[Amps] Amps Digest, Vol 96, Issue 48
Jim W7RY
w7ry at inbox.com
Thu Dec 23 17:59:06 PST 2010
The diode in this amp on the filter cap board shorted. That caused the grid
and plate current meters to read the same. Just the plate current divided on
the two meters.
Jim W7RY
--------------------------------------------------
From: "Ron Spencer" <n4vos at bellsouth.net>
Sent: Thursday, December 23, 2010 5:36 PM
To: <amps at contesting.com>
Subject: Re: [Amps] Amps Digest, Vol 96, Issue 48
> Re AL-1500 Plate Meter Circuit
>
> Might want to check a diode on the filter cap board its a 1n4007 I had a
> meter problem on a AL-1200 and the diode was open causing it to have
> higher
> readings that normal
>
> Ron
>
> ----- Original Message -----
> From: <amps-request at contesting.com>
> To: <amps at contesting.com>
> Sent: Thursday, December 23, 2010 7:20 PM
> Subject: Amps Digest, Vol 96, Issue 48
>
>
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>> Today's Topics:
>>
>> 1. Re: TenTec Centurion - 422 tuning question (Lee Buller)
>> 2. AL-1500 Plate Meter Circuit (Jim W7RY)
>> 3. Re: AL-1500 Plate Meter Circuit (Jim W7RY)
>> 4. Re: AL-1500 Plate Meter Circuit (Dave Hachadorian)
>> 5. Re: AL-1500 Plate Meter Circuit (Gudguyham at aol.com)
>> 6. Re: TenTec Centurion - 422 tuning question (Gudguyham at aol.com)
>> 7. Re: TenTec Centurion - 422 tuning question (Alek Petkovic)
>> 8. Re: TenTec Centurion - 422 tuning question (Gudguyham at aol.com)
>> 9. Re: TenTec Centurion - 422 tuning question (Jim Brown)
>> 10. Re: AL-1500 Plate Meter Circuit (Jim W7RY)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 23 Dec 2010 12:11:45 -0800 (PST)
>> From: Lee Buller <k0wa at swbell.net>
>> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
>> To: bemeier <bemeier at bellsouth.net>, amps at contesting.com
>> Message-ID: <525103.1408.qm at web81303.mail.mud.yahoo.com>
>> Content-Type: text/plain; charset=us-ascii
>>
>> Hi Lee,
>>
>> My first resuorce was to Ten Tec. They stated exactly what I thought
>> they
>> would. The amps have been in production for years and they work fine.
>> Must
>> be a problem with mine. If I want them to look at it - ship it to
>> Tennessee.
>>
>> That may be the end result, but not my desired solution.
>>
>> 73,Bruce
>>
>>
>> Well, isn't that great customer service. NOT! I am not sure that I
>> would
>> run a
>> company like that. Well, then I would assume that something is "broke"
>> or
>> out
>> of spec somewhere. As people have been writing here, seems that there
>> are
>> some
>> components to check to see if they are defective or out of tolerance(?).
>>
>> I am sure that there is a solution....after all...it is a "simple" pi-net
>> and
>> should work.
>>
>> Lee - K0WA
>>
>>
>> In our day and age it seems that Common Sense is in short supply. If you
>> don't
>> have any Common Sense - get some Common Sense and use it. If you can't
>> find any
>> Common Sense, ask for help from somebody who has some Common Sense. Is
>> Common
>> Sense divine?
>>
>> Common Sense is the image of the Creator expressing revealed truth in my
>> mind.
>> - John W. (Kansas)
>>
>>
>>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Thu, 23 Dec 2010 13:04:59 -0800
>> From: "Jim W7RY" <w7ry at inbox.com>
>> Subject: [Amps] AL-1500 Plate Meter Circuit
>> To: "AMPS" <amps at contesting.com>
>> Message-ID: <C50FFB079339432D8FEA24CB21EE65E6 at Laptop>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Merry Christmas!
>> I'm working on a AL-1500. I noticed that the is only one 1.5 Ohm resistor
>> in the plate metering circuit. The schematic calls for two 1.5 Ohm
>> resistors (R3 and R4).
>>
>> The plate current seems just a bit high. With 1500 watts out, plate
>> current is about 975 ma @ 2900 volts. I really believe the amp is a bit
>> more efficient than this.
>>
>> Ideas?
>> Thanks
>> 73
>> Jim W7RY
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Thu, 23 Dec 2010 13:07:08 -0800
>> From: "Jim W7RY" <w7ry at inbox.com>
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>> To: "Jim W7RY" <w7ry at inbox.com>, "AMPS" <amps at contesting.com>
>> Message-ID: <5C9B28A4CA6341C3BFD21AAF2311EB80 at Laptop>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> Looking a little closer at the schematic, R3 and R4 are grid meter
>> resistors. The grid current is very low about 50 ma for 1500 watts out.
