if I were you I would get some motor winding paint varnish from grainger or
your sherwin williams store its good for 2.5kv per mil of film must be baked
on to raise the kv rating
N9IWW
riginal Message-----
From: amps-request@contesting.com
Sent: Saturday, November 30, 2013 1:44 PM
To: amps@contesting.com
Subject: Amps Digest, Vol 131, Issue 64
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Today's Topics:
1. Re: Chinese FU-724F (Carl)
2. Re: Adhesive for plate choke? (Carl)
3. Re: Adhesive for plate choke? (peter chadwick)
4. Re: Bleeder resistor across screen grid terminal (Bill Turner)
5. Re: Adhesive for plate choke? (Bill Turner)
6. Re: Adhesive for plate choke? (Mike)
7. Re: Adhesive for plate choke? (Mike)
8. Re: Adhesive for plate choke? (iain macdonnell - N6ML)
9. Re: GS-35b Amplifier (jeff millar)
----------------------------------------------------------------------
Message: 1
Date: Fri, 29 Nov 2013 11:02:24 -0500
From: "Carl" <km1h@jeremy.mv.com>
To: <gdaught6@stanford.edu>, <amps@contesting.com>
Subject: Re: [Amps] Chinese FU-724F
Message-ID: <AE5D0FED27424C5AA6DDEB6B6CF2EC33@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: <gdaught6@stanford.edu>
To: <amps@contesting.com>
Sent: Wednesday, November 27, 2013 11:53 AM
Subject: Re: [Amps] Chinese FU-724F
Hsu wrote...
I found a Chinese cheap triode for industry, filamnet 6V/50A;
Pamax=2.5kW; Grid diss=150W;Umax=6kV;
u=70, you know most industrial triodes are low/ meidum u tubes, but
this one is high u tube.
As it is idustial tube , so the price is cheap.Any suggestion?does
it fit hamradio well?
Look at the mu (amplification factor) for the 3-500Z, or the 8877, for
example: 160
and 200. With a mu of 70, it will take considerably more drive power than
what is
usual for amateur service.
73,
George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 4-5, 2014
No argument there but many rigs have excess power to burn and many others
use an IPA to drive a YC-156 and other tubes with handles anyway. That is
what the ALS-600, SB-1000, AL-80 family, etc are used for.
Also several of the old glass tetrodes popularly used in GG wind up with an
effective mu not much above the FU-724F, especially when run at a voltage
well below their maximum. Think 4-1000A or a 4-400 used in a SB-220.
Carl
KM1H
------------------------------
Message: 2
Date: Fri, 29 Nov 2013 11:04:53 -0500
From: "Carl" <km1h@jeremy.mv.com>
To: "iain macdonnell - N6ML" <ar@dseven.org>, "AMPS"
<amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID: <6F385FED42784A42ADC3AC8AD87CFC2B@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Why? A replacement is only $20 and an improvement over early AL-1200's. It
took Ameritron 3 tries to get it right.
Carl
KM1H
----- Original Message -----
From: "iain macdonnell - N6ML" <ar@dseven.org>
To: "AMPS" <amps@contesting.com>
Sent: Wednesday, November 27, 2013 3:17 PM
Subject: [Amps] Adhesive for plate choke?
I'm going to attempt to rewind a plate choke for my AL-1200, using the
old form from the one I blew before. What is the recommend adhesive
for this application? I've read about home-brew "Q-Dope"[1] - would
that work? Other suggestions? I'd prefer something that's not going to
be flammable when in use...
73,
~iain / N6ML
[1] http://www.cliftonlaboratories.com/coil_coating_compounds.htm
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Message: 3
Date: Fri, 29 Nov 2013 17:32:53 +0100
From: peter chadwick <g8on@fsmail.net>
To: iain macdonnell - N6ML <ar@dseven.org>, AMPS <amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID: <1800184.16471385742772938.JavaMail.www@wwinf3715>
Content-Type: text/plain; charset=UTF-8
If the choke is going to get hot, I'd be wary of Q dope, as it may well
start melting. I've had decent results with minimal loss of Q with some of
the 5 minute epoxy cements.
