4-400s will fit in a SB-220 but they are too tall.
So does this mean the 3-400 is shorter than the 3-500 , and the 3-500
is shorter than a 4-400 ?
Don W4DNR
Quoting Carl <km1h@jeremy.mv.com>:
> 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
>
>
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