>>
>> Thanks
>> 73
>> Jim W7RY
>>
>>
>>
>> --------------------------------------------------
>> From: "Jim W7RY" <w7ry at inbox.com>
>> Sent: Thursday, December 23, 2010 1:04 PM
>> To: "AMPS" <amps at contesting.com>
>> Subject: [Amps] AL-1500 Plate Meter Circuit
>>
>>> Merry Christmas!
>>> I'm working on a AL-1500. I noticed that the is only one 1.5 Ohm
>>> resistor
>>> in the plate metering circuit. The schematic calls for two 1.5 Ohm
>>> resistors (R3 and R4).
>>>
>>> The plate current seems just a bit high. With 1500 watts out, plate
>>> current is about 975 ma @ 2900 volts. I really believe the amp is a bit
>>> more efficient than this.
>>>
>>> Ideas?
>>> Thanks
>>> 73
>>> Jim W7RY
>>> _______________________________________________
>>> 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: 10.0.1170 / Virus Database: 1435/3333 - Release Date: 12/23/10
>>>
>>
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Thu, 23 Dec 2010 14:24:24 -0700
>> From: "Dave Hachadorian" <k6ll at arrl.net>
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>> To: "Jim W7RY" <w7ry at inbox.com>, <amps at contesting.com>
>> Message-ID: <E9F73FDCDD844374891591C8185F140C at Acer>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> Page 9 of the instructions says, "The final grid current should
>> be around 50 mA and the plate current below 1000 mA."
>>
>> By the way, the power output meter in the AL-1500 is not a real
>> wattmeter, and can be quite inaccurate.
>>
>>
>> Dave Hachadorian, K6LL
>> Yuma, AZ
>>
>>
>>
>> -----Original Message-----
>> From: Jim W7RY
>> Sent: Thursday, December 23, 2010 2:07 PM
>> To: Jim W7RY ; AMPS
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>>
>> Looking a little closer at the schematic, R3 and R4 are grid
>> meter
>> resistors. The grid current is very low about 50 ma for 1500
>> watts out.
>>
>> Thanks
>> 73
>> Jim W7RY
>>
>>
>>
>> --------------------------------------------------
>> From: "Jim W7RY" <w7ry at inbox.com>
>> Sent: Thursday, December 23, 2010 1:04 PM
>> To: "AMPS" <amps at contesting.com>
>> Subject: [Amps] AL-1500 Plate Meter Circuit
>>
>>> Merry Christmas!
>>> I'm working on a AL-1500. I noticed that the is only one 1.5
>>> Ohm resistor
>>> in the plate metering circuit. The schematic calls for two 1.5
>>> Ohm
>>> resistors (R3 and R4).
>>>
>>> The plate current seems just a bit high. With 1500 watts out,
>>> plate
>>> current is about 975 ma @ 2900 volts. I really believe the amp
>>> is a bit
>>> more efficient than this.
>>>
>>> Ideas?
>>> Thanks
>>> 73
>>> Jim W7RY
>>> _______________________________________________
>>> 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: 10.0.1170 / Virus Database: 1435/3333 - Release Date:
>>> 12/23/10
>>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Thu, 23 Dec 2010 17:44:42 -0500 (EST)
>> From: Gudguyham at aol.com
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>> To: w7ry at inbox.com, amps at contesting.com
>> Message-ID: <6158c.28fa2cc.3a452ad9 at aol.com>
>> Content-Type: text/plain; charset="US-ASCII"
>>
>> The AL-1500 uses the same metering board as the 1200 and 82, they both
>> use
>> 2 resistors because the full scale is 400ma on the grid. The AL-1500 has
>> a
>> 200ma FS so hence the one resistor. Your amp is correct. The AL-1500
>> usually runs about 20ma grid at 1500 out if the tube is real good. As
>> the
>> tube gets older it draws more grid current. Sounds like your OK. The
>> output
>> meter is very inaccurate, don't go by it. Lou
>>
>>
>> In a message dated 12/23/2010 4:05:15 P.M. Eastern Standard Time,
>> w7ry at inbox.com writes:
>>
>> Merry Christmas!
>> I'm working on a AL-1500. I noticed that the is only one 1.5 Ohm
>> resistor
>> in the plate metering circuit. The schematic calls for two 1.5 Ohm
>> resistors (R3 and R4).
>>
>> The plate current seems just a bit high. With 1500 watts out, plate
>> current is about 975 ma @ 2900 volts. I really believe the amp is a bit
>> more
>> efficient than this.
>>
>> Ideas?
