[Amps] Amps Digest, Vol 86, Issue 52
K3vw at aol.com
K3vw at aol.com
Sun Feb 14 10:41:28 PST 2010
Greg, W7MY, the 3CX800's are triodes and the GU-74B's are Tetrodes. Willy
K3VW
In a message dated 2/14/2010 10:59:28 A.M. Eastern Standard Time,
amps-request at contesting.com writes:
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Today's Topics:
1. Manual for a Systems Electronics AM 200 Impedance Bridge
(Alton McConnell)
2. Tentec Titan 425 with GU74-B???? (Greg Chartrand)
3. Epilogue: Ameritron QSK-5 Insertion Loss (Paul Christensen)
4. Re: Tentec Titan 425 with GU74-B???? (Roger)
5. Re: WTB: Amp supply LK-500 Filament Transformer (R. David Eagle)
6. HP 851B Spectrum Analyzer and HP 400DR VTVM for sale (Kansas
City area) (Robert Groh)
7. 100k .2% tol eq resistor. (Jim Thomson)
8. Re: HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area) (Fuqua, Bill L)
9. Fw: Tentec Titan 425 with GU74-B???? (budi santoso)
10. Re: HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area) (Robert Groh)
----------------------------------------------------------------------
Message: 1
Date: Sat, 13 Feb 2010 20:22:46 +0000
From: Alton McConnell <amcconnell3 at hotmail.com>
Subject: [Amps] Manual for a Systems Electronics AM 200 Impedance
Bridge
To: <amps at contesting.com>
Message-ID: <SNT137-w1189FBD57AFDE3C59929AAFA4C0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hello eferyone:
Does anyone have a digitized manual for a Systems Electronics (Cleveland,
OH) AM 200 Impedance Brdige?
Thanks,
Alton, NU8L
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
http://clk.atdmt.com/GBL/go/201469228/direct/01/
------------------------------
Message: 2
Date: Sat, 13 Feb 2010 13:37:41 -0800 (PST)
From: Greg Chartrand <w7my at yahoo.com>
Subject: [Amps] Tentec Titan 425 with GU74-B????
To: amps at contesting.com
Message-ID: <432554.20963.qm at web54006.mail.re2.yahoo.com>
Content-Type: text/plain; charset=us-ascii
I'm looking at buying a pair of GU74-B's to have on hand as spares for my
Titan 425. Has anyone out there replaced the 3cx800A7's with GU74-B's??
Greg
---------------------------------------------------------
Greg Chartrand - W7MY
Richland, WA.
DN-06IF
W7MY Home Page:
http://webpages.charter.net/w7my/
------------------------------
Message: 3
Date: Sat, 13 Feb 2010 17:31:30 -0500
From: "Paul Christensen" <w9ac at arrl.net>
Subject: [Amps] Epilogue: Ameritron QSK-5 Insertion Loss
To: <amps at contesting.com>
Message-ID: <B0574190C52D497DAAEDDA92D0BD9BED at DBTOA000>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
This afternoon, I conducted more comprehensive insertion loss testing
through the Ameritron QSK-5. I confirmed that the result of the excessive
loss is primarily due to the SPE's ATU being in-line, even in bypass. In
bypass, the ATU must still be optimized per band and per band segment.
More
than likely, I had not optimized the SPE tuner before testing and had
neglected to include all tuner loss, thinking that the SPE was in hard
bypass in "standby" mode through what I imagined was a high-quality relay
bypass with short leads, resulting in a fairly constant Z through the
bypass
and essentially minimial loss. The SPE ATU is indeed active whether the
amp
is in bypass or operate.
I again ran 100W through the SPE after optimizing the ATU in bypass, and
measured only the diffefrence of the QSK-5 being in and out of the circuit
and reconfirmed by testing with the SPE amp in hard bypass by jumpering
the
amp's In and Out cables together. Recall that my QSK-5 is never in bypass
mode through its internal relays; its always in the operate mode through
the
PIN diodes and amp bias is controled seperately.
Measured QSK-5 loss:
40m: 0.22 dB
10m 0.23 dB
Measured loss through SPE tuner using "auto-tune" optimizing:
40m 0.30 dB
10m 1.00 dB
The disparity between my original 1.5 dB loss on 10m and the new combined
measurement of 1.23 dB is likely the result of the ATU not being optimized
and saved to memory during the initial testing. The SPE amp uses a
switched
relay network consisting of caps and toroids much like that used in many
of
today's internal rig tuners. My experience is that switched component
tuners in general are more lossy than classic internal tuners using
variable
C and switched or variable L.
Again, today's testing was conducted using a Bird 150W Terma-Line load.
I'm
much happier with the QSK-5 loss performance now.
Paul, W9AC
------------------------------
Message: 4
Date: Sat, 13 Feb 2010 18:02:41 -0500
From: Roger <sub1 at rogerhalstead.com>
Subject: Re: [Amps] Tentec Titan 425 with GU74-B????
