** For anode-contactors, I use CF500 long finger stock fastened to the
chimney. It reduces lead L and it facilitates changing tubes. Drawing
thereof:
http://www.somis.org/D.a.11.GIF
>Anyone know a good supplier of annode clips for the 4cx800a/gu74b
>tubes?...Need a lot.
>Thanks
>Tom
>
>
>>From: amps-request@contesting.com
>>Reply-To: amps@contesting.com
>>To: amps@contesting.com
>>Subject: Amps Digest, Vol 14, Issue 2
>>Date: Mon, 2 Feb 2004 09:22:59 -0500 (EST)
>>
>>Send Amps mailing list submissions to
>> amps@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@contesting.com
>>
>>You can reach the person managing the list at
>> amps-owner@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: Re: Amps Digest, Vol 13, Issue 52 (Ed Briggs)
>> 2. Re: BTI (R.Measures)
>> 3. Re: Re: Amps Digest, Vol 13, Issue 52 (R.Measures)
>> 4. Re: Re: matching network (R.Measures)
>> 5. Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z
>> (W0UN -- John Brosnahan)
>> 6. Re: Re: Amps Digest, Vol 13, Issue 52 (Jan Erik Holm)
>> 7. Re: Re: Amps Digest, Vol 13, Issue 52 (David A. Pruett)
>> 8. RE: bird 43 slug (Skram, Helge (MED))
>> 9. RF Deck Amplifier Component Package
>>
>>
>>----------------------------------------------------------------------
>>
>>Date: Sun, 01 Feb 2004 09:43:04 -0500
>>From: Ed Briggs <edbriggs@optonline.net>
>>To: W0UN -- John Brosnahan <shr@swtexas.net>, K3vw@aol.com,
>> amps@contesting.com
>>Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
>>Message-ID: <002401c3e8d1$b37da270$6701a8c0@sonybox>
>>References: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
>>Content-Type: text/plain; charset=iso-8859-1
>>MIME-Version: 1.0
>>Content-Transfer-Encoding: 7BIT
>>Precedence: list
>>Message: 1
>>
>>RF Parts sells 3 different chimneys for the 3-500; the are 4, 4.25, and
>>4.75 inches tall respectively to accomodate (among other things) recessed
>>sockets.
>>
>>Ameritron sells the 3-500 chimney for $22, which is substantially less than
>>the above. This model is also used with a 1200a7 and a recessed socket.
>>
>>Ed
>>----- Original Message -----
>>From: "W0UN -- John Brosnahan" <shr@swtexas.net>
>>To: <K3vw@aol.com>; <amps@contesting.com>
>>Sent: Saturday, January 31, 2004 10:36 PM
>>Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
>>
>>
>> > At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>> >
>> > >You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
>>K3VW
>> >
>> > So, if the Coleman lantern double mantle chimney works with a 4-400A
>> > and that is the same size as a 3-500Z and if the 3-500Z chimney
>> > works on the 3CX1200A7 then it sounds like the Coleman
>> > lantern double mantle chimney should work with a 3CX1200A7.
>> >
>> > Can anyone confirm that this is the case? Don't know the price of
>> > the Coleman lantern chimney these days but it used to be a
>> > relatively inexpensive way to get Pyrex glass for your 4-400As.
>> >
>> > Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>> > chimneys this would be a good thing to know. Except for the
>> > fact that a clear chimney is a real waste with an external anode
>> > tube.
>> >
>> > --John W0UN
>> >
>> >
>>
>>
>>----------------------------------------------------------------------------
>>----
>>
>>
>> >
>> > ---
>> > Outgoing mail is certified Virus Free.
>> > Checked by AVG anti-virus system (http://www.grisoft.com).