>> Thanks
>> 73
>> Jim W7RY
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> ------------------------------
>>
>> Message: 6
>> Date: Thu, 23 Dec 2010 17:46:38 -0500 (EST)
>> From: Gudguyham at aol.com
>> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
>> To: k0wa at swbell.net, bemeier at bellsouth.net, amps at contesting.com
>> Message-ID: <61730.13001f6.3a452b4e at aol.com>
>> Content-Type: text/plain; charset="US-ASCII"
>>
>> I am still confused about 10 being full capacity. The dial could have
>> been put on wrong.
>>
>>
>> In a message dated 12/23/2010 3:12:03 P.M. Eastern Standard Time,
>> k0wa at swbell.net writes:
>>
>> Hi Lee,
>>
>> My first resuorce was to Ten Tec. They stated exactly what I thought
>> they
>> would. The amps have been in production for years and they work fine.
>> Must
>> be a problem with mine. If I want them to look at it - ship it to
>> Tennessee.
>>
>> That may be the end result, but not my desired solution.
>>
>> 73,Bruce
>>
>>
>> Well, isn't that great customer service. NOT! I am not sure that I
>> would
>> run a
>> company like that. Well, then I would assume that something is "broke"
>> or
>> out
>> of spec somewhere. As people have been writing here, seems that there
>> are
>> some
>> components to check to see if they are defective or out of tolerance(?).
>>
>> I am sure that there is a solution....after all...it is a "simple"
>> pi-net
>> and
>> should work.
>>
>> Lee - K0WA
>>
>>
>> In our day and age it seems that Common Sense is in short supply. If
>> you
>> don't
>> have any Common Sense - get some Common Sense and use it. If you can't
>> find any
>> Common Sense, ask for help from somebody who has some Common Sense. Is
>> Common
>> Sense divine?
>>
>> Common Sense is the image of the Creator expressing revealed truth in my
>> mind.
>> - John W. (Kansas)
>>
>>
>>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> ------------------------------
>>
>> Message: 7
>> Date: Fri, 24 Dec 2010 06:53:24 +0800
>> From: Alek Petkovic <vk6apk at bigpond.com>
>> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
>> To: amps at contesting.com
>> Message-ID:
>> <20101223225326.IUCN25056.nskntotgx01p.mx.bigpond.com at MARMION.bigpond.com>
>>
>> Content-Type: text/plain; charset="us-ascii"; format=flowed
>>
>> Confusing indeed. I noticed the same thing with the Emtron DX-2SP at
>> my club. Turning the knob to the right increases capacitance.
>>
>> I guess it doesn't really matter a great deal. It is just unconventional.
>>
>> 73, Alek
>> VK6APK
>>
>>
>> At 06:46 AM 24/12/2010, Gudguyham at aol.com wrote:
>>>I am still confused about 10 being full capacity. The dial could have
>>>been put on wrong.
>>>
>>>
>>>In a message dated 12/23/2010 3:12:03 P.M. Eastern Standard Time,
>>>k0wa at swbell.net writes:
>>>
>>>Hi Lee,
>>>
>>>My first resuorce was to Ten Tec. They stated exactly what I thought
>>>they
>>>would. The amps have been in production for years and they work fine.
>>>Must
>>>be a problem with mine. If I want them to look at it - ship it to
>>>Tennessee.
>>>
>>>That may be the end result, but not my desired solution.
>>>
>>>73,Bruce
>>>
>>>
>>>Well, isn't that great customer service. NOT! I am not sure that I
>>>would
>>>run a
>>>company like that. Well, then I would assume that something is "broke"
>>>or
>>>out
>>>of spec somewhere. As people have been writing here, seems that there
>>>are
>>> some
>>>components to check to see if they are defective or out of tolerance(?).
>>>
>>>I am sure that there is a solution....after all...it is a "simple"
>>>pi-net
>>>and
>>>should work.
>>>
>>>Lee - K0WA
>>>
>>>
>>>In our day and age it seems that Common Sense is in short supply. If
>>>you
>>>don't
>>>have any Common Sense - get some Common Sense and use it. If you can't
>>>find any
>>>Common Sense, ask for help from somebody who has some Common Sense. Is
>>>Common
>>>Sense divine?
>>>
>>>Common Sense is the image of the Creator expressing revealed truth in my
>>>mind.
>>>- John W. (Kansas)
>>>
>>>
>>> >
>>>_______________________________________________
>>>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
>>
>>
>> http://www.qrz.com/db/vk6apk
>> http://www.qrz.com/db/vk6ap
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 8
>> Date: Thu, 23 Dec 2010 17:55:30 -0500 (EST)
>> From: Gudguyham at aol.com
>> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
>> To: vk6apk at bigpond.com, amps at contesting.com
>> Message-ID: <61e34.30021b62.3a452d62 at aol.com>
>> Content-Type: text/plain; charset="US-ASCII"
>>
>>
>>
>> In a message dated 12/23/2010 5:53:47 P.M. Eastern Standard Time,
>> vk6apk at bigpond.com writes:
>>
>> I guess it doesn't really matter a great deal. It is just
>> unconventional.