To: Greg Chartrand <w7my at yahoo.com>
Cc: amps at contesting.com
Message-ID: <4B772F91.3070009 at rogerhalstead.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Greg Chartrand wrote:
> I'm looking at buying a pair of GU74-B's to have on hand as spares for
my Titan 425. Has anyone out there replaced the 3cx800A7's with GU74-B's??
> Greg
>
The GU-74B's are supposedly the same as the 4CX-800, not the 3CX-800A7
73
Roger (K8RI)
73
Roger (K8RI
> ---------------------------------------------------------
>
> Greg Chartrand - W7MY
>
> Richland, WA.
>
> DN-06IF
>
>
>
> W7MY Home Page:
>
> http://webpages.charter.net/w7my/
>
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
------------------------------
Message: 5
Date: Sat, 13 Feb 2010 15:10:37 -0800 (PST)
From: "R. David Eagle" <kb8nnu at yahoo.com>
Subject: Re: [Amps] WTB: Amp supply LK-500 Filament Transformer
To: James Colville <jimw7ry at gmail.com>
Cc: amps at contesting.com
Message-ID: <121749.99238.qm at web51703.mail.re2.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Thanks for the tip, Jim!? That did it and now we're working once again.?
It took a little brain surgery to get into it but it was obviously a cold
solder joint from the center tap and the lead coming out of the secondary!? I
just hope Murphy stays away during the next contest!
Thanks again,
Dave
KB8NNU
________________________________
From: James Colville <jimw7ry at gmail.com>
To: R. David Eagle <kb8nnu at yahoo.com>
Cc: amps at contesting.com
Sent: Sat, February 13, 2010 2:48:36 PM
Subject: Re: [Amps] WTB: Amp supply LK-500 Filament Transformer
"dig" the center tap out of the transformer and re-solder it. You may have
to peel some paper back to do it.
Give it a try!
73
Jim W7RY
?
On Sat, Feb 13, 2010 at 11:32 AM, R. David Eagle <kb8nnu at yahoo.com> wrote:
Hello all...A couple weeks ago I posted a message to the group about
losing my grid/plate current and finally found that it was a loose wire on the
center tap of the secondary on the filament transformer....and let me tell
you that it is an annoying problem to find!!!
>
>So now I am in search of a replacement.? If anyone has a filament
transformer?(pref. Dahl)?for an Amp Supply LK-500NT, please drop me an email.
>
>Thanks,
>
>Dave
>kb8nnu
>
>
>
>_______________________________________________
>Amps mailing list
>Amps at contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 6
Date: Sat, 13 Feb 2010 15:28:06 -0800 (PST)
From: Robert Groh <rgroh at swbell.net>
Subject: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area)
To: amps at contesting.com
Message-ID: <256982.70090.qm at web83813.mail.sp1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
I just put an vintage HP 851 Spectrum Analyzer on our local (i.e. Kansas
City) Craigslist and thought I might just mention it here in case someone is
interested.
<http://kansascity.craigslist.org/ele/1599589710.html>
It is a big and bulky item and I really, really don't want to ship it. The
price is low (or at least I think it is - open to offers if it doesn't
leap (?) off the shelf. It is not really appropriate to look at IMD as it just
doesn't have the resolution (i.e. bandwidth and scan are toooo wide) but
then again I'm not asking a lot. It hasn't been used in many, many years and
I have no idea how easy it will to be get going.
I also have a vintage HP AC VTVM (HP 400D in rack mount) for sale
<http://kansascity.craigslist.org/ele/1599585100.html>
Nice little beast but, of course, old. Basically 1 mV FS to 300 V FS, 10
Hz to 4 MHz. This one would be fairly easy to ship.
So there you go. Trying desperately to pare down the 'stuff' in the ham
shack!
73
Bob Groh, WA2CKY
------------------------------
Message: 7
Date: Sat, 13 Feb 2010 18:02:13 -0800
From: "Jim Thomson" <Jim.thom at telus.net>
Subject: [Amps] 100k .2% tol eq resistor.
To: <amps at contesting.com>
Message-ID: <BC7F9269BD0141BFA201AFC485037479 at JimboPC>
Content-Type: text/plain; charset="iso-8859-1"
Some have had difficulty finding this part in the mouser catalog. I
plugged in the below... "Vishay CPF3100K00FHB14" into mousers own
search box........ and it comes out right away. they have 150 in stock. If
anybody actually orders em.. perhaps ask mouser nicely, to order a bunch
more of em... like several hundred. When I got mine last yr.. they came in
100 per box.
Vishay CPF3100K00FHB14
later.... Jim VE7RF
------------------------------
Message: 8
Date: Sun, 14 Feb 2010 01:15:50 -0500
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
Subject: Re: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for
sale (Kansas City area)
To: Robert Groh <rgroh at swbell.net>, "amps at contesting.com"
<amps at contesting.com>
Message-ID:
<60374AAC83C8764A98809A65BED321CB0183F24CB4 at EX7FM04.ad.uky.edu>
Content-Type: text/plain; charset="us-ascii"
I realize a lot of people are getting away from EBAY for various reasons.
Where are they auctioning their stuff off now days. I am finding less and
less on ebay.
