[Amps] Real danger to use the ORANGE button

[K6YE - TOMMY]

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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