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@contesting.com>
To: <amps@contesting.com>
Sent: Thursday, December 23, 2010 7:20 PM
Subject: Amps Digest, Vol 96, Issue 48
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> Today's Topics:
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> 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@aol.com)
> 6. Re: TenTec Centurion - 422 tuning question (Gudguyham@aol.com)
> 7. Re: TenTec Centurion - 422 tuning question (Alek Petkovic)
> 8. Re: TenTec Centurion - 422 tuning question (Gudguyham@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@swbell.net>
> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
> To: bemeier <bemeier@bellsouth.net>, amps@contesting.com
> Message-ID: <525103.1408.qm@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@inbox.com>
> Subject: [Amps] AL-1500 Plate Meter Circuit
> To: "AMPS" <amps@contesting.com>
> Message-ID: <C50FFB079339432D8FEA24CB21EE65E6@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@inbox.com>
> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
> To: "Jim W7RY" <w7ry@inbox.com>, "AMPS" <amps@contesting.com>
> Message-ID: <5C9B28A4CA6341C3BFD21AAF2311EB80@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@inbox.com>
> Sent: Thursday, December 23, 2010 1:04 PM
> To: "AMPS" <amps@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@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@arrl.net>
> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
> To: "Jim W7RY" <w7ry@inbox.com>, <amps@contesting.com>
> Message-ID: <E9F73FDCDD844374891591C8185F140C@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@inbox.com>
> Sent: Thursday, December 23, 2010 1:04 PM
> To: "AMPS" <amps@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@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 23 Dec 2010 17:44:42 -0500 (EST)
> From: Gudguyham@aol.com
> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
> To: w7ry@inbox.com, amps@contesting.com
> Message-ID: <6158c.28fa2cc.3a452ad9@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@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 23 Dec 2010 17:46:38 -0500 (EST)
> From: Gudguyham@aol.com
> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
> To: k0wa@swbell.net, bemeier@bellsouth.net, amps@contesting.com
> Message-ID: <61730.13001f6.3a452b4e@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@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 7
> Date: Fri, 24 Dec 2010 06:53:24 +0800
> From: Alek Petkovic <vk6apk@bigpond.com>
> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
> To: amps@contesting.com
> Message-ID:
> <20101223225326.IUCN25056.nskntotgx01p.mx.bigpond.com@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@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@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@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>>
>>_______________________________________________
>>Amps mailing list
>>Amps@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@aol.com
> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
> To: vk6apk@bigpond.com, amps@contesting.com
> Message-ID: <61e34.30021b62.3a452d62@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@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@audiosystemsgroup.com>
> Subject: Re: [Amps] TenTec Centurion - 422 tuning question
> To: amps@contesting.com
> Message-ID: <4D13DB44.1080206@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@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@inbox.com>
> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
> To: "Dave Hachadorian" <k6ll@arrl.net>, <amps@contesting.com>
> Message-ID: <603F5381531F4A238A95D758CCBC6EC2@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@arrl.net>
> Sent: Thursday, December 23, 2010 1:24 PM
> To: "Jim W7RY" <w7ry@inbox.com>; <amps@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@inbox.com>
>> Sent: Thursday, December 23, 2010 1:04 PM
>> To: "AMPS" <amps@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@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@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> End of Amps Digest, Vol 96, Issue 48
> ************************************
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