Date: Thu, 1 Jun 2017 18:48:55 +0000
From: Bill Turner <dezrat@xxxxxxxxxxx>
To: Amps group <amps@xxxxxxxxxxxxxx>
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
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