It is all about size and weight. A modern SS amp could dispense with the
power transformer, though, a reduce both those limitations.
On 4/30/12 2:08 PM, Carl wrote:
> There were plenty of old amps run on CW at "2000W PEP" at 1200-1300W out and
> many never broke into a sweat either and were capable of more. It was the
> SB-200 and 220 that brought the wimpy PS and everything else into the
> forefront.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "W2XJ"<w2xj@nyc.rr.com>
> To:<amps@contesting.com>
> Sent: Monday, April 30, 2012 1:04 PM
> Subject: Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any
> Opinions ?
>
>
>> Depending on modes used, amps today need to do more than older amps.
>> Back when the power limit was 1 KW input amps had to produce nearly half
>> the power that modern amps do. 1500 W out with RTTY, Cw or PSK31
>> requires a lot more guts as well as low IMD. Modern tube amps that can
>> really do this also cost around $6K so that seems to be the market price
>> point for a good gutsy amp regardless of the technology.
>>
>> On 4/30/12 5:17 AM, Pete Smith N4ZR wrote:
>>> Bravo, Jim. Interestingly, Elecraft showed a PA-1500 at Dayton for
>>> several years, and I know they had at least one out for field test. It
>>> had a flock of super features, including very fast band-changing, QSK,
>>> etc. Sounds a lot like the KPA-500 X3
>>>
>>> Recently, someone commented authoritatively (well, it sounded like it)
>>> on the Elecraft reflector that Wayne and Eric had decided against
>>> marketing the amp because it would have to be priced at $6000, and they
>>> thought that price point was too high. Recent discussion about SS amps,
>>> however, seems to indicate that this pricing would now be reasonable,
>>> and I, for one, would seriously consider making it my first new amp,
>>> even though $6K is more than I have spent on ham equipment in the last
>>> decade.
>>>
>>> 73, Pete N4ZR
>>> The World Contest Station Database, updated daily at
>>> www.conteststations.com
>>> The Reverse Beacon Network at http://reversebeacon.net, blog at
>>> reversebeacon.blogspot.com,
>>> spots at telnet.reversebeacon.net, port 7000 and
>>> arcluster.reversebeacon.net, port 7000
>>>
>>>
>>> On 4/29/2012 11:02 PM, Jim Brown wrote:
>>>> On 4/29/2012 5:24 PM, Roger (K8RI) wrote:
>>>>>> Most of the tube designs have been significantly "over engineered".
>>>>>>> That is, the tubes have excess plate dissipation for the power
>>>>>>> output
>>>>>>> and grids that will take a significant beating.
>>>>> Which is a plus for tubes.
>>>> Naw, it's a plus for conservative design.
>>>>
>>>> One thing that seems to be missed in this discussion about home brewing
>>>> amps was clearly pointed in a comment in this thread -- the key to solid
>>>> state amp design is THERMAL design and protection. Those are very
>>>> different skills than most amp designers of our generation learned, so
>>>> at least in part, it's an "old dog new tricks" problem, not a limitation
>>>> of the technology.
>>>>
>>>> 73, Jim K9YC
>>>> _______________________________________________
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>>>>
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