[Amps] FL2100Z mods & tips wanted

[Kees - pa7two]

Hi Peter, 

I have seen your fine works, but there are so many fl2100's around working just fine with 572b Tubes. The ones I have are new Chinese brand and perform flawlessly in a FL2100B amp of my friend. 

The FL2100Z version has, compared to the B version, the TC2 cap for neutralization. When TC2 is removed amp is fully stable, and easy to tune and full output (500-550 watts on bird powermeter on all bands).
 
However, with a really bad SWR of above 1:2.5 or even worse. Sure some one did the same mod and can give me hints and tricks. Perhaps the TC2 has to return back in the amp with another type of mod? A PROPER guide how to tune the TC2 would also be very welcome. I used the lowest input SWR (= most output, due to best matching of input ciruit) as guidance during tuning?

Vy 73, de Kees



----------------------------------------
> From: peter at frenning.dk
> To: pa7two at hotmail.com
> Subject: Re: [Amps] FL2100Z mods & tips wanted
> Date: Sat, 30 Dec 2006 19:44:36 +0100
> 
> Take a look at my homepage Kees, I've done a major rebuild/mod on the 
> predessessor FL2000B
> 
> Vy 73 de OZ1PIF, Peter
> 
> ** CW: Who? Me? You must be joking!! **
> email: peter(no-spam-filler)@frenning.dk
> http://frenning.dk
> Ph. +45 4619 3239
> Snailmail:
> Peter Frenning
> Ternevej 23
> DK-4130 Viby Sj.
> Denmark
> ***********************************
> ----- Original Message ----- 
> From: "Kees - pa7two" <pa7two at hotmail.com>
> To: <amps at contesting.com>
> Sent: Saturday, December 30, 2006 7:00 PM
> Subject: [Amps] FL2100Z mods & tips wanted
> 
> 
> >
> > Hi all AMPers,
> >
> > I have a Yaesu FL2100z, which when it arrived at my house was burned-out 
> > in several components. I was lucky enough to find all the replacements 
> > parts by the help of Yaesu Europe and Yaesu USA.
> >
> > I also fitted the amp with new Chinese tubes, 572B type. I observed that 
> > after a tune up that the grid resistors and anode fuse (630ma) blew up. 
> > Reading the internetpages, I read that the TC2, the neutraliszation cap, 
> > could be the cullprit in this design, making the amp unstable. So I 
> > removed this TC2 and indeed the amp is steady now, no more surprises.
> >
> > However, I observe a very bad input SWR on all bands after the removal of 
> > TC2. Now my question is, who did the same mod as me, removing the TC2 cap, 
> > and reworked in the input circuits? Who can give me some hints & tricks to 
> > get this amp up and running with a (much) better SWR?
> >
> >
> > Vy 73, de Kees
> >
> > LetYourFingersTalk!
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