[Amps] Amps Digest, Vol 101, Issue 19
W8HW
w8hw at att.net
Mon May 16 07:28:33 PDT 2011
Hello Vic,
Regards to your question about series filaments:
I have not used the tubes you speak of, but have used and serviced several
amps using the 3-500. In every case the filaments were in series. The thing
you must remember is that a center tap transformer is required. The reason
for this is that no two tubes are alike. Each filament will be a little
different, thus the voltage (without center tap) would not be half of the
total voltage. that would mean that one of the tubes would have higher
voltage thus burn out sooner because of voltage stress. The only current
that travels through the Center tap is the "difference" and not the total
current. Very important consideration. Hope this helps. If you need to ask
me more, please feel free to email me direct.
73, Bruce, W8HW
I BUY or SERVICE broke radios
On May 15, 2011, at 14:11, Vic K2VCO <vic at rakefet.com> wrote:
> I'm planning a 2 x 4-400A amp. I wonder if it would be possible to connect
> the filaments
> in series and use a 10v 15a transformer?
>
> If I do this, I guess the DC return would be the common point where the
> filaments are
> connected to each other. Is that correct?
>
> Are there reasons that this would be a bad idea?
> --
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
----- Original Message -----
From: <amps-request at contesting.com>
To: <amps at contesting.com>
Sent: Monday, May 16, 2011 1:16 AM
Subject: Amps Digest, Vol 101, Issue 19
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> Today's Topics:
>
> 1. Re: Filaments in series (Robrk)
> 2. Re: gs35b 144mhz (Carl)
> 3. Re: Filaments in series (Carl)
> 4. Commander HF 1250 (George Steube)
> 5. Dayton? (Donald Fox)
> 6. Re: Dayton? (Gudguyham at aol.com)
> 7. Re: Commander HF 1250 (Gudguyham at aol.com)
> 8. gs35b 144mhz (Carey Lockhart, KC5GTT)
> 9. Re: gs35b 144mhz (Carey Lockhart, KC5GTT)
> 10. 3 phase transformer (Ronald Brown)
> 11. Re: 3 phase transformer (jeff millar)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 15 May 2011 15:39:39 -0400
> From: Robrk <robrk at nidhog.net>
> Subject: Re: [Amps] Filaments in series
> To: Vic K2VCO <vic at rakefet.com>
> Cc: Amps reflector <amps at contesting.com>
> Message-ID: <91AF3A6D-9675-489B-A330-1968BC8A0805 at nidhog.net>
> Content-Type: text/plain; charset=us-ascii
>
> Go find the Henry manuals. All the 2k's did it.
>
>
>
>
> On May 15, 2011, at 14:11, Vic K2VCO <vic at rakefet.com> wrote:
>
>> I'm planning a 2 x 4-400A amp. I wonder if it would be possible to
>> connect the filaments
>> in series and use a 10v 15a transformer?
>>
>> If I do this, I guess the DC return would be the common point where the
>> filaments are
>> connected to each other. Is that correct?
>>
>> Are there reasons that this would be a bad idea?
>> --
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> --
>> This message has been scanned for viruses and
>> dangerous content by MailScanner, and is
>> believed to be clean.
>>
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 15 May 2011 15:41:43 -0400
> From: "Carl" <km1h at jeremy.mv.com>
> Subject: Re: [Amps] gs35b 144mhz
> To: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>, <amps at contesting.com>
> Message-ID: <BCBB85D8D15A4D1E8FD5CE6C3F671E68 at computer1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> You consider 35% efficiency working great? You probably cooked the tube by
> now.
>
> I get 60% from a 3CX1000A7 split line for over 25 years.
>
> Carl
> KM1H
>
> ----- Original Message -----
> From: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>
> To: <amps at contesting.com>
> Sent: Monday, March 14, 2011 7:22 PM
> Subject: [Amps] gs35b 144mhz
>
>
>> Hello all,
>>
>> i built a yu1aw 2 meter gs-35 amplifier about 8 months ago. been working
>> great. just recently i can here my voice coming from the cavity. also the
>> tube seems to be glowing a much brighter blue than before. with the
>> lights
>> out i can not see any arcing. the amp is running the following
>>
>> plate voltage 4100 no load
>> plate voltage 4600 full load
>> plate current 1.0a full load
>> bias -30v
>> output 1450 on diawa cn801hp
>>
>> any ideas would be appreciated.
