hello,
can i help you.
On 10/4/05, amps-request@contesting.com <amps-request@contesting.com> wrote:
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> Today's Topics:
>
> 1. Plate Choke Alternatives (wc6w@juno.com)
> 2. help needed sorting out a tube rectifier circuit
> (chris@yipyap.com)
> 3. Re: Is cleanliness next to God-liness? (R.Measures)
> 4. Re: help needed sorting out a tube rectifier circuit
> (Karl-Arne Markstr?m)
> 5. Re: Energy stored in capacitor bank ? (Larry Carman)
> 6. Re: Amps Digest, Vol 34, Issue 15 (K3vw@aol.com)
> 7. 3-500 Amperex tubes (John E.Cleeve)
> 8. Tube Identification (Robert Dorchuck W6VY)
> 9. WTB: AL-80B or AL-572 (Scott Manthe)
> 10. MA1000B METRON (Ronald Smith)
> 11. Re: Tube Identification (Steve Thompson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 4 Oct 2005 16:18:05 GMT
> From: "wc6w@juno.com" <wc6w@juno.com>
> Subject: [Amps] Plate Choke Alternatives
> To: amps@contesting.com
> Message-ID: <20051004.091839.15654.49139@webmail27.lax.untd.com>
> Content-Type: text/plain
>
> QST
> To whomever it may be of interest, I've uploaded a short treatise on the
> subject of wideband plate choke alternatives to my web page.
>
> http://wc6w.50webs.com/wc6wamps/index.html?fr62.html
>
> 73 & Good morning,
> Marv WC6W
>
>
>
>
> *
>
>
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> ------------------------------
>
> Message: 2
> Date: Tue, 4 Oct 2005 15:49:06 -0000
> From: <chris@yipyap.com>
> Subject: [Amps] help needed sorting out a tube rectifier circuit
> To: <amps@contesting.com>
> Message-ID: <200510041549.j94Fn6XL006815@web160.megawebservers.com>
>
>
>
>
> (kind of AMPS related... you may want to delete if you're
> not into old tube gear)
>
> I'm back to working on restoration of a big homebrew
> AM/CW rig that I inherited from W6MSC last December.
>
> I am scratching my head over an auxillary power supply
> circuit. There are 4 tubes (866 types) 4 transformers,
> and it looks like he's taking HV out of two different
> points in the circuit.
>
> Here is a rough drawn schematic (as much as I have
> been able to sort out so far). There are some
> parts in the drawing that are not applicable.
>
> The question I've got concerns the connections D, E, and F
> between the Aux Power deck and the Rectifier deck.
> It looks like he's taking HV out of both the center tap
> on transformer D-F and also from the center tap in
> the rectifier labeled E. My labels of "1500v" and "750v"
> are estimates based on the circuits they are feeding.
>
> I don't understand.
>
> http://www.yipyap.com/radio_stuff/rectifier_query.pdf
> (and yes, I drew my "T1" transformer coils kind of goofy...
> sorry about that. If I get time today I will work
> on a nicer picture to illustrate my quandry.)
>
>
> Any help would be appreciated.
>
> Chris Howard
> w0ep
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 4 Oct 2005 09:44:51 -0700
> From: R.Measures <r@somis.org>
> Subject: Re: [Amps] Is cleanliness next to God-liness?
> To: "Frank N. Haas" <kb4t@arrl.net>
> Cc: amps@contesting.com
> Message-ID: <b82113a23a6665f1ce460d90ab84ece8@somis.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> On Oct 4, 2005, at 8:35 AM, Frank N. Haas wrote:
>
> >
> > Fellow AMPers:
> >
> > I just took delivery of 3 well used 3CX400A7/8874 ceramic power
> > triodes. I
> > bought them as spares for my recently purchased Alpha 78 amp.
> >
> > All 3 tubes are rather tarnished with many dark spots and no shine
> > whatsoever.
> >
> > I want to test these tubes in my Alpha 78 to insure that all 3 work.
> >
> > Should I clean them before I install them??? If so, what is the
> > recommended
> > cleaning technique for these tubes?
>
> Frank
> Immerse them in diluted ammonia overnight - then polish them with Bon
> Ami? cleanser, rinse and dry. However, the 8874s should first be
> high-potted to see if the gold-plating on the grid has sputtered.
>
> >
> > Are common "household" products like TARN-X, NEVR-DULL, BRASSO or the
> > like
> > appropriate??