>> > Version: 6.0.564 / Virus Database: 356 - Release Date: 1/19/2004
>> >
>>
>>
>>----------------------------------------------------------------------------
>>----
>>
>>
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>------------------------------
>>
>>Date: Sun, 1 Feb 2004 07:11:05 -0800
>>From: R.Measures <r@somis.org>
>>To: "Roger Cranford K5ALU" <k5alu@yahoo.com>,
>> " AMPS" <amps@contesting.com>
>>Subject: [Amps] Re: BTI
>>Message-ID: <20040201151120.564263197BD@dayton.akorn.net>
>>Content-Type: text/plain; charset="US-ASCII"
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 2
>>
>>** The principles for adding 160m to an 80m - 10m amplifier are outlined
>>in:
>>http://www.somis.org/add.160m.html
>>- Unless the bandswitch is toasted from parasitic-arcing, there is no
>>reason to make a BTI into a monobander.
>>
>> >Hi !!
>> >
>> >Do you know of anyone who have modified the old BTI
>> >for 160 meters ?? We have a couple here we want to
>> >single band one for 160.
>> >
>> >Many thanks and 73
>> >de
>> >RED K5ALU
>> >Springfield,MO
>> >
>> >=====
>> >Roger Cranford
>> >K5ALU "RED"
>> >
>> >__________________________________
>> >Do you Yahoo!?
>> >Yahoo! SiteBuilder - Free web site building tool. Try it!
>> >http://webhosting.yahoo.com/ps/sb/
>> >
>>------------------------------
>>
>>Date: Sun, 1 Feb 2004 07:23:35 -0800
>>From: R.Measures <r@somis.org>
>>To: "W0UN -- John Brosnahan" <shr@swtexas.net>, <K3vw@aol.com>,
>> " AMPS" <amps@contesting.com>
>>Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
>>Message-ID: <20040201152349.35BCB31982F@dayton.akorn.net>
>>Content-Type: text/plain; charset="US-ASCII"
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 3
>>
>>
>>
>> >At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>> >
>> >>You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
>>K3VW
>> >
>> >So, if the Coleman lantern double mantle chimney works with a 4-400A
>> >and that is the same size as a 3-500Z and if the 3-500Z chimney
>> >works on the 3CX1200A7 then it sounds like the Coleman
>> >lantern double mantle chimney should work with a 3CX1200A7.
>> >
>> >Can anyone confirm that this is the case? Don't know the price of
>> >the Coleman lantern chimney these days but it used to be a
>> >relatively inexpensive way to get Pyrex glass for your 4-400As.
>> >
>> >Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>> >chimneys this would be a good thing to know. Except for the
>> >fact that a clear chimney is a real waste with an external anode
>> >tube.
>> >
>>** John -- A friend who worked in the broadcast industry told me that
>>tetrodes with handles (such as the 8281) emit blue-light from their
>>ceramic anode insulator. This phenomenon is apparently due to electrons
>>missing the anode, and impacting the ceramic -- which causes
>>flourescence.
>>
>>------------------------------
>>
>>Date: Sun, 1 Feb 2004 07:25:50 -0800
>>From: R.Measures <r@somis.org>
>>To: "Ian White, G3SEK" <g3sek@ifwtech.co.uk>,
>> " AMPS" <amps@contesting.com>
>>Subject: Re: [Amps] Re: matching network
>>Message-ID: <20040201152604.20940319808@dayton.akorn.net>
>>Content-Type: text/plain; charset="US-ASCII"
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 4
>>
>>
>>
>> >R. Measures wrote:
>> >>>>** Ian -- How does one convert this figure into a determination of
>> >>>>how grid current divides between the grid and the screen during g-g
>> >>>>operation?
>> >>>
>> >>>
>> >>>Sorry, maybe what I said was misleading - I'm not sure if it's possible
>> >>>to calculate Ig1/Ig2 in cathode-driven operation directly from mu-g1g2.
>> >>>
>> >>>They both result from the tube's internal tube construction, however,
>> >>>which is why I believe that if one is high, the other will be too.
>> >>>
>> >>** So if a tetrode with a g-/g2 amplification of 4 to 5 has c. 25% of
>> >>total grid current flowing in the screen, a tube with a g/g2
>> >>amplification of 13 might have c. 8% of the total grid-current flowing
>>in
>> >>the screen?
>> >
>> >Couldn't say... you'd have to do a point-by-point analysis using the
>> >characteristic curves.
>> >
>>** Ian -- The sticky wicket is that there are no characteristic curves
>>for 0V on the screen.
>>------------------------------
>>
>>Date: Sun, 01 Feb 2004 09:42:10 -0600
>>From: W0UN -- John Brosnahan <shr@swtexas.net>
>>To: amps@contesting.com
>>Subject: [Amps] Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z
>>Message-ID: <5.2.1.1.2.20040201093613.0292c390@pop3.swtexas.net>
>>In-Reply-To: <002401c3e8d1$b37da270$6701a8c0@sonybox>
>>References: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
>>Content-Type: multipart/mixed; x-avg-checked=avg-ok-6B365C25;
>> boundary="=======F1767DF======="
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 5
>>
>>--=======F1767DF=======
>>Content-Type: text/plain; x-avg-checked=avg-ok-6B365C25; charset=us-ascii;
>> format=flowed
>>Content-Transfer-Encoding: 8bit
>>
>>While at Alpha/Power I learned how easy it is to make the
>>silicon rubber chimneys used in Alpha amps--the only real
>>problem is finding a decent source for the material in
>>small quantities.
>>
>>Just checked out some Coleman replacement chimneys
>>for their double mantle lanterns and the going price is about
>>$8.50. Pretty decent price for a Pyrex chimney for the
>>3-500 and 3XC1200 tubes--assuming it fits OK.
>>
>>Think I will measure my 1200s and see what diameter and
>>height of chimney they require and the next time I go to town
>>I will purchase one to play with.
>>
>>--John W0UN
>>
>>At 08:43 AM 2/1/2004, Ed Briggs wrote:
>>
>> >RF Parts sells 3 different chimneys for the 3-500; the are 4, 4.25, and
>> >4.75 inches tall respectively to accomodate (among other things) recessed
>> >sockets.
>> >
>> >Ameritron sells the 3-500 chimney for $22, which is substantially less
>>than
>> >the above. This model is also used with a 1200a7 and a recessed socket.
>> >
>> >Ed
>>
>>
>>--=======F1767DF=======
>>Content-Type: text/plain; charset=us-ascii; x-avg=cert;
>> x-avg-checked=avg-ok-6B365C25
>>Content-Disposition: inline
>>
>>
>>---
>>Outgoing mail is certified Virus Free.
>>Checked by AVG anti-virus system (http://www.grisoft.com).
>>Version: 6.0.564 / Virus Database: 356 - Release Date: 1/19/2004
>>
>>--=======F1767DF=======--
>>
>>
>>------------------------------
>>
>>Date: Sun, 01 Feb 2004 18:49:56 +0100
>>From: Jan Erik Holm <sm2ekm@telia.com>
>>To: amps@contesting.com
>>Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
>>Message-ID: <401D3C44.2050800@telia.com>
>>In-Reply-To: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
>>References: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
>>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>MIME-Version: 1.0
>>Content-Transfer-Encoding: 8bit
>>Precedence: list
>>Message: 6
>>
>>I checked the Coleman web page but couldn¥t find any
>>chimneys, any clue where to find them? Maybe they are
>>there someplace but I didn¥t spot them.
>>
>>73 Jim SM2EKM
>>------------------------------------------------------
>>
>>W0UN -- John Brosnahan wrote:
>>
>> > At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>> >
>> >> You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does !
>> >> Willy K3VW
>> >
>> >
>> > So, if the Coleman lantern double mantle chimney works with a 4-400A
>> > and that is the same size as a 3-500Z and if the 3-500Z chimney
>> > works on the 3CX1200A7 then it sounds like the Coleman
>> > lantern double mantle chimney should work with a 3CX1200A7.