>>
>> Carey, kc5gtt
>> _______________________________________________
>> 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: 10.0.1375 / Virus Database: 1500/3639 - Release Date: 05/15/11
>>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 15 May 2011 15:46:41 -0400
> From: "Carl" <km1h at jeremy.mv.com>
> Subject: Re: [Amps] Filaments in series
> To: "Vic K2VCO" <vic at rakefet.com>, "Amps reflector"
> <amps at contesting.com>
> Message-ID: <F7F3063C3A32466EB62E395A3BD3DDDB at computer1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Correct, look at the TL-922 for ideas
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Vic K2VCO" <vic at rakefet.com>
> To: "Amps reflector" <amps at contesting.com>
> Sent: Sunday, May 15, 2011 2:11 PM
> Subject: [Amps] Filaments in series
>
>
>> I'm planning a 2 x 4-400A amp. I wonder if it would be possible to
>> connect
>> the filaments
>> in series and use a 10v 15a transformer?
>>
>> If I do this, I guess the DC return would be the common point where the
>> filaments are
>> connected to each other. Is that correct?
>>
>> Are there reasons that this would be a bad idea?
>> --
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
>> _______________________________________________
>> 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: 10.0.1375 / Virus Database: 1500/3639 - Release Date: 05/15/11
>>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 15 May 2011 17:49:44 -0500
> From: "George Steube" <at6c at bellsouth.net>
> Subject: [Amps] Commander HF 1250
> To: <amps at contesting.com>
> Message-ID: <OAEFLIMKHDILAKGOALAMCEOLGHAA.at6c at bellsouth.net>
> Content-Type: text/plain; charset="iso-8859-1"
>
> The voltmeter on my HF 1250 stop working. I looked at the schematic and
> the amplifier and wow not the easiest to work on. The B+ voltage is fine
> at
> 2800 but no readings on the meter. Looking at schematic it show a
> resistor
> voltage divider going to the switch (the schematic is missing some
> connections and it's not clear about some of the interconnections since
> the
> different sheets have different names). Where are these resistors, it
> looks
> like they might be under the RF deck, but that would require disassembly
> of
> the whole amp chassis. Anyone who has worked on one these I sure could
> use
> a hint before I start taking every thing apart. Also if anyone has a
> better
> schematic than the one in the manual I would appreciate that. Thanks.
> George
> W2GS
>
> ------------------------------
>
> Message: 5
> Date: Sun, 15 May 2011 16:23:47 -0700 (PDT)
> From: Donald Fox <taurusshoguy at yahoo.com>
> Subject: [Amps] Dayton?
> To: amps at contesting.com
> Message-ID: <119097.49638.qm at web161904.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Gentlemen:
>
> I will also be in Dayton at spaces 1554, 1555, 1556.
>
> I had the pleasure of meeting Lou W1QJ a few years back. It might be nice
> to pick a gathering spot for those here who might wish to put a face or
> handshake with the call sign.
>
> ??????????????????????????????????????????????????????? Don??? N8ECH
>
>
> ------------------------------
>
> Message: 6
> Date: Sun, 15 May 2011 19:26:39 -0400 (EDT)
> From: Gudguyham at aol.com
> Subject: Re: [Amps] Dayton?
> To: taurusshoguy at yahoo.com, amps at contesting.com
> Message-ID: <eae3.127aab99.3b01bb2f at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Good Idea Don, I will be at space 1943-44. Stop by. Lou W1QJ
>
>
> In a message dated 5/15/2011 7:23:58 P.M. Eastern Daylight Time,
> taurusshoguy at yahoo.com writes:
>
> Gentlemen:
>
> I will also be in Dayton at spaces 1554, 1555, 1556.
>
> I had the pleasure of meeting Lou W1QJ a few years back. It might be nice
> to pick a gathering spot for those here who might wish to put a face or
> handshake with the call sign.
>
> Don N8ECH
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> ------------------------------
>
> Message: 7
> Date: Sun, 15 May 2011 19:30:07 -0400 (EDT)
> From: Gudguyham at aol.com
> Subject: Re: [Amps] Commander HF 1250
> To: at6c at bellsouth.net, amps at contesting.com
> Message-ID: <ec9e.68addf15.3b01bbff at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Yes, that is where they are George. Probably an open 1 meg resistor in
> the string. Be sure the meter didn't go on you. Tap it with an ohm
> meter in
> high scale and see if it responds. If it does then it is either a bad
> connection, the switch or a series divider resistor. They do open due to
> the
> high Vdrop across them,
>
>
> In a message dated 5/15/2011 6:50:03 P.M. Eastern Daylight Time,
> at6c at bellsouth.net writes:
>
> The voltmeter on my HF 1250 stop working. I looked at the schematic
> and
> the amplifier and wow not the easiest to work on. The B+ voltage is fine
> at
> 2800 but no readings on the meter. Looking at schematic it show a
> resistor
> voltage divider going to the switch (the schematic is missing some
> connections and it's not clear about some of the interconnections since
> the
> different sheets have different names). Where are these resistors, it
> looks
> like they might be under the RF deck, but that would require disassembly
> of
> the whole amp chassis. Anyone who has worked on one these I sure could
> use
> a hint before I start taking every thing apart. Also if anyone has a
> better
> schematic than the one in the manual I would appreciate that. Thanks.