>
> These are aggressive cleaners.
> >
> > Is it even important that the tubes be clean?
> >
> For the Funderberg gold-sputter test, shiny clean matters not.
> http://www.somis.org/Goldmeltballs.html
>
> > 73,
> >
> > Frank N. Haas KB4T
> > Florida
> >
> >
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org<http://www.somis.org>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 4 Oct 2005 19:11:11 +0200
> From: Karl-Arne Markstr?m <sm0aom@telia.com>
> Subject: Re: [Amps] help needed sorting out a tube rectifier circuit
> To: <amps@contesting.com>, <chris@yipyap.com>
> Message-ID: <000001c5c907$2852db80$bc01a8c0@speedbox>
> Content-Type: text/plain; charset=iso-8859-1
>
> What you have here is the classic "economy power supply", which is a
> combination of the full wave Graetz bridge circuit, and the center-tap
> full-wave rectifier. If you look closely in the power supplies chapter in
> the 1970's
> ARRL handbooks, it is commonly used for SSB transceiver power supplies.
>
> The full-wave bridge generates the 1500V, and the center-tap generates the
> 750V.
>
> This circuit is most common with solid-state rectifiers, but can be
> realized as well with
> both vacuum and mercury-vapor rectifiers.
>
> 73/
>
> Karl-Arne
> SM0AOM
>
>
>
> ----- Original Message -----
> From: <chris@yipyap.com>
> To: <amps@contesting.com>
> Sent: Tuesday, October 04, 2005 5:49 PM
> Subject: [Amps] help needed sorting out a tube rectifier circuit
>
>
> >
> >
> >
> > (kind of AMPS related... you may want to delete if you're
> > not into old tube gear)
> >
> > I'm back to working on restoration of a big homebrew
> > AM/CW rig that I inherited from W6MSC last December.
> >
> > I am scratching my head over an auxillary power supply
> > circuit. There are 4 tubes (866 types) 4 transformers,
> > and it looks like he's taking HV out of two different
> > points in the circuit.
> >
> > Here is a rough drawn schematic (as much as I have
> > been able to sort out so far). There are some
> > parts in the drawing that are not applicable.
> >
> > The question I've got concerns the connections D, E, and F
> > between the Aux Power deck and the Rectifier deck.
> > It looks like he's taking HV out of both the center tap
> > on transformer D-F and also from the center tap in
> > the rectifier labeled E. My labels of "1500v" and "750v"
> > are estimates based on the circuits they are feeding.
> >
> > I don't understand.
> >
> > http://www.yipyap.com/radio_stuff/rectifier_query.pdf
> > (and yes, I drew my "T1" transformer coils kind of goofy...
> > sorry about that. If I get time today I will work
> > on a nicer picture to illustrate my quandry.)
> >
> >
> > Any help would be appreciated.
> >
> > Chris Howard
> > w0ep
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> > --
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> 2005-10-03
> >
> >
>
>
> --
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>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 4 Oct 2005 12:18:40 -0500
> From: "Larry Carman" <lncarman@swbell.net>
> Subject: Re: [Amps] Energy stored in capacitor bank ?
> To: <AMPS@CONTESTING.COM>
> Message-ID: <MGEKJGEAIIFAHGPIKMIHMEOADMAA.lncarman@swbell.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Thanks much Ian,
> I downloaded pusd and expanded rectifiers file. Will give it a whirl.
> Larry N5BIP
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> Behalf Of Ian White G/GM3SEK
> Sent: Tuesday, October 04, 2005 9:05 AM
> To: amps@contesting.com
> Subject: Re: [Amps] Energy stored in capacitor bank ?
>
>
> Larry Carman wrote:
> >I try to keep the HV PS capacitance at about 25uF with a 50% safety
> >margin. All the amps I've built have used 3800VDC to 5000VDC at one to
> >two amps. Oh! in a couple supplies I used a choke input with about 12
> >uF. All seemed to work nicely for me. I've never ran the lower voltage
> >tubes, say around 2000 VDC, but I guess 35 uF would be more adequate
> >for 1.5 plus amperes at 2000 VDC than 25 uF.
> >
> >There has to be a chart somewhere out there on the www that shows
> >ripple percentage based on voltage, current and capacitance. Maybe it's
> >in the ARRL handbook somewhere. What would be better is an on-line
> >calculator to take the brain work out of it. If anyone has or finds
> >this, let me know so I can put it on my website.