73
Peter G3RZP
========================================
Message Received: Nov 29 2013, 03:39 PM
From: "iain macdonnell - N6ML" <ar@dseven.org>
To: "AMPS" <amps@contesting.com>
Cc:
Subject: [Amps] Adhesive for plate choke?
I'm going to attempt to rewind a plate choke for my AL-1200, using the
old form from the one I blew before. What is the recommend adhesive
for this application? I've read about home-brew "Q-Dope"[1] - would
that work? Other suggestions? I'd prefer something that's not going to
be flammable when in use...
73,
~iain / N6ML
[1] http://www.cliftonlaboratories.com/coil_coating_compounds.htm
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------------------------------
Message: 4
Date: Fri, 29 Nov 2013 14:49:57 -0800
From: Bill Turner <dezrat1242@yahoo.com>
To: Amps <amps@contesting.com>
Subject: Re: [Amps] Bleeder resistor across screen grid terminal
Message-ID: <l76i9917rp7grb6jftp1pceki0uniqut4d@4ax.com>
Content-Type: text/plain; charset=us-ascii
ORIGINAL MESSAGE: (may be snipped)
On Thu, 28 Nov 2013 18:08:19 -0700, K5PRO wrote:
My point being, a stiff shunt R across screen grid is a good idea, not
only from the standpoint of keeping the screen always terminated during
switching, but also for circuit stability. I have done it both with and
without the R, but these days I prefer having the shunt R there, and
burn up some screen power from the supply.
REPLY:
It should be noted that the shunt R is only needed if you have a series type
screen regulator, which is probably the most common type. If you have a
shunt type screen regulator, the R is not needed PROVIDED the shunt
regulator draws enough idle current to supply all the secondary emission
current the screen will ever draw.
73, Bill W6WRT
------------------------------
Message: 5
Date: Fri, 29 Nov 2013 14:53:09 -0800
From: Bill Turner <dezrat1242@yahoo.com>
To: Amps <amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID: <ph6i99trisbejcge2l6ue8bopdkspit599@4ax.com>
Content-Type: text/plain; charset=us-ascii
ORIGINAL MESSAGE: (may be snipped)
On Wed, 27 Nov 2013 12:17:01 -0800, you wrote:
I'm going to attempt to rewind a plate choke for my AL-1200, using the
old form from the one I blew before. What is the recommend adhesive
for this application? I've read about home-brew "Q-Dope"[1] - would
that work? Other suggestions? I'd prefer something that's not going to
be flammable when in use...
73,
~iain / N6ML
REPLY:
Whatever you do be sure to test it for resonances very carefully. Not only
will the Q-dope affect resonance, so will the exact wire you use. Different
wires have different thickness and types of enamel and therefore different
inter-winding capacitance.
Personally, I'd just buy a replacement from Ameritron and be done with it.
73, Bill W6WRT
------------------------------
Message: 6
Date: Fri, 29 Nov 2013 16:09:54 -0800
From: "Mike" <noddy1211@comcast.net>
To: "'iain macdonnell - N6ML'" <ar@dseven.org>, "'AMPS'"
<amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID: <007e01ceed60$7fc45660$7f4d0320$@net>
Content-Type: text/plain; charset="us-ascii"
Iain,
You can purchase that Choke from RF Parts for about 20 bucks, I was going to
re-wind the one that blew in my old Clipperton Amp, it was more cost
effective to spend the 20 bucks. The RF-Parts choke is the same as the one
Ameritron uses.
Mike/K6BR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of iain macdonnell
- N6ML
Sent: Wednesday, November 27, 2013 12:17 PM
To: AMPS
Subject: [Amps] Adhesive for plate choke?
I'm going to attempt to rewind a plate choke for my AL-1200, using the old
form from the one I blew before. What is the recommend adhesive for this
application? I've read about home-brew "Q-Dope"[1] - would that work? Other
suggestions? I'd prefer something that's not going to be flammable when in
use...