>>
>> 73, Alek
>>
>> It matters if the dial is on wrong and you go by the manual for initial
>> settings. NO?
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 9
>> Date: Thu, 23 Dec 2010 15:29:08 -0800
>> From: Jim Brown <jim at audiosystemsgroup.com>
>> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
>> To: amps at contesting.com
>> Message-ID: <4D13DB44.1080206 at audiosystemsgroup.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> On 12/23/2010 2:53 PM, Alek Petkovic wrote:
>>> Confusing indeed. I noticed the same thing with the Emtron DX-2SP at
>>> my club. Turning the knob to the right increases capacitance.
>>
>> This seems to be the way Ten Tec power amps are set up. My Titans,
>> vintage 1980, are also set up that way.
>>
>> n 12/23/2010 2:46 PM, Gudguyham at aol.com wrote:
>>> I am still confused about 10 being full capacity. The dial could have
>>> been put on wrong.
>>
>> So take the cover off and look at it! That's what I did. End of
>> confusion. :)
>>
>> It's also quite easy to change, simply by taking the knob off and
>> re-seating to zero at max capacity. Now capacitance will be minimum at
>> 10.
>>
>> It's also important to realize that a pi-network is an impedance
>> matching network. So changing the value of the capacitors changes the
>> match between the output impedance of the tubes and the connected
>> transmission line.
>>
>> 73, Jim K9YC
>>
>>
>> ------------------------------
>>
>> Message: 10
>> Date: Thu, 23 Dec 2010 16:20:32 -0800
>> From: "Jim W7RY" <w7ry at inbox.com>
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>> To: "Dave Hachadorian" <k6ll at arrl.net>, <amps at contesting.com>
>> Message-ID: <603F5381531F4A238A95D758CCBC6EC2 at Laptop>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=response
>>
>> I know about the wattmeter Dave. I'm using a Powermaster.
>>
>> I actually answered my own question. The grid current being half of what
>> it
>> shows on the meter. So with my setup, the grid current is actually only
>> about 25 ma which is about right.
>>
>> Thanks
>> 73
>> Merry Christmas!
>> Jim W7RY
>>
>>
>>
>> --------------------------------------------------
>> From: "Dave Hachadorian" <k6ll at arrl.net>
>> Sent: Thursday, December 23, 2010 1:24 PM
>> To: "Jim W7RY" <w7ry at inbox.com>; <amps at contesting.com>
>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>>
>>> Page 9 of the instructions says, "The final grid current should be
>>> around
>>> 50 mA and the plate current below 1000 mA."
>>>
>>> By the way, the power output meter in the AL-1500 is not a real
>>> wattmeter,
>>> and can be quite inaccurate.
>>>
>>>
>>> Dave Hachadorian, K6LL
>>> Yuma, AZ
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Jim W7RY
>>> Sent: Thursday, December 23, 2010 2:07 PM
>>> To: Jim W7RY ; AMPS
>>> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>>>
>>> Looking a little closer at the schematic, R3 and R4 are grid meter
>>> resistors. The grid current is very low about 50 ma for 1500 watts out.
>>>
>>> Thanks
>>> 73
>>> Jim W7RY
>>>
>>>
>>>
>>> --------------------------------------------------
>>> From: "Jim W7RY" <w7ry at inbox.com>
>>> Sent: Thursday, December 23, 2010 1:04 PM
>>> To: "AMPS" <amps at contesting.com>
>>> Subject: [Amps] AL-1500 Plate Meter Circuit
>>>
>>>> Merry Christmas!
>>>> I'm working on a AL-1500. I noticed that the is only one 1.5 Ohm
>>>> resistor
>>>> in the plate metering circuit. The schematic calls for two 1.5 Ohm
>>>> resistors (R3 and R4).
>>>>
>>>> The plate current seems just a bit high. With 1500 watts out, plate
>>>> current is about 975 ma @ 2900 volts. I really believe the amp is a bit
>>>> more efficient than this.
>>>>
>>>> Ideas?
>>>> Thanks
>>>> 73
>>>> Jim W7RY
>>>> _______________________________________________
>>>> 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: 10.0.1170 / Virus Database: 1435/3333 - Release Date: 12/23/10
>>>>
>>> _______________________________________________
>>> 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: 10.0.1170 / Virus Database: 1435/3333 - Release Date: 12/23/10
>>>
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> End of Amps Digest, Vol 96, Issue 48
>> ************************************
>
> _______________________________________________
> 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: 10.0.1170 / Virus Database: 1435/3334 - Release Date: 12/23/10
>
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