73
bill wa4lav
________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf
Of Robert Groh [rgroh at swbell.net]
Sent: Saturday, February 13, 2010 6:28 PM
To: amps at contesting.com
Subject: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area)
I just put an vintage HP 851 Spectrum Analyzer on our local (i.e. Kansas
City) Craigslist and thought I might just mention it here in case someone is
interested.
<http://kansascity.craigslist.org/ele/1599589710.html>
It is a big and bulky item and I really, really don't want to ship it. The
price is low (or at least I think it is - open to offers if it doesn't
leap (?) off the shelf. It is not really appropriate to look at IMD as it just
doesn't have the resolution (i.e. bandwidth and scan are toooo wide) but
then again I'm not asking a lot. It hasn't been used in many, many years and
I have no idea how easy it will to be get going.
I also have a vintage HP AC VTVM (HP 400D in rack mount) for sale
<http://kansascity.craigslist.org/ele/1599585100.html>
Nice little beast but, of course, old. Basically 1 mV FS to 300 V FS, 10
Hz to 4 MHz. This one would be fairly easy to ship.
So there you go. Trying desperately to pare down the 'stuff' in the ham
shack!
73
Bob Groh, WA2CKY
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 9
Date: Sun, 14 Feb 2010 15:57:45 +0800 (SGT)
From: budi santoso <yb1bs at yahoo.co.id>
Subject: [Amps] Fw: Tentec Titan 425 with GU74-B????
To: amps at contesting.com
Message-ID: <681937.39301.qm at web76604.mail.sg1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
why GU74-B It is tetrode, you will need screen grid supply etc.
You can use 3CPX800, I got a pair medical eq. pull for 350 US$ from eBay,
just plug in and still give more 1500 W output. It need more driving power
but it is ok (grid current 30 mA.plate current 1000 mA for 1500 W output).
73
budi / yb1bs
________________________________
From: Greg Chartrand <w7my at yahoo.com>
To: amps at contesting.com
Sent: Sun, February 14, 2010 4:37:41 AM
Subject: [Amps] Tentec Titan 425 with GU74-B????
I'm looking at buying a pair of GU74-B's to have on hand as spares for my
Titan 425. Has anyone out there replaced the 3cx800A7's with GU74-B's??
Greg
---------------------------------------------------------
Greg Chartrand - W7MY
Richland, WA.
DN-06IF
W7MY Home Page:
http://webpages.charter.net/w7my/
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 10
Date: Sun, 14 Feb 2010 07:59:06 -0800 (PST)
From: Robert Groh <rgroh at swbell.net>
Subject: Re: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for
sale (Kansas City area)
To: "Fuqua, Bill L" <wlfuqu00 at uky.edu>, "amps at contesting.com"
<amps at contesting.com>
Message-ID: <596610.38461.qm at web83808.mail.sp1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Auction sites other than EBAY? Not sure of any. I do use EBAY a fair
amount but I hate having to ship BIG stuff so local Craigslist has been a good
option. Not a very wide audience but reasonable to expect a local pickup!
Of course, you can get your sneaky types also but it works and the cost is
low.
For the HP851 the shipping would be a big problem - not that it isn't
doable but that is one big piece of stuff and it would take a pretty fair
amount of effort to package it right for shipment. And even then, with the
oscilloscope tube in there --- scary stuff. I've done it before and I don't like
doing it. Too much hassle. Now if I could find a local packaging/shipping
company that uses the 'foam-in-place' technique -- I would be there for
that.
73
Bob WA2CKY
________________________________
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: Robert Groh <rgroh at swbell.net>; "amps at contesting.com"
<amps at contesting.com>
Sent: Sun, February 14, 2010 12:15:50 AM
Subject: RE: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area)
I realize a lot of people are getting away from EBAY for various reasons.
Where are they auctioning their stuff off now days. I am finding less and
less on ebay.
73
bill wa4lav
________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf
Of Robert Groh [rgroh at swbell.net]
Sent: Saturday, February 13, 2010 6:28 PM
To: amps at contesting.com
Subject: [Amps] HP 851B Spectrum Analyzer and HP 400DR VTVM for sale
(Kansas City area)
I just put an vintage HP 851 Spectrum Analyzer on our local (i.e. Kansas
City) Craigslist and thought I might just mention it here in case someone is
interested.
<http://kansascity.craigslist.org/ele/1599589710.html>
It is a big and bulky item and I really, really don't want to ship it. The
price is low (or at least I think it is - open to offers if it doesn't
leap (?) off the shelf. It is not really appropriate to look at IMD as it just
doesn't have the resolution (i.e. bandwidth and scan are toooo wide) but
then again I'm not asking a lot. It hasn't been used in many, many years and
I have no idea how easy it will to be get going.
I also have a vintage HP AC VTVM (HP 400D in rack mount) for sale
<http://kansascity.craigslist.org/ele/1599585100.html>
Nice little beast but, of course, old. Basically 1 mV FS to 300 V FS, 10
Hz to 4 MHz. This one would be fairly easy to ship.
So there you go. Trying desperately to pare down the 'stuff' in the ham
shack!
73
Bob Groh, WA2CKY
_______________________________________________
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 86, Issue 52
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