73,
~iain / N6ML
[1] http://www.cliftonlaboratories.com/coil_coating_compounds.htm
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Message: 7
Date: Fri, 29 Nov 2013 16:15:40 -0800
From: "Mike" <noddy1211@comcast.net>
To: "'iain macdonnell - N6ML'" <ar@dseven.org>, "'AMPS'"
<amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID: <008201ceed61$4d8ed520$e8ac7f60$@net>
Content-Type: text/plain; charset="us-ascii"
http://www.rfparts.com/catalogsearch/result/?q=ameritron+plate+choke
forgot the link.
Mike/K6BR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of iain macdonnell
- N6ML
Sent: Wednesday, November 27, 2013 12:17 PM
To: AMPS
Subject: [Amps] Adhesive for plate choke?
I'm going to attempt to rewind a plate choke for my AL-1200, using the old
form from the one I blew before. What is the recommend adhesive for this
application? I've read about home-brew "Q-Dope"[1] - would that work? Other
suggestions? I'd prefer something that's not going to be flammable when in
use...
73,
~iain / N6ML
[1] http://www.cliftonlaboratories.com/coil_coating_compounds.htm
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Message: 8
Date: Fri, 29 Nov 2013 19:26:39 -0800
From: iain macdonnell - N6ML <ar@dseven.org>
To: Mike <noddy1211@comcast.net>
Cc: AMPS <amps@contesting.com>
Subject: Re: [Amps] Adhesive for plate choke?
Message-ID:
<CACDL7B0pzi4B4wWq-YiPOQAz_8p3cYRS51C1GVA02=SAFu+6hA@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Yes, I know I can buy a replacement. I already did. The original in my
AL-1200 was the single-section type, and I blew it on 17m. I want to
use the form from that original to wind a clone of the newer
three-section design. I'm sure it doesn't make economical sense, if I
put some value on my time, but maybe I'll learn something in the
process. Actually, I already did - research led me to W8JI's web page
that describes how the sectioning shifts the series resonances away
from the WARC bands...
73,
~iain / N6ML
On Fri, Nov 29, 2013 at 4:15 PM, Mike <noddy1211@comcast.net> wrote:
http://www.rfparts.com/catalogsearch/result/?q=ameritron+plate+choke
forgot the link.
Mike/K6BR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of iain
macdonnell
- N6ML
Sent: Wednesday, November 27, 2013 12:17 PM
To: AMPS
Subject: [Amps] Adhesive for plate choke?
I'm going to attempt to rewind a plate choke for my AL-1200, using the old
form from the one I blew before. What is the recommend adhesive for this
application? I've read about home-brew "Q-Dope"[1] - would that work?
Other
suggestions? I'd prefer something that's not going to be flammable when in
use...
73,
~iain / N6ML
[1] http://www.cliftonlaboratories.com/coil_coating_compounds.htm
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Message: 9
Date: Sat, 30 Nov 2013 10:15:17 -0500
From: jeff millar <wa1hco@wa1hco.net>
To: amps@contesting.com
Subject: Re: [Amps] GS-35b Amplifier
Message-ID: <529A0105.8010202@wa1hco.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Nuno...
See Below
On 11/29/2013 05:08 AM, Nuno Lopes wrote:
Hi all,
This will be my first big project like this, I'm in the beginning of start
my first project with an amplifier, and have some questions.
I'll start from the Anode tank first then working around that, I'm
thinking
to make an tank like this one (
http://home.earthlink.net/~wd7s/images/photo2a.jpg ) with the
dimensions 7.874" Wide by 11.81" Deep, the tube will be 1.97" from each
side and back of the tank, will there be any problem with that?
The output network has currents that flow in three loops,
1) Plate, Tune cap, Grid
2) Tune Cap, Coil, Load Cap
3) Load Cap, Output Coax
The ground return path for each of these loops is critical to performance
The design you have shown in the wd7s site has a grid return current path
with
several aluminum chassis joints. Front panel, to bottom chassis, to grid
box.
The best design for return current flow puts the tube grid, tune cap, load
cap,
and output connector
on the same sheet of aluminum and build from there.
The wd7s design works if each aluminum joint is made to carry high RF
current with
minimum voltage drop.
jeff, wa1hco
------------------------------
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