> >
>
> The 'PSU Designer' program ends all the guesswork.
>
> Follow the links from my site, and also collect the expanded rectifiers
> file for HV supplies:
> http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#psud
>
>
> --
> 73 from Ian G/GM3SEK 'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.co.uk/g3sek
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 4 Oct 2005 17:14:22 EDT
> From: K3vw@aol.com
> Subject: Re: [Amps] Amps Digest, Vol 34, Issue 15
> To: amps@contesting.com
> Message-ID: <1d6.465ce4a8.30744aae@aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> To Hecter, XE2K, look at the padding capacitors on the output capacitor,
> on
> the right. Replace them with Centralab 850A's. I believe they are equal to
> 600
> pf. I would use two- 300 pf @ 5 KV. Willy K3VW
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 05 Oct 2005 01:02:20 +0100
> From: John E.Cleeve <g3jvc@jcleeve.idps.co.uk>
> Subject: [Amps] 3-500 Amperex tubes
> To: amps@contesting.com
> Message-ID: <20051005000229.BDB2D318F95@dayton.akorn.net>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I would thank everyone who responded to my plea for help. The advice
> given is very much appreciated, and I hope that following repairs to
> the effected tube pins, and the implimentation of directed cooling air
> across the tube pins, will prevent the problem occurring again.
> Sincerely, John. G3JVC.
>
>
> ------------------------------
>
> Message: 8
> Date: Tue, 04 Oct 2005 17:59:46 -0700
> From: "Robert Dorchuck W6VY" <w6vy@verizon.net>
> Subject: [Amps] Tube Identification
> To: <amps@contesting.com>
> Message-ID: <006d01c5c948$17390bd0$2c01a8c0@W6VYDESK>
> Content-Type: text/plain; format=flowed; charset=iso-8859-1;
> reply-type=original
>
> Can anyone help me identify a couple of tubes. They look like 4CX250B's.
>
> They were made by Eimac for IFI and the IFI number is M400. The only
> other markings are what appears to be the date code of 9026 and a
> serial number. I have a pair of these with sockets and Johnson
> 124-0111-001 ceramic chimneys but have no idea what they can be used
> for.
>
> I have a picture available if that would help.
>
> Thanks,
> Bob W6VY
>
> ----------------------------------------------------------------
> All Outgoing Messages Scanned by Norton Anti Virus
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>
>
> ------------------------------
>
> Message: 9
> Date: Tue, 04 Oct 2005 21:09:53 -0500
> From: Scott Manthe <n9aa@arrl.net>
> Subject: [Amps] WTB: AL-80B or AL-572
> To: Amps@contesting.com
> Message-ID: <434335F1.3040504@arrl.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hello all,
> My plans have changed somewhat and I've decided to put off the QRO amp
> till the spring. Does anyone have a nice AL-80B or AL-572 they'd like to
> get rid of? I'm looking for something in the $700-800 range.
>
> Thanks,
> Scott, N9AA
>
>
>
> ------------------------------
>
> Message: 10
> Date: Tue, 4 Oct 2005 19:38:31 -0700
> From: "Ronald Smith" <kb7zr@hotmail.com>
> Subject: [Amps] MA1000B METRON
> To: <amps@contesting.com>
> Message-ID: <BAY22-DAV84A0577BCB52639C2F24BF9820@phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Looking for the 75 amp high speed magnetic circuit breaker and a remote
> control head for the MA1000B Metron amp. Any info would be of help. Thanks
> Ron KB7ZR
>
> ------------------------------
>
> Message: 11
> Date: Wed, 05 Oct 2005 07:28:30 +0100
> From: Steve Thompson <g8gsq@ic24.net>
> Subject: Re: [Amps] Tube Identification
> To: Robert Dorchuck W6VY <w6vy@verizon.net>
> Cc: amps@contesting.com
> Message-ID: <4343728E.4060707@ic24.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Robert Dorchuck W6VY wrote:
>
> >Can anyone help me identify a couple of tubes. They look like 4CX250B's.
> >
> >
> Likelyhood is they are 4CX250s, with custom marking to secure spares
> business at generous prices. Sometimes there's non-standard testing to
> verify particular characteristics for the customer.
>
> Steve
>
>
> ------------------------------
>
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>
>
> End of Amps Digest, Vol 34, Issue 17
> ************************************
>
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