Clone a Thunderbolt or Heath Chippewa
Either will get you there with room to spare
Paul K0UYA
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: "k7fm" <k7fm@teleport.com>; "Eric Mynes" <kc8wzb@gmail.com>;
<amps@contesting.com>
Sent: Tuesday, October 05, 2010 9:20 AM
Subject: Re: [Amps] Questions from a beginner
>I see several possibilities.
>
> A NCL-2000 running on the low power tap will drive to a respectable power
> level depending on actual drive. At the IC-703's 10W rating figure on
> 600-800W out. Running it at less than ratings is one easy way of keeping
> the
> tubes happy.
>
> Johnson Thunderbolt, far from expensive but rather bulky and heavy.
>
> P&H LA-400 will get you to the next stage to drive a bigger GG amp
>
> A modified CB amp. Most use a single GG stage to take 4-5W to drive 2-4
> more
> of the same. Easy to make over to 80-10M with acceptable linearity.
> Finding
> affordable tubes may require using the higher filament voltage versions
> and
> a new filament transformer or a DC bench type PS.
>
> SS....yuk (-;
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "k7fm" <k7fm@teleport.com>
> To: "Eric Mynes" <kc8wzb@gmail.com>; <amps@contesting.com>
> Sent: Monday, October 04, 2010 11:24 PM
> Subject: Re: [Amps] Questions from a beginner
>
>
>> This is in response to Eric, wanting to add an amplifier to his Icom
>> 703+.
>>
>> Eric, there is a major problem. The Icom 703+ is a qrp rig, with an
>> output
>> of 5 or 10 watts. The last I heard, amplifiers sold since about 1980 do
>> not
>> operate at the 5 - 10 watt level. That is because the chicken banders
>> were
>> using those amplifiers to illegally amplify 11 meter signals.
>>
>> Most of the amps sold since then require 50 to 100 watts of drive.
>>
>> So, your options are limited. Some military/commercial amps will drive
>> with
>> your 5 - 10 watts, but they are rarer than the ham amps and will require
>> understand them. Ten-Tec sold a small amp that operated on their
>> argonaut,
>> to boost the signal to 50 watts. But, they are quite rare.
>>
>> The Central Electronics 600L would work ok - but they are not common.
>>
>> Although this forum is about amplifiers, much of the discussion is bent
>> toward the other end of the power spectrum. For this group, 100 - 200
>> watts
>> is qrp.
>>
>> At the power level , you may be better off building a 5 - 100 watt solid
>> state amplifier - but you will have to learn about solid state circuits
>> and
>> building.
>>
>> 73, Colin K7FM
>>
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>
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