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[Amps] FL2100Z Low power on 160meter band

Subject: [Amps] FL2100Z Low power on 160meter band
From: "Kees - pa7two" <>
Date: Wed, 4 Oct 2006 11:04:30 +0000
List-post: <>
Hi all, 

Rebuilding my Yaesu FL2100Z which burned-out almost completely by a previous 
owner, I have the unit up & running after noumerous repairs. From bandwafer 
switch till the majority of the CAPs and build-in all the modifications as 
listed on the Internet. On the bandwaferswitch the 160 meterband contacts were 
burned out!

Now, I am facing a 450 watts output only on 160meterband while all other bands 
do at least 550. 
I also see some red coloring happen on the (Chinese brand) 572b tubes by full 
I replaced C35 from the fitted 365pf to a newly fitted 320 pf. (Note: C35 is in 
the schematic 250pf !?!?) 
Now I have a PLATE setting of 6 and a LOAD setting of 3 on 160m using a 1000 
watt spinner dummyload 50ohm. (Before I swapped the C35 I had a PLATE setting 
of more than 10 and LOAD of 8)

Who can indictate to me were to look? the lower output absolutely 
normal on the Yaesu FL2100Z amplifiers? I would expect a higher output compared 
to the higher frequencies?

Vy 73, de Kees   pa7two at amsat . org

>From 'This Book Will Save Your Life' by A.M. Homes:
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"And what's that, Morse code? Is that something I should know?"
"Yes," Richard says.
Cop: "Some kind of high-tech Internet talk?"

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