>> >
>> > Can anyone confirm that this is the case? Don't know the price of
>> > the Coleman lantern chimney these days but it used to be a
>> > relatively inexpensive way to get Pyrex glass for your 4-400As.
>> >
>> > Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>> > chimneys this would be a good thing to know. Except for the
>> > fact that a clear chimney is a real waste with an external anode
>> > tube.
>> >
>> > --John W0UN
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> >
>> > ---
>> > Outgoing mail is certified Virus Free.
>> > Checked by AVG anti-virus system (http://www.grisoft.com).
>> > Version: 6.0.564 / Virus Database: 356 - Release Date: 1/19/2004
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>------------------------------
>>
>>Date: Sun, 01 Feb 2004 14:29:45 -0500
>>From: "David A. Pruett" <k8cc@comcast.net>
>>To: K3vw@aol.com, amps@contesting.com
>>Subject: Re: [Amps] Re: Amps Digest, Vol 13, Issue 52
>>Message-ID: <5.2.1.1.0.20040201142406.00aad3c0@mail.comcast.net>
>>In-Reply-To: <5.2.1.1.2.20040131213134.00b90478@pop3.swtexas.net>
>>References: <c.212ebc8d.2d4d8c9f@aol.com>
>>Content-Type: text/plain; charset="us-ascii"; format=flowed
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 7
>>
>>I don't think a 3-500Z chimney will work with the 3CX1200A7. The *sockets*
>>are the same, but the chimneys aren't. Even Eimac recomments a different
>>chimney part number use with the 3CX1200.
>>
>>I would be very leery of using Coleman lantern chimneys with the
>>3CX1200. The Coleman chimneys I have (acquired along with a pair of
>>4-400As) are essentially just glass cylinders, with no reduction in
>>diameter at the top to direct air at the plate seal. I suspect these work
>>OK with glass tubes by directing the air past the major diameter of the
>>envelope, although the plate seals will be left without direct cooling. In
>>the case of the 3CX1200, the chimney is there to force air through the
>>cooling fins. The Coleman chimneys won't do that very well at all.
>>
>>There may be different Coleman chimneys - I'm just relating what I've seen.
>>
>>Scrimping on chimneys seems to be poor economy to me when you consider the
>>price of tubes.
>>
>>Dave/K8CC
>>
>>
>>At 09:36 PM 1/31/04 -0600, W0UN -- John Brosnahan wrote:
>> >At 04:56 PM 1/31/2004, K3vw@aol.com wrote:
>> >
>> >>You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy
>>K3VW
>> >
>> >So, if the Coleman lantern double mantle chimney works with a 4-400A
>> >and that is the same size as a 3-500Z and if the 3-500Z chimney
>> >works on the 3CX1200A7 then it sounds like the Coleman
>> >lantern double mantle chimney should work with a 3CX1200A7.
>> >
>> >Can anyone confirm that this is the case? Don't know the price of
>> >the Coleman lantern chimney these days but it used to be a
>> >relatively inexpensive way to get Pyrex glass for your 4-400As.
>> >
>> >Since I have a couple of 3CX1200xx tubes (A7 and Z7) but no
>> >chimneys this would be a good thing to know. Except for the
>> >fact that a clear chimney is a real waste with an external anode
>> >tube.
>> >
>> >--John W0UN
>> >
>> >
>> >
>> >
>> >---
>> >Outgoing mail is certified Virus Free.
>> >Checked by AVG anti-virus system (http://www.grisoft.com).
