[Amps] Real danger to use the ORANGE button

[Jeff AC0C]

As far as I know, the older MP1K's output problems with class A are not 
represented in the 5K series.  Is there data proving the case otherwise?

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: K6YE - TOMMY
Sent: Saturday, May 23, 2015 11:41 PM
To: Charles Henry ; amps at contesting.com
Subject: Re: [Amps] Real danger to use the ORANGE button

Charles, ET AL,

I have run my FTDX-5000MP into an Alpha 91-B, at 35 watts, using Class A for 
years with no problems. Am I missing something or is the problem confined to 
76PA amps.

Semper Fi,

Tommy - K6YE
DX IS and CW RULES


----- Original Message -----
From: Charles Henry <k4vud at hotmail.com>
To: Jeff AC0C <keepwalking188 at ac0c.com>, amps at contesting.com, Contest 
Internet <cq-contest at contesting.com>
Sent: Sun, 24 May 2015 00:17:19 -0400 (EDT)
Subject: [Amps] Real danger to use the ORANGE button

URGENT to all Yaesu radio owners with the orange Class A button.
ABSOLUTELY DO NOT RUN THOSE RADIOS AT LESS THAN FULL POWER OUTPUT SETTING.
I ran a FT-1000Mark 5 into an Alpha 76pac with Class A turned on and at 
about 50 watts of drive.
That adjustment resulted is burning up the Yaesu radio so badly no one could 
fix it;  not even Yaesu England.  Do not run Class A at any setting below 
full RF power with power knob fully clockwise!

The FT-5000/9000 can adjust somewhere between AB and full Class A.  I do not 
know about that situation.

Otherwise, lets hear some crowing about Yaesu Class A transceivers to go 
with the crowing K3 Lovers Club, eh?  73, Charly

> From: keepwalking188 at ac0c.com
> To: k4vud at hotmail.com; amps at contesting.com; cq-contest at contesting.com
> Subject: Re: [Amps] Why not use the ORANGE button?
> Date: Sat, 23 May 2015 21:34:34 -0500
>
> In class A, the 3rd harmonic content is somewhat less, and the higher 
> order
> products are way down.  Without that feature enabled (the usual AB), the 
> 3rd
> is stronger and all of the usual higher order products are present and
> strong.  I normally drive my Alpha 76PA with the 5K in class A at about 
> 60W.
> The output signal is nice and crisp with that combo.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message----- 
> From: Charles Henry
> Sent: Saturday, May 23, 2015 8:37 PM
> To: amps at contesting.com ; Contest Internet
> Subject: [Amps] Why not use the ORANGE button?
>
> I see extoling comments re K3 clean xmitter.  What about the Yaesu
> transceivers with the ORANGE button (some call it red)?  Any Yaesu owner 
> has
> stepped up to the plate and said he just uses his orange button on (ALWAYS
> at full power, max RF power knob fully clockwise).... and explains and
> extolls that strategy to put out cleaner signals???
>
> Someone, please just state how much the orange button Yaesu-s help,
> preferably compared to the K3.
> Thanks mucho,
> 73, Charly
>
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