[Amps] Hunter 2000c Bandit

Sun Jun 10 07:06:48 PDT 2012

Yeah, they did a lot of things different back then when hams had to learn 
more than how to plug a checkbook radio and amp into the wall.

Solid state was still in the future for the most part, tube exciters could 
load into untuned GG amps, IMD was poorly understood (which it still is by 
most of whats allowed on the air), and tuning using just a relative power 
meter to peak the output was as good as a grid meter for glass tube amps 
using a pair of 3-400, 3-500 or a quad of 572B's.
 With an 8877 or the 8874 family it could get you into a world of hurts real 
fast. Even several Alphas did not have grid protection circuits.

Carl
KM1H

----- Original Message ----- 
From: "Charles Harpole" <k4vud at hotmail.com>
To: <gudguyham at aol.com>; <k8wbl at yahoo.com>; <amps at contesting.com>; 
<k7fm at teleport.com>
Sent: Sunday, June 10, 2012 8:10 AM
Subject: Re: [Amps] Hunter 2000c Bandit

>
> Dont forget  its high voltage current on the PTT relay, danger for todays 
> rigs.
>
>
>
>
>
> Charles Harpole
> k4vud at hotmail.com
>
>
> ----------------------------------------
>> From: Gudguyham at aol.com
>> Date: Sun, 10 Jun 2012 07:32:45 -0400
>> To: k8wbl at yahoo.com; amps at contesting.com; k7fm at teleport.com
>> Subject: Re: [Amps] Hunter 2000c (short review)
>>
>>
>> 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 at yahoo.com writes:
>>
>> Thanks Colin..
>>
>> 73, Tim K8WBL
>>
>>
>>
>> --- On Sat, 6/9/12, k7fm <k7fm at teleport.com> wrote:
>>
>> From: k7fm <k7fm at teleport.com>
>> Subject: Re: [Amps] Hunter 2000c
>> To: amps at 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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