>> >Version: 6.0.564 / Virus Database: 356 - Release Date: 1/19/2004
>> >_______________________________________________
>> >Amps mailing list
>> >Amps@contesting.com
>> >http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>------------------------------
>>
>>Date: Mon, 2 Feb 2004 13:41:56 +0100
>>From: "Skram, Helge (MED)" <helge.skram@med.ge.com>
>>To: RICHARD GEORGE <k6kwq@msn.com>, amps <amps@contesting.com>
>>Subject: RE: [Amps] bird 43 slug
>>Message-ID: <82DBBA91AF7DA44286B33CE67B8C937602CB3D4A@frbucmsx01medge>
>>Content-Type: text/plain;
>> charset="iso-8859-1"
>>MIME-Version: 1.0
>>Precedence: list
>>Message: 8
>>
>>Hello
>>
>>I purchased new from RF Parts one of the Bird 500w 400-1000MHz, that I
>>intended to use on 1296MHz measuring power from a 2x7289 cavity amp.
>>I have 3 Bird 43 meters in use.
>>I stopped using the Bird 500w probe after it was verified to measure low by
>>about 25%. There was also some erratic behaviour at high power levels.
>>Purchased a EME directional coupler from SSB Electronis and this perfomed
>>wery well and according to expectations. However maximum power is limited
>>to
>>200w at 1296MHz. Therefore I now have a 1-4GHz directional coupler from
>>Narda, capable of 500w. This didn't cost me much more than a Bird slug and
>>is highly recomended. Will need diode heads and meter. Was purchased second
>>hand from Stewart of Reading in England.
>>It is correct that the Bird slugs are more broadband at higher power
>>levels.
>>
>>A 1000w 400-1000MHz probe should be reasonable accurate at 1296MHz.
>>A 500w (at least mine) is so so.
>>
>>You can recalibrate the Bird slugs if you dare. There is a small trimpot in
>>the probe that can be adsjusted.
>>Have to remove the cover by heating it with a heatgun.
>>To recalibrate Bird slugs you must have a primary reference with good
>>accuracy.
>>
>>73 de LA6MV
>>Helge
>>
>>
>>-----Original Message-----
>>From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
>>Behalf Of RICHARD GEORGE
>>Sent: 31. januar 2004 03:28
>>To: amps
>>Subject: [Amps] bird 43 slug
>>
>>
>>Has any one ever had Bird make a custom slug for a Bird 43 wattmeter? I
>>need
>>a 500 watt slug for 1296mhz.
>>Thanks
>>
>>
>>
>>
>>K6KWQ Dick "12 Volt radios are for wimps, real radios can kill you" Still
>>can't make it go QRO with "More Power"
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>>------------------------------
>>
>>Date: Mon, 2 Feb 2004 08:03:46 -0500
>>From: w2cqm@juno.com
>>To: Amps@contesting.com
>>Subject: [Amps] RF Deck Amplifier Component Package
>>Message-ID: <20040202.080730.2456.0.W2CQM@juno.com>
>>Content-Type: text/plain
>>MIME-Version: 1.0
>>Content-Transfer-Encoding: 7bit
>>Precedence: list
>>Message: 9
>>
>>Offering essential and difficult to locate components for a homebrew
>>10-80m 1500W amplfier project. Package includes a complete, intact,
>>fully wired silver plated tank/bandswitch assembly. Bandswitch is a high
>>quality porcelain Radio Switch(w/detents) easily reconfigured for up to
>>a 1P8T circuit for switching in additional inductance for WARC bands or
>>160m. Includes a 1" custom HD porcelain high voltage plate choke, wide
>>spaced antenna tune capacitor w/padder, a dual section antenna tune
>>cap, (2) 12V/10w zeners, and a parasitic choke/blocking capacitor. $140+
>>shipping. Ron W2CQM/3
>>------------------------------
>>
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>End of Amps Digest, Vol 14, Issue 2
>>***********************************
>
>
>Tom's Tubes: Specializing in Amateur Radio Amplifier Tubes, Sockets, & G3SEK
>Triode/Tetrode Boards and Kits. http://www.tomstubes.com
>
>_________________________________________________________________
>Scope out the new MSN Plus Internet Software ó optimizes dial-up to the max!
> http://join.msn.com/?pgmarket=en-us&page=byoa/plus&ST=1
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
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