[Amps] New HF amplifier

[Hsu]

This amplifier have been sold more than 20 units in Chinese market., NEVER   have this problem.

----- Original Message ----- 
From: "Dennis OConnor" <ad4hk2004 at yahoo.com>
To: "Hsu" <hsu4qro at gmail.com>
Sent: Tuesday, August 03, 2010 4:24 AM
Subject: Re: [Amps] New HF amplifier


Take it easy Hsu before you have a stroke...
Yes, your friend may be a great guy - but band taps on a toroid will not hold up in a high power amplifier... The induced flux in the unused turns will saturate the core and overheat and burn it up...  It has been tried by more than one amp builder to save money and it has failed every time... Commander used it on their top of the line HF2500DX, 3 hole, (I have two of them I will sell you)and it is a disaster... There was a world class contest group that bought 12 of these $5000 amps and all 12 of them have the 80/40 toroid burned out...
If you are going to build a world class amp then do it right and use separate toroids for each of the lower bands...


denny / k8do


--- On Mon, 8/2/10, Hsu <hsu4qro at gmail.com> wrote:

> From: Hsu <hsu4qro at gmail.com>
> Subject: Re: [Amps] New HF amplifier
> To: "Dennis OConnor" <ad4hk2004 at yahoo.com>
> Cc: amps at contesting.com
> Date: Monday, August 2, 2010, 12:12 PM
> It seems any thing what made in China
> should be cheap.But YOU WRONG!
> About this amplifier, although I'm not desigener,but one of
> my best friend is one of designer ( write 
> firmware for this project),he told me the builder
>  use best quality device and BEST transformer in this
> amplifier!
>  An another example, he use best quality LED bar graph, the
> value is $25/ea!but almost same LED bar graph model what
> made in China 
>  only $1.5! I bet this LED bar what value $1.5 almost
> same quality with $25/ea.
> 73!Hsu
> 
> ----- Original Message ----- 
> From: "Dennis OConnor" <ad4hk2004 at yahoo.com>
> To: <amps at contesting.com>
> Sent: Sunday, August 01, 2010 8:01 PM
> Subject: Re: [Amps] New HF amplifier
> 
> 
> > Tapped toroids show that the designer was too cheap to
> do the job right...
> > 
> > Built cheap, for the cheap! Move along folks, nothing
> to see here... Move along... Keep moving...
> > 
> > 
> > denny / k8do
> > 
> > 
> > 
> > 
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