Dropping the socket and using Amereitron heat radiators allows the 4-400 and
3-500 family in most 3-400 amps. There may be some where that wont work but
I havent run across them yet or havent had to try.
The screen over the tubes is called a shield and was important in the days
of TVI; it may/maynot be required these days.
Carl
KM1H
----- Original Message -----
From: "Tim Kass" <k8wbl@yahoo.com>
To: <amps@contesting.com>; <k7fm@teleport.com>; <Gudguyham@aol.com>
Sent: Sunday, June 10, 2012 1:10 PM
Subject: Re: [Amps] Hunter 2000c (short review)
The Hunter 2000C will accept 3-500z tubes, however, the screen over the
tubes will have to be removed or modified..I run mine without the screen
on...easy to get to the tubes, unlike the Heath SB=220 .. just lift the
lid..but be careful..no safety latches, etc.
Tim
--- On Sun, 6/10/12, Gudguyham@aol.com <Gudguyham@aol.com> wrote:
From: Gudguyham@aol.com <Gudguyham@aol.com>
Subject: Re: [Amps] Hunter 2000c (short review)
To: k8wbl@yahoo.com, amps@contesting.com, k7fm@teleport.com
Date: Sunday, June 10, 2012, 7:32 AM
Hunter Bandit 200C short review.
1. Covers 80-10 meters
2. Uses (2) 3-400Z tubes
3. Directly grounded grids (not floating)
4. No operating bias added (3-400's operate zero bias to about 4KV)
5. Straight forward Pi-Network
6. No tuned input
7. Full Wave doubler PS design
8. Only 6 filter caps (rated 475vdc) Total HV 2700v
9. Has no provision to read grid current (ala Dentron)
10. Does have a watt meter reading
11. No ALC provision
Although some features are missing on the amp Like an ALC and no tuned
input, the transmitters of those days would have worked just fine with this
amp. A solid state radio of today might have a problem with the no tuned
input. The no ALC is not a big deal unless over 100 watts was available to
drive this amp.
A grid current meter would have been nice but don't know the reasoning for
not adding one here. Funny thing, the multimeter has an "off" position
which is unusual. Don't ya think?
This is based only on seeing the schematic of this amp, I have not really
looked inside of one of these so I cannot comment on the parts used or the
workmanship, although I suppose you could have bought this in kit form or
maybe
already put together at the factory. These amps are pretty rare, you do
not see them too often for sale. As far as circuitry goes, I do not see
much of a Collins influence there. Floating grids would have been there
for sure if the Collins circuit influence was there. The color scheme does
look similar however. I'm not sure, but some of these amps that used 3-400
tubes were built with very little extra room in the tube compartment. When
the 3-400 went out of production and the 3-500 took over, some of these amps
that used 3-400 tubes, would not accept a 3-500 tube inside the tube
compartment. The Swan Mark I and the Henry (forgot the model) will not
accept a 3-500 tube. Even the later addition 3-400's with the tube pin
support may not fit!!!! Bummer....
In a message dated 6/9/2012 9:42:45 P.M. Eastern Daylight Time,
k8wbl@yahoo.com writes:
Thanks
Colin..
73, Tim K8WBL
--- On Sat, 6/9/12, k7fm
<k7fm@teleport.com> wrote:
From: k7fm
<k7fm@teleport.com>
Subject: Re: [Amps] Hunter 2000c
To:
amps@contesting.com
Date: Saturday, June 9, 2012, 8:12 PM
Ted Hunter
helped develop the Collins PTO prior to WWII. He also wrote at
least
one article on the pto design in QST. In addition to the amplifiers
his company sold, they also produced the Cyclemaster 20A, which was a
transmitter using the pto, which was sold in 1948 and 1949. It had a
unique
zero button, which is a red "marble" in the center of the pto
tuning dial.
Push it to zero beat. I am fortunate to own
one.
73, Colin K7FM
_______________________________________________
Amps mailing
list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps
mailing
list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1424 / Virus Database: 2433/5060 - Release Date: 06/10/12
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|