> George
> W2GS
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 8
> Date: Tue, 15 Mar 2011 09:22:41 -0500
> From: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>
> Subject: [Amps] gs35b 144mhz
> To: <amps at contesting.com>
> Message-ID: <E3743EF57E124FE89478C117F97C9B78 at careychbqjio7i>
> Content-Type: text/plain; charset="iso-8859-1"
>
> your right Carl i did cook the tube. last night the voices stoped HI. i
> have never been able to get the operating values that yu1aw states on his
> diagrams.
>
> i am somewhat a novice builder as you all can see. i have orderd a new
> tube and will try again. maybe i need to change the design i am trying to
> use. not sure.
>
> thanks for the input guys. i am sure if no one minds i will be back once
> the new tube gets here.
>
> Carey, kc5gtt
>
> ------------------------------
>
> Message: 9
> Date: Tue, 15 Mar 2011 09:34:08 -0500
> From: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>
> Subject: Re: [Amps] gs35b 144mhz
> To: <amps at contesting.com>, "Fuqua, Bill L" <wlfuqu00 at uky.edu>
> Message-ID: <41B97765700B4CEC86452D1E054C8157 at careychbqjio7i>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> i do have some on each end of the fillimate chokes but thats about it. the
> sound WAS comming from the cavity its self. had major meltdown. lost many
> components. have most of it fixed now but tube is a goner
>
> i do have some photos on my web site at kc5gtt.com. thanks again to the
> list.
>
> Carey, kc5gtt
>
>
> ----- Original Message -----
> From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
> To: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>
> Sent: Sunday, May 15, 2011 1:45 PM
> Subject: RE: [Amps] gs35b 144mhz
>
>
> I see no problem as long as it is your own voice you are hearing. Other
> wise
> contact SYFY channel.
> Those are very high plate currents. Especially the no-load one and for
> the output power.
> Is that normal operation or your abnormal operation.
> Do you have any ceramic disc capacitors anywhere in the ckt for
> bypassing?
> Sometimes they can speak to you.
>
> 73
> Bill wa4lav
>
> ________________________________________
> From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf
> Of
> Carey Lockhart, KC5GTT [kc5gtt at gmail.com]
> Sent: Monday, March 14, 2011 7:22 PM
> To: amps at contesting.com
> Subject: [Amps] gs35b 144mhz
>
> Hello all,
>
> i built a yu1aw 2 meter gs-35 amplifier about 8 months ago. been working
> great. just recently i can here my voice coming from the cavity. also the
> tube seems to be glowing a much brighter blue than before. with the lights
> out i can not see any arcing. the amp is running the following
>
> plate voltage 4100 no load
> plate voltage 4600 full load
> plate current 1.0a full load
> bias -30v
> output 1450 on diawa cn801hp
>
> any ideas would be appreciated.
>
> Carey, kc5gtt
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> ------------------------------
>
> Message: 10
> Date: Sun, 15 May 2011 21:49:34 -0700 (PDT)
> From: Ronald Brown <rg52brown at yahoo.com>
> Subject: [Amps] 3 phase transformer
> To: amps at contesting.com
> Message-ID: <674357.99697.qm at web114713.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> I have a 3 phase plate transformer I want to use on single phase.? It has
> 3 separate sections and the secondaries can be separated.? Can I just
> parallel them up ??? I realize core limitations will play into this but is
> there any problem with just paralleling up all three sections?
>
> ron - K0idx
>
>
>
> ------------------------------
>
> Message: 11
> Date: Mon, 16 May 2011 01:16:29 -0400
> From: jeff millar <jeff at wa1hco.net>
> Subject: Re: [Amps] 3 phase transformer
> To: amps at contesting.com
> Message-ID: <4DD0B32D.4050308 at wa1hco.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> If you parallel all the windings, the magnetic fields all have the same
> polarity
> and block each other. It's as if you cut the loop formed by the
> laminations.
>
> I think what you want to do is to apply power to the two outer primary
> windings
> and leave the middle windings disconnected. This forces all the flux
> through
> the middle laminations. Then you can take the output from the two outer
> secondaries. Just leave the middle disconnected.
>
> I did some experiments with this on a 3 phase 48V transformer and it
> appeared to
> work well. This should work with any combination of series or parallel on
> primary and secondary...but you have to consider voltage breakdown.
>
> jeff, wa1hco
>
> On 05/16/2011 12:49 AM, Ronald Brown wrote:
>> I have a 3 phase plate transformer I want to use on single phase. It has
>> 3 separate sections and the secondaries can be separated. Can I just
>> parallel them up ? I realize core limitations will play into this but
>> is there any problem with just paralleling up all three sections?
>>
>> ron - K0idx
>>
>> _______________________________________________
>> 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 101, Issue 19
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