A pair of 4-400A's fit and work fine in a SB-220 at about 200W less than
3-500's unless the drive is increased. The grids also have to be directly
grounded.
Carl
KM1H
----- Original Message -----
From: <donroden@hiwaay.net>
To: <amps@contesting.com>
Sent: Sunday, June 10, 2012 6:24 PM
Subject: Re: [Amps] Hunter 2000c (short review)
> 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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