, the fuse is not in the circuit, it's shorted out by the
> relay contacts.
>
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From: "Mitch Cox" <ww4cox at embarqmail.com>
> Sent: Sunday, November 14, 2010 5:50 AM
> To: "Gary McAdams" <g.m.mcadams at comcast.net>; <amps at contesting.com>
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
>
>> Sounds like the step-start relay is welded. That's where I would
>> start.
>> ----- Original Message ----- From: Gary McAdams
>> To: amps at contesting.com
>> Sent: Sunday, November 14, 2010 8:47 AM
>> Subject: [Amps] AL-82 Blowing fuses on startup
>>
>>
>> Hello Group.
>>
>> Short question: I have an AL-82 that has started to blow a fuse on
>> start-up.
>>
>> It doesn't do it every time, and when the fuse is replaced the unit
>> starts OK and runs all day w/o problems. This all started when I
>> re-arranged the shack. The unit is about two years old.
>>
>> The first time it happened, I checked the AC input at ~248 volts.
>> Is
>> this too high?
>>
>> So, any ideas on what to look for or where to start? As I sit here
>> the
>> amp is on and running, but yesterday I had to replace a fuse to get
>> it
>> started. This is only twice that I've had to replace the fuse, but
>> that's two times too many.
>>
>> 73 Gary WG7X
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3254 - Release Date:
>> 11/13/10
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1153 / Virus Database: 424/3255 - Release Date:
>> 11/13/10
>>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 15 Nov 2010 06:53:37 +0800
> From: Alek Petkovic <vk6apk at bigpond.com>
> Subject: Re: [Amps] Toshiba tube 7f41R
> To: "Allan Greening" <vk3pa at vk3pa.com>,<Amps at contesting.com>
> Message-ID:
>
> <20101114225335.EIVR13035.nschwotgx02p.mx.bigpond.com at MARMION.bigpond.com>
>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> From
> http://homepage2.nifty.com/kawoyama/tubestorymetalseramictransmittigtube.html
>
> Filament, 6.0V/53A
> Max Frequency, 250MHz
> Max Plate V, 4000V
> Max Screen V, 1000V
> Max Plate Current, 2.0A
> Max Plate Dissipation, 3000W
>
> Hsu might have to translate the last 3 columns for you.
>
> 73, Alek.
> VK6APK
>
> At 06:40 AM 14/11/2010, Allan Greening wrote:
>> Pse any spec's on 7F41R Tube coaxal type base posable tetrode abt 4
>> inches
>> dia es 8.5 inches overall length. Has a pair of handles on top hi
>> Tu 73 es Dxis vk3pa
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Sun, 14 Nov 2010 17:55:24 -0500
> From: "Carl" <km1h at jeremy.mv.com>
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
> To: "Jim W7RY" <w7ry at inbox.com>, "Mitch Cox" <ww4cox at embarqmail.com>,
> "Gary McAdams" <g.m.mcadams at comcast.net>, <amps at contesting.com>
> Message-ID: <017801cb844f$07e63000$6501a8c0 at DAVES>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Not according to the schematic.
>
> Carl
> KM1H
>
> ----- Original Message ----- From: "Jim W7RY" <w7ry at inbox.com>
> To: "Mitch Cox" <ww4cox at embarqmail.com>; "Gary McAdams"
> <g.m.mcadams at comcast.net>; <amps at contesting.com>
> Sent: Sunday, November 14, 2010 4:35 PM
> Subject: Re: [Amps] AL-82 Blowing fuses on startup
>
>
>> If the step start relay were shorted, the fuse is by-passed. In
>> other
>> words, the fuse is not in the circuit, it's shorted out by the relay
>> contacts.
>>
>> 73
>> Jim W7RY
>>
>>
>> --------------------------------------------------
>> From: "Mitch Cox" <ww4cox at embarqmail.com>
>> Sent: Sunday, November 14, 2010 5:50 AM
>> To: "Gary McAdams" <g.m.mcadams at comcast.net>; <amps at contesting.com>
>> Subject: Re: [Amps] AL-82 Blowing fuses on startup
>>
>>> Sounds like the step-start relay is welded. That's where I would
>>> start.
>>> ----- Original Message ----- From: Gary McAdams
>>> To: amps at contesting.com
>>> Sent: Sunday, November 14, 2010 8:47 AM
>>> Subject: [Amps] AL-82 Blowing fuses on startup
>>>
>>>
>>> Hello Group.
>>>
>>> Short question: I have an AL-82 that has started to blow a fuse on
>>> start-up.
>>>
>>> It doesn't do it every time, and when the fuse is replaced the unit
>>> starts OK and runs all day w/o problems. This all started when I
>>> re-arranged the shack. The unit is about two years old.
>>>
>>> The first time it happened, I checked the AC input at ~248 volts.
>>> Is
>>> this too high?
>>>
>>> So, any ideas on what to look for or where to start? As I sit here
>>> the
>>> amp is on and running, but yesterday I had to replace a fuse to get
>>> it
>>> started. This is only twice that I've had to replace the fuse, but
>>> that's two times too many.
>>>
>>> 73 Gary WG7X
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>> -----
>>> No virus found in this message.
>>> Checked by AVG - www.avg.com
>>> Version: 10.0.1153 / Virus Database: 424/3254 - Release Date:
>>> 11/13/10
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>>
>>> -----
>>> No virus found in this message.
>>> Checked by AVG - www.avg.com
>>> Version: 10.0.1153 / Virus Database: 424/3255 - Release Date:
>>> 11/13/10
>>>
>> _______________________________________________
>> 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
>
>
> End of Amps Digest, Vol 95, Issue 33
> ************************************
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