[Amps] RF-KIT SS AMP

[Herbert Schoenbohm]

As the old times in the Midwest used to say...."Never buy a pig in a poke"☺


Herb, KV4FZ


On 6/2/2017 1:01 PM, Jim Thomson wrote:
> Date: Thu, 1 Jun 2017 18:48:55 +0000
> From: Bill Turner <dezrat at outlook.com>
> To: Amps group <amps at contesting.com>
> Subject: Re: [Amps] RF-KIT SS AMP
>
> <It looks pretty good on paper but the real world sometimes has
> <unpleasant surprises in store. I wouldn't buy one until it gets
> <reviewed by an independent third party such as QST. It's real easy to
> <lay out $3k and before long wish you hadn't.
>
> <A word to the wise.
>
> <73, Bill W6WRT
>
>
> ##  agreed,  qst..or at least a handful of experienced  tech savvy types,  who can
> make meaningful  measurements..including imd, etc,  and offer a critque.
>
> ##  I also noticed they reduce power output by reducing the current limit on the power
> supply.... vs  reducing drive.  This method, I have not heard of before.   One would think it
> would flat top 1st..once it hit the current limit threshold ?   But I have zero experience with it.
>
> ##  I have zero experience  with SS amps.  My concern is the TX  IMD products.  Reducing
> drive and PO is one method that would work..but eff  goes to hell..fast.  Diss then increases  with just
> the typ 35% when po reduced.... while maintaining 48-50 vdc.
>
> ##  another method  to reduce IMD  may be to just increase the idle current  a bunch.
> I have no experience with that either..except on tube amps.   But I suspect the eff might creep  up
> a little, and perhaps slightly reduced  IMD.  Then again, the increased idle current would result in
> a higher average dissipation.
>
> ##  A combo of reduced drive, and higher idle current might be the ticket,  but Im just speculating.
> The faster 120mm fans could be used to handle the increased  idle current.  Its not like the SS amp
> has to reside on the desk, it could sit anywhere...like in  my shop next door. Noise problem solved.
>
> Jim   VE7RF
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps